WO2005071858A1 - 情報伝送方式、電子装置および無線通信端末 - Google Patents
情報伝送方式、電子装置および無線通信端末 Download PDFInfo
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- WO2005071858A1 WO2005071858A1 PCT/JP2005/001449 JP2005001449W WO2005071858A1 WO 2005071858 A1 WO2005071858 A1 WO 2005071858A1 JP 2005001449 W JP2005001449 W JP 2005001449W WO 2005071858 A1 WO2005071858 A1 WO 2005071858A1
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
- G09G5/006—Details of the interface to the display terminal
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/0206—Portable telephones comprising a plurality of mechanically joined movable body parts, e.g. hinged housings
Definitions
- the present invention relates to an information transmission method, an electronic device, and a wireless communication terminal incorporating an element that requires i-speed data transfer, such as a display element or an imaging element.
- FIG. 40 is a block diagram showing a typical configuration of an electronic device using an active matrix liquid crystal display as a display element
- FIG. 41 is a time chart thereof.
- the CPU 5701 generates image data to be displayed, and writes the image data to the video memory 5702.
- the CPU 5701 generates image data to be displayed by decompressing or calculating a compressed image or moving image data in the JPEG format or the MPEG format.
- the liquid crystal controller 570 3 sets various timings necessary for liquid crystal display, that is, the X clock signal 5 7 15 of the X driver 5 7 13, the horizontal synchronizing signal 5 7 14, the vertical synchronizing signal 5 7 18
- the image data is read out from the video memory 570 in the order in which it should be displayed, and the driver of the liquid crystal display 570 (X driver 571 3 and Y driver 570 7 ).
- the X driver 571 3 has an m-stage shift register 570 4, an m-word latch 570 5, and the like. And m DA converters 5760.
- the liquid crystal controller 5703 When reading the first pixel of the display frame, the liquid crystal controller 5703 generates a vertical synchronizing signal 5718 and sends it to the Y driver 570. At this time, the LCD controller The roller 5703 reads out the data to be displayed on the pixel in the first row and the first column of the liquid crystal display 5708 from the video memory 5702 and sends it to the data terminal of the latch 5705 as a display data signal 5716.
- the shift register 5704 reads the horizontal synchronization signal 5714 generated by the liquid crystal controller 5703 in synchronization with the X clock signal 5715, and latches the image data in the first column.
- Signal X1 latch Figure 41 (c)
- the liquid crystal controller 5703 reads and outputs data to be displayed in the next pixel from the video memory 5702.
- the shift register 5 704 of the X driver 5 7 13 shifts the horizontal synchronization signal 5 714 by one, and generates a signal X 2 latch (FIG.
- the DA converter 5706 outputs the data, and the data held in the latch 5705 is DA-converted and output to the X i-th (l ⁇ i ⁇ m) of the column electrode 5710.
- the Y driver 5707 outputs a selection signal to the first row electrode Y1.
- the Y driver 5707 shifts the selection signal output at the Y j-th (1 ⁇ j ⁇ n) of the row electrode 7509 by the I ⁇ th order every time the horizontal synchronization signal 5714 is output.
- the one-dot chain line 57718 in FIG. 40 is an enlarged view of one pixel portion of the liquid crystal display 5708 in a matrix arrangement.
- the active switch element 5 7 1 1 outputs the output of the DA converter 5 706 output at the X i-th of the column electrode 5 7 10 to the pixel electrode 5 7 1 Tell 2
- the latch 5705 becomes an analog sample and hold circuit. This method can reduce the number of DA converters and has been widely used in the past.
- the voltage value finally applied to the pixel electrode 5712 should be a predetermined value.
- FIG. 41 illustrates a case where a horizontal retrace period for one pixel and a vertical retrace period for one row are taken.
- liquid crystal display In electronic devices that use an image sensor such as a digital camera, the liquid crystal display
- the direction of signal transmission is opposite to that of the 5708, and the same circuit configuration is adopted.
- large displays, high resolution, and equipment Are required to be smaller and lighter.
- mounting boards on which the electronic device of FIG. 40 is mounted and in such a case, the mounting boards are often separated by the dashed line 5 7-1 7 -5 7 17 ′ in FIG.
- connection between the CPU 5701 and the liquid crystal display 5708 becomes longer. Also, when the image sensor is mounted in the configuration of FIG. 40, the signal transmission direction is reversed as compared with the case where the liquid crystal display 5708 is used, and the same circuit configuration is adopted. The connection between the child becomes longer.
- Non-Patent Document 1 reports a study on wireless connection between chips. .
- Patent Document 1 Patent Publication 3 0 8 6 4 5 6 (Column 4 4)
- Patent Document 2 Patent Publication 3 3 3 0 3 5 9 (Columns 4 6)
- Patent 'Reference 3 Patent publication 3 3 4 9 4 2 6
- Patent document 4 Patent publication 3 3 4 9 4 9 0
- Non-Patent Document 1 “Nikkei Micro Device”, January 2003, February issue, page 16 1 Disclosure of Invention
- the mounting substrates are separated by the dashed line 5 717-5 717 ′ shown in FIG. 40, it is necessary to transmit a large amount of data at high speed through a line routed by a long wiring. For this reason, the radiated electromagnetic field from the line increases, which causes electromagnetic interference with other electronic devices or own equipment.
- the amplitude level at the receiving end is specified, and even if sufficient quality is ensured at the receiving end, the signal amplitude level can be reduced. Absent. In other words, EMI countermeasures have become more difficult, resulting in restrictions on equipment design and increased costs.
- the stray capacitance of the line is also driven in addition to the load on the receiving end, so extra energy is required for signal transmission. That is, the power consumption is increased.
- the number of signals exchanged via the hinge part is several tens, and the wiring on the board cannot be used.
- the boards will be connected via connectors.
- the connection using a flexible substrate or a connector has the disadvantages of high cost and low connection reliability.
- information transmission by the conventional wireless communication technology has a problem in safety because the electromagnetic wave signal used for communication leaks even in the same electronic device. That is, there was a problem that communication security was threatened by eavesdropping.
- the present invention provides a method of high-speed transmission of data having various problems and limitations as described above, by improving the conventional wireless communication technology and applying it to data transmission in the same electronic device.
- the first object is to realize a low-cost and highly-reliable electronic device and wireless communication terminal by eliminating the disadvantages and restrictions of the conventional information transmission system by making the system wireless.
- the present invention solves the problem of security when removing various problems and restrictions related to the conventional information transmission in the same electronic device by applying wireless communication technology.
- the second objective is to eliminate the drawbacks and limitations of, and to realize a low-cost and highly reliable electronic device and wireless communication terminal.
- the information transmission method of the present invention includes a wireless communication device for transmitting first category information, and a wired communication means for transmitting second category information, wherein the wireless communication of the first category information and the second category are performed.
- the wired communication of one information is performed within one communication link.
- one communication link refers to a period during which communication is performed without interruption. Within one communication link, transmission and reception are performed in at least 10 pairs.
- the electronic device of the present invention includes a wireless communication unit that wirelessly communicates the first category information, and a wired communication unit that wirelessly communicates the second category information, and performs the wireless communication of the first category information and the second category information.
- the 'wired communication of information' is performed within one communication link. According to the above configuration, since various problems associated with information transmission in the electronic device can be eliminated by the information transmission, the electronic device can be easily realized.
- An electronic apparatus according to the present invention includes a wireless communication unit that wirelessly communicates first category information, and a wired communication unit that performs wired communication of second category one information used for controlling or processing the first category information. Characterized in that
- the first category information can be transmitted by wireless communication while reducing the load on wireless communication. It becomes possible to send.
- problems associated with wireless communication such as deterioration of security and an increase in circuit scale
- problems associated with wired communication such as an increase in the number of wires and restrictions on component arrangement. It is possible to respond to the miniaturization and miniaturization of electronic devices while responding to larger screens and more functions.
- the electronic device is an information transmission unit that transmits first category information, an encryption unit that encrypts the first category one information of the information transmission unit, and an encryption unit that is encrypted by the encryption unit.
- a wireless transmission unit that transmits the first category one information by an electromagnetic wave signal, a wireless reception unit that receives the electromagnetic wave signal transmitted by the wireless transmission unit, and a decoding unit that decodes the signal received by the wireless reception unit.
- a key generation unit that generates an encryption key as second category information; and a wired communication unit that distributes the symbol key generated by the key generation unit to the encryption unit and the decryption unit by wired communication.
- An electronic device includes: an information transmission unit that transmits first category information; a random number generation unit that generates a random number as second category information; and a wired line that distributes the random number generated by the random number generation unit by wired communication.
- a communication unit; an addition unit that adds the random number to the first category information transmitted by the information transmission unit; a wireless transmission unit that transmits the information added by the addition unit by an electromagnetic wave signal; and the wireless transmission A radio receiving unit that receives the electromagnetic wave signal transmitted from the unit, and a subtracting unit that subtracts and decodes the random number from information received by the wireless communication unit.
- the information exchanged wirelessly in the electronic device is added to the random number, even if the information is leaked, a third party cannot know the content and security is ensured. Since the random numbers can be changed frequently and transmitted to the receiving side via wired communication, the added random numbers are not stolen by a third party.
- An electronic device includes: an information transmitting unit that transmits first category information; a spread code generation unit that generates ⁇ as second category information, a wired communication unit that distributes the spread code generated by the spread code generation unit by wired communication, and a first category information transmitted by the information transmission unit.
- a modulating unit that performs spread modulation by the spreading code, a radio transmitting unit that transmits information modulated by the modulating unit by electromagnetic waves, a radio receiving unit that receives the electromagnetic wave signal, and a radio receiving unit that receives the information.
- a demodulation unit for despreading the obtained information by the spreading code.
- the wired communication unit of the electronic device according to the present invention is characterized in that communication is performed by superimposing a signal on a power supply line.
- the wired communication unit performs communication using a signal superimposed on the power supply line, there is no need for special wiring for the communication, and a large amount of data can be easily transmitted with an extremely small number of wires. It becomes possible.
- the electronic device includes: an electromagnetic wave conversion unit that converts the first category information into an electromagnetic wave signal; and an electromagnetic wave restoration unit that receives the electromagnetic wave signal and restores the first category information.
- wireless communication using electromagnetic waves (radio waves) for signal transmission can be achieved with a simple configuration.
- the transmission side and the reception side where signals are transmitted wirelessly use a common control signal transmitted by wire, variations in characteristics and timing at the transmission and reception ends can be absorbed, and high precision High quality communication can be ensured without using components.
- the electromagnetic wave conversion unit and the electromagnetic wave restoration unit are driven by a carrier wave generated by the same carrier wave oscillator.
- both the transmitting side and the receiving side where the signal is transmitted wirelessly are driven by the carrier generated by the common signal transmitted by wire, the synchronization of the synchronous detection is performed on the receiving side. No need to take. As a result, there is no need to use high-precision With a simple circuit configuration, it is possible to ensure high-quality communication.
- the electromagnetic wave conversion unit of the electronic device of the present invention performs spectrum spread modulation, the electromagnetic wave restoration unit performs spectrum despreading, and synchronization information of the electromagnetic wave conversion unit and the electromagnetic wave restoration unit is transmitted by wire. It is characterized by being performed.
- a plurality of signals can be multiplexed and transmitted without being serialized by spread spectrum modulation, and real-time characteristics are good. Also, since a spreading gain can be gained, a robust system can be constructed in which the transmitted electromagnetic wave signal does not interfere with the system or the interference received from the system is small. Furthermore, since synchronization information is transmitted by wire at the transmitting and receiving ends, a synchronizing circuit for acquiring synchronization from the received electromagnetic wave signal is not required at the receiving end, and a simple despreading circuit can be used, which simplifies the circuit. It is.
- the electromagnetic wave conversion unit of the electronic device of the present invention modulates a UWB signal
- the electromagnetic wave restoration unit demodulates from a UWB signal
- the synchronization information of the electromagnetic wave conversion unit and the electromagnetic wave restoration unit is wired. It is characterized by being transmitted.
- An electronic device includes a wireless transmission unit that modulates first category information and transmits the same as an electromagnetic wave signal, a wireless reception unit that receives and demodulates the electromagnetic wave signal, and superimposes and transmits the second category information on a power line.
- the first category-one information and the second category-one information are included in one communication link by the wireless transmitting unit and the wired transmitting unit.
- the wireless transmission unit and the wireless reception unit are supplied with power from a common power supply line.
- the wireless transmitter of the electronic device includes: a controller that generates a reference signal; and a modulator that converts the first category information into an electromagnetic wave signal in synchronization with the reference signal.
- the second category-one information transmitted and received by the wired receiver is the reference signal, and the wireless receiver demodulates the first category information in synchronization with the reference signal received by the wired receiver.
- a demodulator is provided.
- the wireless transmission unit and the wireless reception unit can operate in synchronization with the same reference signal, a circuit for synchronization is not required on the receiving side, and the first category information is transmitted and received.
- Hardware configuration can be significantly simplified.
- the wireless transmission unit of the electronic device includes a control unit that oscillates a reference signal, a first carrier oscillation unit that oscillates a carrier wave synchronized with the reference signal, and a carrier wave that the carrier oscillation unit emits.
- a modulation unit that converts the signal into an electromagnetic wave signal, wherein the second category-one information transmitted and received by the wired transmitting unit and the wired receiving unit is the reference signal, and the wireless receiving unit includes the wired receiving unit.
- a second carrier oscillation unit that oscillates a carrier wave synchronized with the reference signal received by the unit, and a demodulation unit that demodulates the first category information using the carrier wave emitted by the second carrier oscillation unit.
- the radio transmitting unit and the radio receiving unit can operate by using a carrier wave generated in synchronization with the same reference signal, so that synchronization acquisition and tracking for carrier wave reproduction on the receiving side can be performed.
- No circuit is required, and hardware for transmitting and receiving the first category information Can be significantly simplified.
- the wireless transmission unit of the electronic device includes a control unit that oscillates a reference signal, a first carrier oscillation unit that oscillates a carrier wave synchronized with the reference signal, and a carrier wave that the carrier oscillation unit emits.
- a modulation unit that modulates and converts the signal into an electromagnetic wave signal, wherein the second category information transmitted and received by the wired transmission unit and the wired reception unit is the reference signal;
- a receiving unit configured to oscillate a carrier wave synchronized with the reference signal received by the wired receiving unit, and receive the first category-one information by wire using the carrier wave generated by the second carrier oscillating unit;
- a demodulation unit that demodulates in synchronization with the reference signal received by the unit.
- the radio transmission unit and the radio reception unit can be synchronized with one reference signal superimposed on the power supply line, and operate with a tracked carrier wave generated in synchronization with the reference signal.
- the wireless transmitter of the electronic device of the present invention modulates the first category information by phase modulation, generates carrier information for modulation and demodulation from a reference signal transmitted by wire as second category information, and transmits the generated information by the wireless transmitter.
- the transmitted packet is synchronized with a reference signal transmitted as a wire as the second category information.
- the wireless transmission unit and the wireless reception unit that transmit and receive the first category information can be realized with a simple circuit configuration, and the signal transmission can be made wireless using electromagnetic waves (radio waves).
- the transmission side and the reception side, where signals are transmitted wirelessly use a common control signal that is superimposed on the power supply line and transmitted, so that variations in characteristics and timing at the transmission and reception ends can be absorbed. High quality communication can be ensured without using high precision parts.
- the radio transmitting unit of the electronic device of the present invention modulates the first category one information by spread spectrum modulation, and the radio receiving unit demodulates and demodulates the first category information by spectrum despreading. It is characterized by generating and synchronizing code synchronization information or carrier wave information as second category information from a reference signal transmitted by wire.
- a plurality of signals can be multiplexed and transmitted without being serialized by spread spectrum modulation, and real-time characteristics are good. You can also gain spreading gain Therefore, it is possible to construct a mouth-paste system with less interference from the transmitted electromagnetic wave signal to the system or less interference from the system.
- synchronization information or carrier wave information is superimposed on the power supply line and transmitted. Therefore, at the receiving end, the signal can be used to reproduce the synchronization timing—the carrier wave.
- the carrier can be reproduced by a simple circuit, and the circuit can be simplified.
- the second category information is superimposed on the power supply line, the number of wires can be minimized.
- the wireless transmitter of the electronic device of the present invention modulates the first category information by UWB modulation, and generates synchronization information of a pulse template for demodulation from the reference signal transmitted as the second category information. It is characterized by synchronization.
- the second category information of the electronic device according to the present invention is characterized in that the second category information includes synchronization information or carrier wave information relating to the wireless communication of the first category information.
- the circuit for wireless transmission in wireless transmission, a procedure and a circuit for synchronization acquisition on the receiving side are omitted, and the circuit for wireless transmission can be simplified.
- the carrier wave on the transmitting side and the receiving side can always be tracked, so that the accuracy of the carrier oscillator can be remarkably reduced, and the accuracy of the hardware for transmitting and receiving the first category information can be significantly improved. Can be eased, and cost merit is large.
- the second category-one information of the electronic device of the present invention includes information indicating a reception state of the first category-one information, and is transmitted from a receiving side of the first category-one information to a transmitting side.
- the reception status can be easily fed-packed from the reception side to the transmission side based on the reception status of the information transmitted by radio, and the reception quality can be easily ensured.
- the first category Since the transmission power can be controlled to the minimum required to receive the information, EMI countermeasures can be facilitated and the security against information leakage can be ensured.
- the electronic device of the present invention is characterized in that the first category information includes any of image data, text data, and audio data.
- the electronic device of the present invention includes: a storage unit that stores the first category information; a display that displays the first category information; and a first category that is stored in the storage unit in accordance with a driving order of the display.
- a display controller that reads and outputs one piece of information; and a display driver that drives the display based on the first category information read by the display controller.
- An electronic device includes an image sensor, and image capturing control means for reading and outputting an image signal captured by the image sensor as the first category information.
- the exchange of signals between the image sensor and the host using image data obtained by the image sensor is made wireless, so that wiring between them is not necessary, and the image sensor is exposed as the image sensor becomes larger.
- Various problems can be avoided. In other words, it can be easily mounted even in a clamshell-structured housing, eliminating the need for wiring with a flexible board or connector, eliminating the cost and reliability problems caused by these, and supporting high transmission speeds.
- the above configuration of the present invention eased the restrictions. You can.
- the electronic device of the present invention is characterized in that information transmitted between an electronic circuit on an integrated circuit and the outside of the integrated circuit is wirelessly transmitted as first category information.
- An electronic device includes: a display unit; a speaker unit; and a data source unit that generates image data to be displayed on the display unit and acoustic data for driving the speed force unit. Wherein the image data and the sound data transmitted between the unit and the data source unit are wirelessly transmitted as first category information.
- a wireless communication terminal includes a first housing, a second housing connected to the first housing, and a first housing and a second housing.
- a connecting portion that connects the first housing portion and the second housing portion so that a positional relationship can be changed; and an external wireless communication antenna mounted on the first housing portion or the second housing portion.
- An external wireless communication control unit mounted on the first housing unit and mainly controlling external wireless communication performed via the external wireless communication antenna; and a display unit mounted on the second housing unit A first internal wireless communication antenna mounted on the first housing portion; a second internal wireless communication antenna mounted on the second housing portion; A first internal wireless communication control which is mounted and controls internal wireless communication performed via the first internal wireless communication antenna; A second internal wireless communication control unit mounted on the second housing unit and configured to control internal wireless communication performed via the second internal wireless communication antenna; and the first housing. And a wired communication unit mounted on the unit or the second housing unit and exchanging part of the information sent by the internal wireless communication by wire.
- FIG. 1 is a perspective view showing a state when a clamshell-type mobile phone to which the wireless communication control method of the present invention is applied is opened. .
- FIG. 2 is a perspective view showing a state in which a clamshell type mobile phone to which the wireless communication control method of the present invention is applied is closed.
- FIG. 3 is a perspective view showing the appearance of a rotary mobile phone to which the wireless communication control method of the present invention is applied.
- FIG. 4 is a block diagram showing a main part of one embodiment of the present invention.
- FIG. 5 is a sectional view showing an embodiment of the electronic device of the present invention.
- FIG. 6 is a block diagram showing an embodiment of an electronic device using the information transmission method of the present invention.
- FIG. 7 is a block diagram showing another embodiment and an example of an electronic device using the information transmission method of the present invention.
- FIG. 8 is a block diagram illustrating the modulator and demodulator of the electronic device according to the fifth and sixth embodiments of the present invention in more detail.
- Figure 9 Time charts detailing Embodiments 7 and 8 according to the present invention.
- FIG. 10 is a block diagram of a main part of an embodiment of another electronic device according to the present invention.
- FIG. 11 is a block diagram showing a main part of still another embodiment of the electronic device according to the present invention.
- FIG. 12 is a block diagram showing a main part of still another embodiment of the electronic device according to the present invention.
- FIG. 13 is a block diagram showing a main part of still another embodiment of the electronic device according to the present invention.
- FIG. 14 is a block diagram showing a main part of still another embodiment of the electronic device according to the present invention.
- FIG. 15 is a block diagram showing a main part of still another embodiment of the electronic device according to the present invention.
- FIG. 16 is a sectional view showing still another embodiment of the electronic device of the present invention.
- FIG. 17 is a block diagram showing still another embodiment of the electronic device according to the present invention.
- FIG. 18 is a block diagram illustrating in more detail the modulator and the demodulator of Embodiment 16 of the electronic device according to the present invention.
- FIG. 19 is a block diagram showing a main part of still another embodiment of the electronic device according to the present invention.
- FIG. 20 is a block diagram showing a main part of still another embodiment of the electronic device according to the present invention.
- FIG. 21 is a block diagram showing a main part of still another embodiment of the electronic device according to the present invention.
- FIG. 22 is a block diagram of another embodiment of the superposition circuit and the separation circuit of the electronic device according to the present invention.
- FIG. 23 is a block diagram showing a main part of still another embodiment of the electronic device according to the present invention.
- FIG. 24 ′ Block diagram showing a main part of still another embodiment of the electronic device according to the present invention.
- Figure 2.5 Block diagram showing still another embodiment of the electronic device of the present invention.
- FIG. 26 is a block diagram showing still another embodiment of the electronic device S of the present invention.
- FIG. 27- Block diagram showing still another embodiment of the electronic device of the present invention.
- FIG. 28 is a block diagram showing still another embodiment of the electronic device according to the present invention.
- FIG. 29 is a block diagram showing still another embodiment of the electronic device of the present invention.
- FIG. 30 is a block diagram showing still another embodiment of the electronic device of the present invention.
- FIG. 31 is a block diagram showing still another embodiment of the electronic device of the present invention.
- Figure 32 Diagram showing an embodiment of the timing of wired communication and wireless communication.
- FIG. 33 Diagram showing another embodiment of the timing of wired communication and wireless communication.
- FIG. 34 Diagram showing still another embodiment of the timing of wired communication and wireless communication.
- FIG. 35 Diagram showing still another embodiment of the timing of wired communication and wireless communication.
- FIG. 36 Diagram showing still another example of the timing of wired communication and wireless communication.
- FIG. 37 Diagram showing still another example of the timing of wired communication and wireless communication.
- FIG. 38 Diagram showing still another embodiment of the timing of wired communication and wireless communication.
- FIG. 39 Diagram showing still another embodiment of the timing of wired communication and wireless communication.
- FIG. 40 is a block diagram illustrating an electronic device having a conventional liquid crystal display.
- Figure 41 Time chart explaining the operation of an electronic device with a conventional liquid crystal display. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 shows that a Gram-Shell type mobile phone to which the wireless communication control method of the present invention is applied is opened.
- FIG. 2 is a perspective view showing a state in which the clamshell-type mobile phone to which the wireless communication control method of the present invention is applied is closed.
- an operation button 4 is arranged on the surface of the first housing 1, and a microphone 5 is provided at a lower end of the first housing 1.
- An external wireless communication antenna 6 is attached to the upper end of the unit 1.
- a display 8 is provided on the surface of the second housing 2, and a speaker 9 is provided on the upper end of the second housing 2.
- a display body 11 and an image sensor 12 are provided on the back surface of the second housing section 2.
- the display bodies 8 and 11 for example, a liquid crystal display panel, an organic EL panel, a plasma display panel, or the like can be used.
- the image pickup device 12 a CCD or CMOS sensor or the like can be used.
- the first housing 1 and the second housing 2 are provided with internal wireless communication antennas 7, 10 for performing internal wireless communication between the first housing 1 and the second housing 2. Each is provided.
- the first housing part 1 and the second housing part 2 are connected via a hinge 3, and the second housing part 2 is rotated by the hinge 3 as a fulcrum. It can be folded on the housing 1. Then, by closing the second housing part 2 on the first housing part 1, the operation button 4 can be protected by the second housing part 2, and the operation button 4 is held when carrying the mobile phone. It is possible to prevent erroneous operation.
- the user can view the display 8, operate the operation buttons 4, talk using the speaker 9 and the microphone 5, and operate the operation button. You can take pictures while operating 4.
- the display body 8 can be arranged on almost the entire surface of the second housing part 2, and the size of the display body 8 can be increased without impairing the portability of the mobile phone. It is possible to improve visibility.
- the internal wireless communication using the internal wireless communication antennas 7, 10 is performed.
- Data transmission between the first housing 1 and the second housing 2 can be performed.
- image data and audio data captured in the first housing unit 1 via the external wireless communication antenna 6 are transferred to the second housing unit by internal wireless communication using the wireless communication antennas 7 and 10. 2 to display an image on the display 8 or output sound from the speaker 9.
- Image data captured by the image sensor 12 is sent from the second housing unit 2 to the first housing unit 1 by internal wireless communication using the internal wireless communication antennas 7 and 10, and external wireless communication is performed. Can be transmitted to the outside via the antenna 6 for communication.
- the mobile phone can have a large screen and multiple functions without impairing the portability of the mobile phone.
- the external wireless communication antenna 6 is mounted on the first housing 1, it may be mounted on the second housing 2. In this case, the external wireless communication antenna 6 is not obstructed by the second housing portion 2 during use, and more efficient communication can be expected. In this case, power is supplied to the external wireless communication antenna 6 by a coaxial cable or the like from the communication control unit of the mobile phone built in the first housing unit 1.
- the second category one used for controlling or processing the first category one information transmitted by the internal wireless communication Information may be exchanged between the first housing 1 and the second housing 2 by wire.
- FIG. 3 is a perspective view showing the appearance of a rotary mobile phone to which the wireless communication control method of the present invention is applied.
- operation buttons 24 are arranged on the surface of the first housing 21, and a microphone 25 is provided at the lower end of the first housing 21, and An antenna 26 for external wireless communication is attached to the upper end of 21.
- a display 28 is provided on the surface of the second housing 22, and a speaker 29 is provided at an upper end of the second housing 22.
- the first housing 21 and the second housing 22 include an internal wireless communication antenna 2 for performing internal wireless communication between the first housing 21 and the second housing 22. 7, 30 are provided respectively Reply
- the first housing part 21 and the second housing part 22 are connected via a hinge 23, and the second housing part 22 is horizontally rotated around the hinge 23 as a fulcrum.
- the second housing part 22 can be arranged so as to overlap the first housing part 21, or the second housing part 22 can be shifted from the first housing part 21.
- the operation buttons 24 can be protected by the second housing part 22. It is possible to prevent the operation buttons 24 from being operated when the user carries the device.
- the operation buttons 2 are displayed while looking at the display body 28. 4 and talk while using the speaker 29 and the microphone 25.
- the internal wireless communication antennas 27 and 30 were used by providing the internal wireless communication antennas 27 and 30 in the first housing 21 and the second housing 22 respectively.
- Data transmission between the first housing part 21 and the second housing part 22 can be performed by internal wireless communication.
- the image data and the audio data taken into the first housing unit 21 via the external wireless communication antenna 26 are transmitted by the internal wireless communication using the internal wireless communication antennas 27 and 30.
- the image can be sent to the housing unit 22 to display an image on the display unit 28 or output sound from the speaker 29. .
- the second category used for controlling or processing the first category-one information transmitted by the internal wireless communication Information may be exchanged between the first casing 21 and the second casing 22 by wire.
- the complexity of the system due to the linearization can be avoided.
- FIG. 4 is a conceptual diagram showing a main part of an embodiment of the information transmission system according to the present invention.
- a transmission block 111 and a reception block 113 are provided, and data is transmitted from the transmission block 112 to the reception block 113.
- a circuit block 101 having transmission information is provided in the transmitting block 111, and a circuit element 104 receiving the transmitting information is provided in the receiving block 113.
- the transmitter block 112 and the receiver block 113 are provided with interface circuits 103 and 105 for communicating with each other via a wired path 107, respectively.
- a transmission antenna 110 and a reception antenna 111, which communicate with each other via a communication, are provided.
- the transmission information generated by the circuit element 101 is classified into first category information and second category information, and the first category information is modulated by the modulator 102 and transmitted as electromagnetic waves from the transmission antenna 110. Is done.
- the second category information is transmitted via the interface circuit 103 via the wired route 107.
- the electromagnetic wave signal which is emitted from the transmitting antenna 110 and carries the first category of information, propagated in the space (wireless propagation path 108) is received by the receiving antenna 111, demodulated by the demodulator 106, and the circuit element 104 Output to Further, the second category information transmitted on the wired path 107 is transmitted to the circuit element 104 via the interface circuit 105.
- the second category information may be transmitted from the receiving block 111 to the transmitting block 112, in which case the second category information is transmitted from the interface circuit 105 to the interface circuit 103.
- the first category information high-speed data that is difficult to transmit by wire or parallel data that requires multiplexing such as bus lines are selected.
- Information belonging to the first category is transmitted wirelessly.
- the electromagnetic field radiated from the transmitting antenna 110 is set so as not to exceed the upper limit prescribed by law. Although the radiation level allowed as an unlicensed radio station is much lower than the EMI regulations, since the communication distance is very short, sufficient quality communication can be achieved by setting the link budget appropriately. The road can be secured. JP2005 / 001449
- the wireless communication method used in the present invention since the communication distance is limited to the same case or the same system, a method simpler than the technology used for the conventional wireless communication device can be adopted.
- This method is realized by the second category information transmitted by wire.
- the second category information include information that does not require high-speed large-volume data transfer, synchronization information for wireless transmission and reception, oscillator information, and feed pack information that feeds data reception status.
- the synchronization information of the communication packet is transmitted by wire, a circuit for extracting the synchronization information on the receiving side becomes unnecessary, and the circuit on the receiving side can be significantly simplified.
- the structure of the correlator can be significantly simplified.
- oscillator information can be transmitted, a common clock signal can be used as a reference between transmission and reception, and the required oscillation frequency accuracy of the oscillator will be remarkably relaxed, facilitating the realization of electronic devices.
- the electromagnetic waves transmitting the first category information may interfere with the original communication of the electronic device.
- the first category information is transmitted by exchanging the operating status of the electronic device between the transmission and reception of the first category one information as the second category one information so as not to interfere with the radio waves used by the electronic device By changing the frequency and transmission power of electromagnetic waves, Can be prevented from interfering with other communication. That is, the frequency of the transmission channel is selected as the second category information for mobile phones and the like, and the hopping pattern is selected for pull-tooth and UWB. 'The second category-one information may be sent from the receiving side of the first category-one information to the transmitting side.
- the reception status of the first category information is fed back, and the reception side sends a request for retransmission, a request to increase or decrease the radiated electromagnetic energy, a pre-emphasis parameter to improve the distortion of the transmission path, etc. It can be sent to the transmitting side to improve communication quality with low hardware costs.
- the electromagnetic wave energy can be set to the maximum level that can ensure communication quality on the receiving side, and unnecessary radiation can be reduced. This is the signal level at the receiving end, which is lower than the unnecessary radiated electromagnetic field energy of conventional wired high-speed data transmission, which is driven together with stray capacitance with large energy to secure the specified value. EMI measures are extremely easy.
- FIG. 5 is a diagram showing one embodiment of an electronic device according to the present invention.
- the electronic device is divided into a main body portion 205 and a display portion 209, and is integrated via a hinge 207.
- various input / output devices such as a keyboard / display device are connected to the electronic device. That is, in the main body 205, display data is generated by controlling the main body board 203, which is responsible for controlling the function of the electronic device main body, the keyboard 204, which is an input device, and the electronic circuit on the main body board 203.
- a liquid crystal controller 208 is provided.
- the display unit 209 is provided with a liquid crystal display 206 as a display device. Further, the main body unit 205 and the display unit 209 are provided with a transmission antenna 212 and a reception antenna 210 for performing wireless communication with each other.
- the main unit 205 and the display unit 209 are connected to each other via a line 211 for performing wired communication.
- Display data generated by the liquid crystal controller 208 is first category information.
- the signal is sent to a modulator 200 where it is modulated, converted to an electromagnetic wave (radio wave) by a transmission antenna 2 12 and propagated in the space.
- the electromagnetic wave signal transmitted from the transmitting antenna 2 1 2 is transmitted to the receiving antenna 2 10
- demodulated into display data by the demodulator 202 sent to the liquid crystal driver 201, and displayed on the liquid crystal display 206.
- the synchronization signal of the modulator 200 and the demodulator 202 is transmitted to the demodulator 202 via the line 211 as the second category information.
- This signal is easy to route through hinges because the data rate is not very high and the required number of signal lines is small.
- the degree of freedom in wiring and component placement is also increased, and as shown in Fig. 5, the modulator 200 and transmission antenna 2 12 as the signal transmission unit and the demodulator 200 and reception antenna 210 as the reception unit are connected. It is also possible to place it far from the hinge 207.
- FIG. 6 is a block diagram showing a more detailed configuration of the information transmission system according to the present invention and an embodiment of an electronic device using the same.
- the CPU 301 generates display data to be displayed by calculation or the like, and records the display data in the video memory 302.
- the liquid crystal controller 303 reads out the data 319 to be displayed on the display from the video memory 302 in a predetermined order, and outputs it together with the vertical synchronization signal 321 and the horizontal synchronization signal 322. Since the data to be displayed 319 is usually read out as data from the video memory 302 in a pixel-by-pixel manner in parallel for each code, the data is parallel-converted by the parallel-conversion circuit 304 and the logic circuit 310 is displayed.
- the logic circuit 307 receives the signal output from the parallel / parallel conversion circuit 304, the horizontal synchronizing signal 320 and the vertical synchronizing signal 320 output from the liquid crystal controller 303, and converts the packet. It generates and attaches a preamble to the packet to synchronize necessary for communication such as timing of synchronous detection.
- the packet is modulated by the modulator 308 with the carrier frequency generated by the carrier oscillator 309, and transmitted from the transmission antenna 310 via the final stage circuit 328.
- the output of carrier oscillator 309 Is divided by a frequency divider 326, converted to a lower frequency, and transmitted as one of the second category information to a receiving side via a wired path 340.
- the receiving antenna 311 receives the electromagnetic wave signal transmitted from the transmitting antenna 310. Then, the signal received by the receiving antenna 311 is amplified by the preamplifier 312, the unnecessary band component is removed by the bandpass filter 313, and the signal is input to the demodulator 314. In the demodulator 314, the frequency of the output of the frequency divider 326 sent over the wired path 340 as one of the second category information is multiplied by the PLL 315 to restore the carrier frequency and demodulate. The signal is supplied to the devices 3 and 4 to demodulate the electromagnetic wave signal.
- the synchronization circuit 316 detects a preamble in the received signal packet, and detects a synchronization timing required for demodulation and a synchronization signal for driving the liquid crystal.
- the logic circuit 318 generates the horizontal sync signal 3 2 3, the vertical sync signal 3 2 4, and the X driver transfer clock 3 2 5 from the demodulated packet by adjusting the timing to the display data 3 2 2 in the packet.
- the driver of the liquid crystal display that is, the signal corresponding to the display data signal 57 16, the horizontal synchronization signal 57 14, the vertical synchronization signal 57 18 and the X clock signal 57 15 in FIG. Output to the driver of the liquid crystal display and display.
- the oscillation frequency of the carrier oscillator 309 is selected so as not to disturb the original purpose of an electronic device using radio waves, such as a radio receiver or a mobile phone, and to not interfere with the original purpose. If a frequency of 2 GHz or higher is selected, the occupied band is about 200 MHz, even if data of 100 Mbps is transmitted, and it can be used without any problem in most cases.
- the modulator on the transmitting side 308 and the demodulator on the receiving side 314 must have the same carrier frequency power s—the frequency of the carrier oscillator between transmission and reception must be high. Accuracy is required, and the error between the two directly manifests itself as degradation in communication quality.
- no error occurs because the modulator 308 and the demodulator 314 use the signal of the same carrier oscillator 309 as a reference. The accuracy of the carrier oscillator 309 does not matter, and has a cost reduction effect.
- the divider 3 2 6 and the PLL 3 15 are not essential, and the output of the carrier oscillator 3 09 may be sent directly to the demodulator 3 14, but since the carrier frequency is generally high, the line It is difficult. As in the above configuration, it is more feasible to divide the frequency, transmit the reduced frequency, and multiply by PLL 3, 15 to restore the same carrier as the output of the carrier oscillator 309.
- the evaluation circuit 3 2 7 calculates the reception status from the demodulator 3 14 The results are fed back to the final stage circuit 328 through the wired route 340 as the second category information.
- the final-stage circuit 3288 controls the power supplied to the transmission antenna 310 so that the minimum transmission power at which sufficient communication quality can be ensured on the receiving side of the electromagnetic wave signal. This makes it possible to maintain communication quality with much less radiated power than unnecessary radiated power generated from a conventional wired transmission line, where the received signal level must be maintained at a predetermined value. It becomes a measure. -It is also possible to add pre-emphasis or pre-distortion to the electromagnetic field generated to compensate for the propagation path characteristics of the radiated electromagnetic field using this feed pack information.
- a predetermined communication quality can be obtained with a predetermined radiation electromagnetic field power.
- the transmission power and propagation path characteristics vary greatly depending on the component arrangement, etc., and it was necessary to adjust the parameters by trial and error in the early stages of equipment design, such as by trial production. Setting is performed automatically, which has the effect of greatly reducing the number of development steps.
- the method of this embodiment which controls the transmitting side and maintains the new communication quality, is based on the conventional wireless communication technology that controls the receiver sensitivity (gain) by placing an AGC (automatic gain control) circuit on the receiving side. This is a concept that is significantly different from the previous one, and has the effect of simplifying the system configuration and minimizing unnecessary radiation. .
- FIG. 7 is a block diagram showing the information transmission method according to the present invention and a simplified main part of an electronic device using the information transmission method. An embodiment in which the logic circuit 307 and the synchronization circuit 316 are simplified based on the concept will be described. Each block with the same number as in FIG. 7 has the same name and function as in FIG.
- the horizontal synchronization signal 320 output from the LCD controller 303 and the vertical The period signal 3 2 1 is sent to the receiving side by wire as the second category information. That is, the horizontal synchronization signal 320 is directly supplied to the logic circuit 318 on the receiving side without passing through the logic circuit 307 on the transmitting side in FIG. The signal is directly supplied to the demodulator 314 and the logic circuit 318 on the receiving side without passing through the logic circuit 307 on the transmitting side in FIG.
- the receiving side does not need to detect the packet synchronization for knowing the start of the packet, and the synchronization circuit 316 and the logic circuit 307 are not required. Unnecessary or extremely simple.
- FIG. 8A is a block diagram showing a main part of an electronic apparatus according to an embodiment of the present invention.
- FIG. 8A shows the modulator 308 and the demodulator 314 of Embodiments 5 and 6 in more detail.
- a carrier oscillator 502 is a rectangular pulse oscillator corresponding to the carrier oscillator 309 of the fifth embodiment.
- the multiplier 503 multiplies the carrier oscillator 502 by the input data 503, outputs a transmission signal 504, and sends it to the transmission antenna. Since both the input data 503 and the output of the carrier oscillator 502 are digital signals, the multiplier 5001 may be an exclusive OR circuit.
- the input / output of the exclusive OR circuit acts as a multiplier.
- the communication distance is extremely short, harmonic interference to other equipment and the like can be suppressed to a low level, so no filter is required between the antenna and the modulator output.
- the demodulators 3 1 and 4 operate as follows.
- the received signal received by the receiving antenna 311 in FIG. 6 is amplified and unnecessary bands are removed, and then input to the multiplier 505 as the received signal 507, and the carrier reproduced by the PLL 508
- the high-frequency component is removed by the low-pass filter 506, and the demodulated signal 509 is demodulated.
- the low-pass filter 506 removes high-frequency components (narrow pulse components caused by a slight phase shift between the received signal 507 and the reproduced clock waveform of the PLL 508) of the output of the multiplier 505, Output as demodulated signal 509.
- FIGS. 9A to 9C show time diagrams of the modulator 308 described above. That is, FIG. 7A shows a carrier clock signal generated by the carrier oscillator 502, FIG. 7B shows transmission data 503, and FIG. 7C shows an output transmission signal 504. If the time diagram in the figure is viewed as a digital circuit, the modulator 308 is an exclusive OR, and if it is viewed as an analog value taking a value of ⁇ 1, the modulator 308 is a multiplier.
- FIGS. 9D to 9F show time diagrams of the demodulator according to the seventh embodiment. That is, FIG. 7D shows the received signal, FIG. 7E shows the pulse train generated from the PLL 508, FIG. 7F shows the output of the multiplier 505, and the low-pass filter 506 outputs the received signal 507 and the PLL 508 from this signal.
- the demodulated signal 509 is restored by removing high-frequency components caused by a slight phase difference of the output.
- demodulation does not work well if the carrier clock (Fig. 9 (a)) and the recovered clock (Fig. 9 (e)) have different frequencies or are out of phase.
- high-precision oscillators were separately installed on the transmitting side and the receiving side to minimize errors.
- the reproduced clock on the receiving side is based on the carrier oscillator 502 on the transmitting side, so that a reproduced clock of the same frequency can always be secured, and therefore the stability of the oscillation frequency can be maintained. And errors due to frequency accuracy do not occur. Even with an inexpensive oscillator, a circuit with extremely high stability can be constructed.
- the communication distance is a short distance, and the communication quality with a sufficiently high SN ratio can be ensured. Therefore, the signal can be amplified to a good degree as a digital value.
- the amplified signal level increases to the logic value level, but the load driven by the logic value is not a long distance with a large stray capacitance such as from the CPU to the display, but rather the same semiconductor chip. Because it is extremely short and has a low load, the power consumption does not increase.
- the multiplication can be realized by a simple switch circuit because the output of the PLL 508 is rectangular (having a value of ⁇ 1). That is, two amplifiers having the same absolute value of the amplification degree and the opposite polarities are prepared, and when the logic level of the output of the PLL 508 is 1, the inverting amplifier output of the reception signal 507 is selected by a switch, and the PLL 508 output Can be realized by selecting the non-inverting amplifier output of the reception signal 507 when the logic level is 0.
- a circuit having such a configuration may be used as the multiplier 505.
- the modulator 308 is an exclusive OR circuit
- the demodulator 314 is also an exclusive OR circuit. Circuit It can be realized very simply by using one or an amplifier and switch circuit with positive / negative amplification and a low-pass filter.
- FIG. 8B is a diagram showing a block diagram of a main part of an embodiment of an electronic apparatus according to the present invention.
- FIG. 8B shows another example of the modulator 308 and the demodulator 314 of the fifth and sixth embodiments.
- FIG. 8B shows another example of the modulator 308 and the demodulator 314 of the fifth and sixth embodiments.
- the carrier oscillator 5 13 is a rectangular pulse oscillator: C corresponding to the carrier oscillator 309 of the fifth or sixth embodiment.
- QP SK a transmission signal is encoded and transmitted by allocating two bits (ie, data bit 1 and bit 2) for each symbol. That is, the phase shift amount is encoded, modulated, and transmitted with respect to the reference clock, for example, as shown in Table 1.
- the encoder 5 12 controls the phase shifter 514 and the multiplier 5 15 so that the phase shift as shown in Table 1 is performed by the bit pattern of the data bit 1 and the data bit 2.
- FIG. 9 (g) to 9 (j) are time charts showing the operation of each part of the modulator shown in FIG. 8 (b).
- Bit 1 (FIG. 9 (h)) and bit 2 (FIG. 9 (1)) of the transmission data are encoded by the encoder 512.
- the encoder 5 12 determines whether or not the carrier (FIG. 9 (g)) oscillated by the carrier oscillator 5 13 is phase-shifted by 90 ° by the phase shifter 5 14. It controls whether the carrier is inverted (180 ° phase shift), and finally outputs a QPSK-modulated transmission signal 515 (Fig. 9 (j)).
- the frequency divider 517 corresponds to the frequency divider 326 of the fifth or sixth embodiment
- the PLL 520 corresponds to the PLL 315 of the fifth or sixth embodiment.
- the recovered clock output from the PLL 520 is multiplied by a received signal 5 18 (FIG. 9 (k)) by a first multiplier 5 19 to form a first low-pass filter.
- the high-frequency component is transmitted to 5 23, and the high-frequency component is removed and transmitted to the decision circuit 5 25.
- the received signal 5 18 is
- the generated recovered clock pulse train is multiplied by a 90 ° phase shifter 52 2 by a 90 ° phase shifted pulse train (Fig.
- the discrimination circuit 525 determines the transmission data from the outputs (FIGS. 9 (n) and (q)) of the first and second low-pass filters 523 and 524, and determines the reception signal 518. Demodulate.
- the speed of data transmission can be increased without increasing the occupied band of the transmission signal 516.
- both the modulator and the demodulator can be realized by a simple digital circuit, they can be embedded in a semiconductor chip, and the increase in cost and power consumption can be ignored.
- the reproduction clock required on the receiving side is generated based on the same carrier oscillator 513 as the transmitting side, no error occurs due to the accuracy of the clock frequency between transmission and reception. Even with an inexpensive oscillator, stable data transmission is possible. Even if the frequency of the carrier oscillator 5 13 is unilaterally changed on the transmitting side, the receiving side always follows, so that electronic devices such as wireless communication devices do not interfere with the communication channel according to the communication channel.
- Such a frequency can be unilaterally selected on the transmitting side. (This is the same in any of Embodiments 5, 6, and 7 above.) In other words, it is extremely easy to take measures against interference or disturbance to the communication intended for the electronic device such as a communication device. Can be.
- FIG. 10 is a diagram showing a block diagram of a main part of an embodiment of another information transmission method and an electronic device according to the present invention.
- the functions of the CPU 701, the video memory 702, and the liquid crystal controller 703 are the same as those described in the fifth and sixth embodiments, and are generated by the liquid crystal controller 703.
- the display data 7 25, the horizontal synchronizing signal 7 23 and the vertical synchronizing signal 7 24 are multiplexed by a spread code generated by a spread code generator 7 05 and a code multiplexing circuit 7 4.
- parallel data is code-multiplexed as follows, parallel-to-serial conversion by the parallel-to-serial conversion circuit 304 of the fifth or sixth embodiment is unnecessary, and therefore the inverse conversion, that is, The serial-to-parallel conversion circuit 317 is also unnecessary.
- Code sets that are orthogonal to each other are often used as spreading codes. Since the display data 725 is read out from the video memory 102 in units of pixels, it is output as parallel digital data. Each bit of this data signal and spread code generation The code is multiplied (or exclusive ORed) with each code generated by the unit 705, analog added, and code multiplexed. The multiplexed signal is modulated by a carrier generated by a carrier oscillator 706 by a modulator 707, and passes through a radio propagation path 726 as an electromagnetic wave signal as first category information from a transmitting antenna 708. Sent.
- the transmitted electromagnetic wave signal is received by the reception antenna 709, amplified by the preamplifier 710, and the unnecessary signal outside the predetermined band is removed by the band'pass filter 711, and then demodulated by the demodulator 712. Is done.
- the PLL 715 divides the carrier frequency generated by the carrier oscillator 706 by the frequency divider 713 and divides the carrier frequency by using the signal transmitted as the second category information as a reference. Restore.
- the signal demodulated by demodulator 7 12 is multiplexed by despreading circuit 7 14 by calculating a spread code for multiplexing generated by spreading code generator 7 16 and a correlation. Data is separated.
- the logic circuit 717 Based on the detected display data and various timings, the logic circuit 717 generates a display data signal 718, a horizontal synchronization signal 711, a vertical synchronization signal 720, and a clock for the X driver to drive the LCD driver. Generates a lock signal 7 21 and sends it to the liquid crystal display for display.
- the demodulator 712 uses the carrier generated by the PLL 715 based on the same frequency oscillated by the carrier oscillator 706 of the modulator 707, errors due to the accuracy of the carrier frequency are reduced. Does not occur.
- the timing for the synchronous detection and the timing for the despreading of the demodulator 7 12 can be generated based on the horizontal synchronization signal 7 23 transmitted by wire as the second category information. This eliminates the need for a circuit for synchronization acquisition on the receiving side, and simplifies the circuit. In particular, in the case of code multiplexing, it becomes possible to use a correlator instead of a matched filter as a despreading circuit. ,
- the matching filter has a complicated circuit in despreading, but in this embodiment, the response time is short and no synchronization is required.
- a correlator when used for despreading, it is not possible to perform despreading unless synchronization is obtained. Usually, the calculation is performed by trial and error by sliding one chip at a time. Cannot spread.
- the synchronization information of the correlator is transmitted as the second category information by wire, there is no need to perform synchronization acquisition or sliding, and the despreading is performed by a very simple circuit. Becomes possible.
- signals are multiplexed and transmitted / received without performing data parallel / serial conversion. This has the same effect as running several bus lines in parallel.
- multiplexing with orthogonal codes has few restrictions and does not require physical space like bus lines. It is also possible to arrange a plurality of transmission units and reception units and communicate simultaneously in several different places where signal transmission / reception is required. In addition, it is possible to increase the spread gain by spreading, and it is particularly effective for devices that generate radio waves, such as mobile phones, to improve the anti-interference with the intended radio wave and to improve the interference characteristics.
- FIG. 11 is a block diagram showing a main part of an embodiment of a data transmission / electronic device according to the present invention.
- the functions of the CPU 801, the video memory 802, and the liquid crystal controller 803 are the same as those described in the fifth and sixth embodiments.
- the display data 8 25, the horizontal sync signal 8 2 3 and the vertical sync signal 8 24 generated by the liquid crystal controller 8 03 are parallel-converted by the logic circuit 8 4. Is rearranged and converted to serial and serial signals.
- the primary modulator 805 modulates this signal with a pulse train generated by the pulse generator 806. For the primary modulation, pulse position modulation or biphase pulse modulation can be used for the pulse train.
- the spread-modulated pulse train is pulse-shaped by a pulse shaping circuit 809 to form a broadband pulse with a low spectral density for a very short time. Is done.
- the emitted electromagnetic field is not a modulated sine wave but a very narrow pulse train.
- Such communication using a short pulse and a wide band pulse is called an impulse radio (Impu1seRadio) or UWB communication system.
- the radiated electromagnetic wave is received by the receiving antenna 811 through the radio propagation path 826, amplified by the preamplifier 812 if necessary, and then pulsed by the correlator 814.
- the correlation with the pulse template generated in 8 13 is calculated.
- the output of the correlator 8 14 is despread by a despreading circuit 8 15 by a spreading code generated by a spreading code generator 8 16, and then demodulated by a demodulator 8 17.
- Modulator 805 input The logic circuit 818 is based on the display data detected by the demodulator 817 and the horizontal synchronizing signal 823 sent from the transmitting side as the second category 1 information through the wired path 827.
- a display data signal 819 for driving the liquid crystal driver, a horizontal synchronizing signal 820, a vertical synchronizing signal 821, and an X clock signal 822 of the X driver are generated and sent to the liquid crystal display for display.
- the configurations of the correlator 814 and the logic circuit 818 are much simpler than when there is no reference timing information.
- the essence of UWB communication is to use short pulses with extremely low spectral density.
- the legal upper limit of the release energy is allowed to the level of unnecessary radiation regulated by EMI, which is far higher than that of radio stations that do not require a license (about 2 O dB). loose. For this reason, it is easy to set a link budget that can ensure sufficient communication quality even in an electronic device such as a mobile phone that emits strong radio waves internally, which is the original purpose. Since the pulse to be used can have a narrow pulse width and a high peak value, the preamplifier 8 12 can be omitted.
- this embodiment may interfere with each other and cause serious interference. This can be avoided by synchronizing the windows on the axis or by performing frequency hopping and synchronizing the hopping sequence.
- the present embodiment may be applied to the synchronization information as the second category information.
- the modulation operation is performed only on the time axis, and most of the components can be realized only by a digital circuit that handles pulses, and it is easy to convert circuit elements into ICs.
- the use of short pulses will increase the spread gain in the time direction, not only improving the anti-interference and interfering characteristics with the emitted radio waves as the original function of the electronic device, but also achieving multi-channel as a communication transmission path. Can be.
- FIG. 12 is a diagram showing a block diagram of a main part of another embodiment of the electronic device according to the present invention.
- FIG. 12 shows an example in which the information transmission method according to the present invention is applied to an electronic device using an image sensor.
- an image sensor 901 includes a horizontal synchronizing signal 92 0 generated from a control circuit 92. And is activated by the vertical synchronizing signal 921 to output the picked-up image data 910.
- the logic circuit 903 receives these signals and constructs a packet for wireless transmission.
- the packet is modulated by a modulator 905 on a carrier generated by a carrier oscillator 906 and radiated from a transmission antenna 907 as an electromagnetic wave.
- the electromagnetic wave signal transmitted from the transmitting antenna 907 propagates through a radio propagation path (space) 922, is received by the receiving antenna 908, is amplified by the preamplifier 909, and is band-pass filtered 910. Thus, unnecessary out-of-band signals are removed and input to the demodulator 9 12.
- the PLL 915 divides the carrier outputted from the carrier oscillator 906 by the divider 904 and transmits the divided carrier as the second category information through the wired path 923. 4 Multiplies the output to the carrier frequency to generate a carrier and inputs it to the demodulator 912.
- the demodulator 912 also uses the synchronization timing required for demodulation from the signal from the control circuit 902 transmitted as the second category information through the wired path 923 to demodulate the received signal. Do.
- the serial / parallel conversion circuit 914 extracts the image data portion from the demodulated received packet, performs serial / parallel conversion for each pixel, and generates pixel data.
- the logic circuit 916 generates a memory address for writing to the video memory 917 in accordance with the demodulated pixel data, and transfers the image data directly or via the CPU 918 to the video memory 917. Write to the address.
- the CPU 918 accesses the video memory 917 and uses the image data for various applications.
- control such as activation of the image sensor 901 is performed by the CPU 918.However, information on this activation is transmitted to the control circuit 902 of the image sensor 901 because the bit rate is low. 2 It is preferable to transmit by category as category information by wire, but it is also possible to transmit wirelessly. In that case, both the CPU 918 side and the imaging element 901 side have transmission / reception means and perform bidirectional communication. In particular, in a clamshell mobile phone, the image sensor 901 and the display device are placed close to each other, and are often on the opposite side to the CPU 918 side. After being sent to the 8 side and processed, it is sent back to the display element side. In such a case, this can be realized by adopting a configuration in which the fifth or sixth embodiment is placed back to back. It is possible.
- the above configuration that is, wireless data transmission from the image sensor 901 has become more prominent as the image sensor 901 has become larger, increasing power consumption, restricting wiring positions, EMI problems, and reliability.
- Various problems caused by wired transmission such as deterioration in performance, can be eliminated.
- the synchronization timing required for demodulation is sent by wire, eliminating the need for synchronization acquisition and greatly simplifying the circuit.
- the carrier wave generated by the same oscillation source between transmission and reception is used as a reference, the frequency accuracy required for the carrier oscillator 906 is remarkably relaxed, which has a great effect on cost reduction and feasibility.
- FIG. 13 is a diagram illustrating another embodiment of an electronic device using the information transmission method according to the present invention, which is an example used for data transmission between semiconductor chips.
- the semiconductor chip 101 includes a circuit element 1001 (generating) having a plurality of data to be transmitted in the semiconductor chip 101, and the semiconductor chip 101 There is a circuit element 1005 in the semiconductor chip 101 that receives the data.
- the semiconductor chips 101 and 102 are provided with control circuits 1003 and 106, respectively, for communicating with each other via a wired path 104, and are provided with wireless propagation.
- a transmission antenna 11010 and a reception antenna 1011, which communicate with each other via a path 11015, are provided. Then, it is assumed that data transmission is performed from the semiconductor chip 101 to the semiconductor chip 103.
- the control circuit 1003 activates the circuit element 1001 to output data to be transmitted, and the multiplex circuit 1002 receives and multiplexes the transmission data from the circuit element 1001. Multiplexing uses parallel-to-serial conversion as described in the fifth or sixth embodiment or code multiplexing as in the ninth embodiment.
- the modulator 1004 receives the output of the multiplexing circuit 1002, modulates it, and transmits it as an electromagnetic wave signal by the transmission antenna 10010.
- the control circuit 1003 simultaneously generates multiplexing and modulation synchronization and other timing signals and carrier waves.
- a signal serving as a reference for a carrier is also generated by using the method described in the fifth to eleventh embodiments, and these signals are transmitted to the control circuit 106 on the receiving side through the wired path 104.
- the signal propagated through space (wireless propagation path) 101 and received by receiving antenna 101 is demodulated by demodulator 1008 and multiplexed by demultiplexer circuit 1007. Based on the The signal is sent to the circuit element 105 which receives the signal.
- the control circuit 1006 receives a multiplexed signal, a modulation synchronization signal, other timing signals, and a carrier reference signal from the transmission-side control circuit 1003, synchronizes demodulation ⁇ demanipulation, and uses it in the demodulator 1008. Restore the carrier. Receiving these signals greatly simplifies the demultiplexing / demodulation circuit, and greatly reduces the demands on the accuracy of the oscillation frequency.
- the transmitting and receiving antennas 101, 101 may be formed on the semiconductor chip 101, 102, 103, or a signal may be extracted to the outside of the chip via bonding pads, and the antenna may be removed. It may be attached.
- the number of pins on the semiconductor chip can be significantly reduced, and compared to the conventional method of driving with a stray capacitance to extract logic level signals through bonding pads. Power can be greatly reduced.
- FIG. 14 is a view showing still another embodiment of the electronic apparatus using the information transmission system according to the present invention, which is applied to a home theater.
- the home theater includes an image display unit 1305, a tuner decoder unit 1301, and a speaker unit '1324.
- the image display section 135 has a built-in image display device, and receives and displays an image signal.
- the speaker section 1 3 24 is usually composed of a plurality of speakers 1 3 1 1, 1 3 1 2, 1 3 1 3, 1 3 1 4, 1 3 1 5 and each speaker 1 3 1 1, 1 3 1 2, 1 Controls and amplifies sound effects by receiving audio signals every 3 1 3 1 3 14 1 3 1 5 Speakers 1 3 1 1, 1 3 1 2, 1 3 1 3, 1 3 14, 1 3 It consists of a drive part that drives 15. Take the following methods to connect between them.
- the playback unit 1302 of the tuner decoder unit 1301 extracts image and audio data from image and audio sources such as TV tuners and DVD recorders according to instructions from the control circuit 1320.
- the data output from the reproducing unit 1302 is multiplexed by the multiplexing circuit 1303 for each image and audio channel.
- the multiplexing is performed by synchronizing with the reference signal generated by the control circuit 1320, multiplying the spread code generated by the spreading code generator 1321 for each channel, and adding the results of the multiplication to analog.
- the multiplexed data is modulated by the modulator 1309 and transmitted from the transmitting antenna 1317 as the first category information.
- the carrier oscillator 1304 doubles the carrier based on the reference signal generated by the control circuit 1320 to generate a carrier.
- Control circuit 1 3 The reference signal emitted by 20 is transmitted as second category information to the image display section 135 and the speaker section 132 via the wired path 131-166.
- Image data, text data or audio data propagates through the radio channel 13 19 as the first category information, is received by the receiving antenna 13 18, demodulated by the demodulator 13 07 and despread circuit 13 0
- the image signal is extracted by despreading and demultiplexing by 8, and the extracted image data is stored in the display storage circuit 1310.
- the image data stored in the display storage circuit 1310 is sequentially read out and displayed on a screen of an image display device built in the image display section 135.
- the information sent to the speaker unit 1324 is copied in the same configuration as the inside of the image display unit 1305.
- the description is redundant and will not be described in further detail.
- the carrier for demodulation is multiplied based on the reference signal transmitted by wire as the second category information by the control circuit 1323, and the carrier oscillator 1306 oscillates.
- a spreading code generator 1322 used for despreading generates a spreading code in synchronization with a reference signal sent as second category information by a control circuit.
- FIG. 15 is a conceptual diagram showing a main part of still another embodiment of the information transmission method according to the present invention.
- data is transmitted from the transmitter block 211 to the receiver block 211.
- the transmission block 211 is provided with a transmission circuit 211 having information to be transmitted
- the reception block 211 is a reception circuit 2 for receiving the transmission information. 104 are provided.
- the transmission information issued by the transmission block 2 1 1 2 is the first category one information
- the first category information is modulated by the modulator 210 and transmitted as an electromagnetic wave from the transmitting antenna 210.
- the second category information is passed through the interface circuit 210.
- the electromagnetic wave signal that is superimposed on the power supply line 2107 and transmitted by wire together with the power supply and carries the first category information that is emitted from the transmission antenna 2110 and propagates in the space (wireless propagation path 2108) is The signal is received by the receiving antenna 211, demodulated by the demodulator 210, and output to the circuit 210.
- the second category information superimposed on the power supply line and transmitted by wire is output from the interface circuit.
- the information is transmitted to the circuit 210 via the interface 205.
- the second category information may be transmitted from the reception block 211 to the transmission block 211, in which case the interface is used.
- Circuit 2 105 Sent to the interface circuit 210.
- the second category information includes information that does not require high-speed mass data transfer, synchronization information for wireless transmission / reception, oscillator information, feedback information that feeds back the data reception status, and encryption for enhanced security. Information or the like can be considered, and information generated by the interface circuit 210 or the interface circuit 210 itself can be included in the second force category information.
- the interface circuit 3103 also collects the second category information generated by the transmission circuit 2101, and finally sends out the second category information together with the second category information generated by itself.
- the synchronization information of the communication packet can be obtained regardless of the wireless propagation path 210, a circuit for extracting the synchronization information on the receiving side becomes unnecessary, and the circuit on the receiving side can be significantly simplified. Also, by sending the correlator synchronization information necessary for spread spectrum and UWB communication, the structure of the correlator can be significantly simplified. Furthermore, if oscillator information can be transmitted, a common clock signal can be used between transmission and reception, and the oscillation frequency accuracy required for the oscillator is remarkably relaxed, facilitating the realization of an electronic device.
- the electromagnetic waves transmitting the first category information may interfere with the electronic device's original communication.
- the electromagnetic wave transmitting the first category and the first information is transmitted and received.
- the frequency of the In the case of Bluetooth or UWB, the hopping pattern and the like can be selected, and these signals can be generated from the interface circuit 210 or the interface circuit 210.
- the information of the second category is placed on the power supply line 210 together with the power supply, and transmitted and received between the transmission block 211 and the reception block 211.
- the power supply 2 1 16 supplies power to all circuits in the transmission block 2 1 12, and the second category information generated by the interface circuit 2 1 0 3 is supplied to the power supply line 2 1 0 by the superposition circuit 2 1 1 5 Superimposed on 7.
- the details of the inside of the superimposing circuit 2 1 15 will be described in a dashed line 2 1 1 7.
- Terminals 2 1 2 8 are connected to power supplies 2 1 1 and 6, and terminals 2 1 2 and 9 are connected to power supply line 2 107. Is the second category information generated from the interface circuit 2 103 a terminal?
- the signal of the second category information superimposed by the mouth-pass filter 2 1 2 7 does not leak to the terminal 2 1 2 8 side, so that all circuits of the transmission block 2 1 1 2 operate correctly.
- the second category information superimposed on the power supply line 210 is separated by the separation circuit 211 and transmitted to the interface circuit 210.
- Terminal 2 121 is connected to power supply line 210 7.
- the signal of the second category information input to the terminal 211 is separated by the high-pass filter 211 and transmitted to the interface circuit 210 from the terminal 210.
- the low-pass filter 2 1 2 2 prevents the leakage of the second category information, so that only the energy supplied from the power supply 2 1 1 2 is transmitted from the terminal 2 1 1 9 and the energy in the receiving block is transmitted through the terminal 2 1 1 9. Properly supply power to all circuits.
- the second category information is sent from the reception block 2 1 1 3 to the transmission block 2 1 1 2 side, the functions of the superposition circuit 2 1 1 2 and the separation circuit 2 1 1 4 are reversed, but As shown in FIG. 15, the same circuit configuration may be used.
- the second category information for remarkably simplifying the transmission / reception modulator 2102 and demodulator 2106 can be superimposed on the power supply line 210 and transmitted. Signals in the electronic device can be exchanged with a minimum number of wires, and a highly reliable electronic device can be realized by a simple method.
- FIG. 16 is a view showing still another embodiment of the electronic device according to the present invention.
- the electronic device is divided into a main body 222 and a display 222, and is integrated via a hinge 222.
- the power supply 2 2 13 is located in the main body 2 205.
- a power supply voltage is supplied to each electronic circuit in the main body through wiring on the board, and a superimposed circuit is also provided.
- the second category information is superimposed on the power supply voltage by 2 2 14 and sent to the display 2 2 1 2 through the electric wire 2 2 1 1.
- the separation circuit 2 2 15 separates the superimposed power supply voltage and the second category information, and the power supply voltage is distributed to each circuit of the display unit 2 1 2 through the wiring on the substrate of the display unit 2 2 1 2. .
- the display data generated by the liquid crystal controller 222 is sent to the modulator 222 as first category information, modulated, converted to electromagnetic waves (radio waves) by the transmission antenna 220, and propagated through space.
- the electromagnetic wave signal transmitted from the transmitting antenna 222 is received by the receiving antenna 220, demodulated into display data by the demodulator 222, transmitted to the liquid crystal driver 2201, and transmitted to the liquid crystal driver 220. Displayed in 6. .
- the synchronization signal of the modulator 220 and the demodulator 222 is superimposed on the power line 222 by the superimposing circuit 222 as the second category information, and separated through the power line 222.
- the signal is sent to the circuit 222, and the separation circuit 222 separates the second category information from the power supply and transmits it to the demodulator 222. Since the data rate of this signal is not so high and the number of necessary signal lines is small, it is easy to superimpose it on the power supply line 2 211 and wire it through the hinge 220 7. As a result, the degree of freedom in wiring and component arrangement is increased, and as shown in FIG. 16, the modulator 220, which is a signal transmitting unit, the transmitting antenna 220, and the demodulator 222, which is a receiving unit. It is also possible to arrange the receiving antenna 2 210 in a position far from the hinge 222.
- FIG. 17 shows a more detailed configuration of the information transmission system according to the present invention, and an electronic device using the same.
- FIG. 13 is a block diagram showing another embodiment of FIG.
- the CPU 2301 generates display data to be displayed by calculation or the like, and records it in the video memory 2.302.
- the liquid crystal controller 2303 reads out the data 2319 to be displayed on the display from the video memory 2302 in a predetermined order, and outputs the data along with the vertical synchronization signal 2321 and the horizontal synchronization signal 2320.
- the data to be displayed is usually read out from the video memory as data in pixel units in parallel from the video memory.
- the parallel conversion is performed by 2304 and transmitted to the logic circuit 230.
- Logic circuit 2
- the 307 receives the signal output from the parallel / vertical conversion circuit 2304, the horizontal synchronizing signal 230 and the vertical synchronizing signal 230, generates a bucket, and generates a bucket as the first category information. It is sent to 2303, and the reference signal 2306 representing the head of the signal is output to the PLL 230 and the superimposition circuit 230 as the second category information.
- the first category information is obtained by multiplying the reference signal 2306 by PLL 230 to generate a carrier wave synchronized with the reference signal. This carrier is modulated by the modulator 238 and transmitted from the transmission antenna 230.
- the reference signal 2306 is superimposed on the power line 230 by the superimposition circuit 230 as the second category information, and transmitted to the separation circuit 230 on the receiving side.
- the receiving antenna 2311 receives the electromagnetic wave signal transmitted from the transmitting antenna 2310. Then, the signal received by the receiving antenna 2 3 1 1 is amplified by the preamplifier 2 3 1 2, the unnecessary band components are removed by the band pass filter 2 3 1 3, and the demodulator 2 3 1 4 Is entered. Further, the reference signal superimposed on the power supply line 233 as the second category information is separated by the separation circuit 233 27, and P L L
- the carrier is restored by 2 3 15 and the carrier is restored and supplied to the demodulator 23 14 to demodulate the electromagnetic wave signal.
- the logic circuit 2 3 16 detects the beginning of the packet from the reference signal separated by the separation circuit 2 3 2 7, and displays the display data 2 3 2 2 in the bucket and the horizontal synchronization signal 2 from the packet.
- the oscillation frequencies of PLL 230 and 230 are selected so that they do not interfere with the original purpose of electronic devices that use radio waves, such as radio receivers and mobile phones. I do. If you can select a frequency of 2 GHz or more, the occupied band is about 200 MHz even if you transmit data of 100 Mbps, and it can be used without any problem in most cases.
- the transmitter modulator 2303 and the receiver demodulator 2314 must handle the same carrier frequency, and the carrier oscillator frequency between transmission and reception is high. Accuracy is required, and the error between the two directly manifests itself as degradation in communication quality.
- the modulator 2308 and the demodulator 2314 use the same reference signal 2306, and the reference signal 2303 and the PLL3150 use the same reference signal. Since the carrier is generated by multiplying 2303, the starting frequencies of the two coincide and no error occurs. For this reason, the accuracy of the carrier oscillator does not matter and there is a cost reduction effect.
- the output of the PLL 230 may be directly superimposed on the power line 230 by the superimposing circuit 230 and transmitted. In this case, the carrier separated by the separation circuit 2327 can be directly input to the demodulator 2314 without using the PLL2315, and the PLL2315 is unnecessary.
- the carrier frequency is high, so it is difficult to transmit the signal through a wired path.
- it is more feasible to create a carrier by using a reference signal with a low frequency and performing doubling with PLLs 239 and 235 that have the same characteristics in both transmission and reception.
- the reference signal 2306 is a signal representing the beginning of a packet for carrying the first category information, and this reference signal is superimposed on the power line 230 and transmitted as the second category information. Therefore, the receiving end can easily detect the head of the packet. As a result, the circuit for extracting data from a packet becomes very simple, and it is not necessary to add a brimble that indicates the beginning of the packet.This greatly simplifies the packet structure and increases the effective communication rate. Can be.
- FIG. 18 (a) is a block diagram showing a main part of still another embodiment of the electronic device according to the present invention, in which the modulator 23 08 and the demodulator 23 14 of the embodiment 16 are shown.
- the PLL 2402 corresponds to the PLL 2309 of the 16th embodiment, and is an oscillator that multiplies a reference signal generated by the control circuit 2407 and generates a rectangular pulse carrier synchronized with the reference signal.
- the multiplier 2401 multiplies the PLL 2402 by the input data 2403, outputs the result as a transmission signal 2404, and sends it to the transmission antenna. Since the input data 2403 and the output of the PLL 2402 are digital signals, the multiplier 2401 may be an exclusive OR circuit.
- the input / output of the exclusive OR circuit acts exactly as a multiplier.
- the communication distance is extremely short, harmonic interference to other devices and the like is originally suppressed to a low level, and no filter or the like is required between the antenna and the modulator output.
- the demodulation unit operates as follows.
- the received signal received by the receiving antenna 23 11 in FIG. 17 is amplified and unnecessary bands are removed, and thereafter, is input to the calculator 2405 as a received signal 2407, and the carrier signal recovered by the PLL 2408 is After the multiplication, the high-frequency component is removed by the low-pass filter 2406, and the demodulated signal 2409 is demodulated.
- the low-pass filter 2406 removes high-frequency components (narrow pulse components generated by a slight phase shift between the received signal 2407 and the reproduced clock waveform of the PLL 2408) of the output of the multiplier 2405 and removes the demodulated signal. Output as 2409.
- the PLL 2408 multiplies the reference signal generated by the control circuit 2407, which is superimposed on the power supply line and transmitted as the second category information, and generates a carrier pulse having the same frequency as the PLL 2402 and the phase of which is synchronized. To play. Although the superimposing circuit and the separating circuit are omitted in FIG. 18 (a), it goes without saying that they are actually inserted between the control circuit 2407 and the PLL 2408.
- FIGS. 9A to 9C show time diagrams of the modulator described above. That is, FIG. 14A shows a carrier clock signal generated by the transmission side PLL, ie, PLL 2402, FIG. 14B shows transmission data 2403, and FIG. 14C shows an output transmission signal 2404. If the time diagram in this figure is viewed as a digital circuit, the modulator is an exclusive OR, and if it is viewed as an analog value that takes a value of ⁇ 1, the modulator is a multiplier.
- Figures 9 (d) to 9 (f) show the time diagrams of the demodulation circuit.
- D is the received signal 2407
- e is the pulse train generated from the PLL on the receiving side, ie, PLL 2408
- f is the output of the multiplier 2405
- the low-pass filter 2406 High-frequency components generated by the slight phase difference between the received signal 2407 and the PLL 2408 output Then, the demodulated signal 2409 is restored.
- the carrier clock on the transmitting side (Fig. 9 (a)) and the recovered carrier clock on the receiving side (Fig. 9 (e)) have different frequencies or have different phases.
- the key does not work well.
- tracking was performed separately using high-precision oscillators on the transmitting and receiving sides to minimize errors.
- the generation of the carrier wave on the transmission side and the reception side is performed by the PLLs 2402 and 2408 having the same characteristics with respect to the reference signal generated by the control circuit 2407 on the transmission side.
- the same frequency can be secured. Therefore, no error occurs due to the stability of the oscillating frequency and the frequency accuracy.
- a very stable circuit can be constructed even with an inexpensive circuit.
- the communication distance is a short distance, and communication quality with a sufficiently high S / N ratio can be ensured. Therefore, the signal can be amplified to a degree that can be viewed as a digital value. In this case, the amplified signal level increases to the logical value level, but the load driven by the logical value is not a long distance with a large stray capacitance such as from the CPU to the display, but rather within the same semiconductor chip. Since the load is extremely short and low, power consumption does not increase.
- the multiplication can be realized with a simple switch circuit because the output of the PLL 2408 is rectangular (having a value of ⁇ 1). That is, two amplifiers having the same absolute value of the amplification degree and the opposite polarities are prepared.
- the logic level of the output of the PLL 2408 is 1, the inverted amplifier output of the reception signal 407 is selected by the switch, and the logic level is set to 0.
- multiplication can be realized by selecting the output of the non-inverting amplifier.
- a circuit having such a configuration may be used as the multiplier 2405.
- the modulator can be realized very simply by an exclusive OR circuit, the demodulator can be realized by one exclusive OR circuit, an amplifier and a switch circuit having positive and negative amplification degrees, and a low-pass filter.
- FIG. 18 (b) is a diagram showing a block diagram of a main part of another embodiment of the electronic apparatus according to the present invention.
- FIG. 18 (b) shows another example of the modulator 2308 and the demodulator 2314 of the embodiment 16.
- FIG. 17 the simplified BPSK modulation is taken as an example.
- an example based on the QPSK is shown to show a case where more general phase modulation is used.
- the PLL 24 13 corresponds to the PLL 23 09 of the embodiment 16, and is generated by the control circuit 2417. It is a rectangular pulse oscillator that multiplies the reference signal and generates a carrier wave synchronized with the reference signal.
- 9 (g) to 9 (j) are time charts showing the operation of each part of the modulator shown in FIG. 18 (b).
- Bit 1 (Fig. 9 (h)) and bit 2 (Fig. 9 (i)) of the transmission data are encoded by the encoder 2412 and the carrier wave oscillated by the transmission side PLL, that is, the PLL 2413 (Fig. 9 (g)) is shifted by 90 ° by the phase shifter 24 14 and the multiplier 241 5 controls whether the carrier is inverted (180 ° phase shift). Then, a QP SK modulated transmission signal 2415 (FIG. 9 (j)) is output.
- the control circuit 2417 corresponds to the logic circuit 2307 of the embodiment 16, and the reference signal generated by the control circuit 2417 is superimposed on the power supply voltage as the second category information and transmitted to the receiving side. Although the superimposing circuit and the separating circuit are omitted in FIG. 18 (b), it goes without saying that they are actually inserted between the control circuit 2407 and the PLL 2408.
- the PLL 2420 corresponds to the PLL 2315 in the embodiment 16 and multiplies the reference signal superimposed on the power supply line 2330 shown in FIG. Figure 9 (1)) is generated. The recovered clock output from the PLL 2420 is multiplied by a received signal 2418 (FIG.
- the determination circuit 2425 determines transmission data from the outputs (FIGS. 9 (n) and (q)) of the first and second low-pass filters 2423 and 2424 to demodulate the reception signal.
- the speed of data transmission can be increased without increasing the occupied band of the transmission signal.
- both the modulator and the demodulator can be realized with a simple digital circuit, they can be embedded in a semiconductor chip, and the increase in cost and power consumption can be ignored.
- the carrier clock required for transmission and reception is multiplied by a reference signal generated from the same control circuit 2417 for transmission and reception by PLL 2.413 and 2420 having the same characteristics to obtain the same frequency with the same phase. Therefore, no error due to clock frequency accuracy occurs between transmission and reception. Even with an inexpensive oscillator, stable data transmission is possible.
- control circuit 24 17 Even if the control circuit 24 17 unilaterally changes the frequency of the reference signal, Since the transmitting side and the receiving side follow each other, for example, in an electronic device such as a wireless communication device, select a frequency that does not disturb the communication channel according to the communication channel, and ⁇ 3 ⁇ 4 Can be changed. (This is the same in any of Embodiments 16 and 17 above.) If this property is used well, it is extremely easy to take measures against interference or interference with the intended communication of electronic devices such as communication equipment. It is also possible.
- FIG. 19 is a diagram showing a block diagram of a main part of another embodiment of an information transmission method and an electronic device according to the present invention.
- the functions of the CPU 2601, the video memory 2602, and the liquid crystal controller 26p3 are the same as those described in the embodiment 16 above, and are generated by the liquid crystal controller 2603.
- Display data 2 6 2 5, the horizontal synchronization signal 2 6 2 3 and the vertical synchronization signal 2 6 2 4 are multiplexed by the spreading code generated by the spreading code generator 2 6.5 and the code multiplexing circuit 2 6 4 4 Be transformed into
- parallel data is code-multiplexed as follows, parallel-to-serial conversion by the parallel-to-serial conversion circuit 2304 of the embodiment 16 is unnecessary, and therefore its inverse conversion, that is, serial-parallel conversion circuit 2 3 1 7 is also unnecessary.
- the spreading code As the spreading code, a code set orthogonal to each other is often used.
- the spreading code is generated by synchronizing the beginning of the code with the horizontal synchronization signal 2623 generated by the liquid crystal controller 2603. Also, since the spread code generator 2605 uses a horizontal synchronization signal 2623 which is multiplied by PLL266, the carrier and the spread code are completely synchronized.
- the display data 2625 is read out from the video memory 2602 collectively for each pixel, it is output as parallel digital data.
- Each bit of this data signal is multiplied by each code generated by the spreading code generator 2605 by the horizontal synchronization signal 266 3 and the vertical synchronization signal 266 4 (or exclusive ORed).
- B) Analog addition and code multiplexing are performed.
- the multiplexed signal is modulated by the carrier wave generated by the PLL 266 by the modulator 266 and transmitted from the transmitting antenna 266 as the first category information by the electromagnetic wave signal as the first category information. Sent through 6 2 6 (space).
- the carrier is completely synchronized with the horizontal synchronizing signal 2623 because the carrier is generated by multiplying the horizontal synchronizing signal 2623 by the PLL266.
- the horizontal synchronization signal 2623 is also synchronized with the spread code generator 2605.
- the horizontal synchronization signal 2 6 2 3 is also used as the second category information as a superposition circuit 26
- the signal is superimposed on the power supply line 2627 by 13 and sent to the separation circuit 2622 on the receiving side.
- the transmitted electromagnetic wave signal is received by the receiving antenna 2609, amplified by the preamplifier 2610, and after unnecessary signals outside the predetermined band are removed by the bandpass filter 2611, the demodulator 2611 Demodulated by 2.
- the PLL 2615 separates the horizontal synchronizing signal 2.623 superimposed on the power supply line 2627 as the second category information by the separation circuit 2622 and passes it based on this. Multiply the number of conveyances.
- the signal demodulated by the demodulator 2 6 1 2 is sent to the despreading circuit 2 6 1 4, where the signal for the multiplexing generated by the spreading code generator 2 6 16 is sent.
- the multiplexed data is separated by calculating the spreading code and correlation.
- the logic circuit 26 17 receives the display data and various timings from the detected display data and the display data signal 26 18 to drive the LCD driver, the horizontal synchronization signal 26 19, the vertical synchronization signal 26 20 And the waveform shaping and timing adjustment of the X driver's peak signal 262 1 are sent to the liquid crystal display as a drive signal for the liquid crystal display and displayed.
- the carrier waves of the demodulator 2 612 and the modulator 2 607 are synchronized with the horizontal synchronization signal 266 3 serving as the same reference signal, and oscillated by the PLL 266 and PLL 261 with the same characteristics. Therefore, the frequency and the phase of the two coincide, and no error occurs due to the accuracy of the carrier frequency. Also, since the head of the spreading code coincides with the horizontal synchronization signal on both the transmitting side and the receiving side, there is no need to detect the timing for despreading. As a result, a circuit for synchronization acquisition on the receiving side becomes unnecessary, and the circuit can be simplified.
- the horizontal synchronization signal 2 62 3 and the vertical synchronization signal 2 62 4 are also code-multiplexed and transmitted together with the display data 26 25, the synchronization signal for their display is immediately despread at the receiving side. Can also be detected. Since the horizontal synchronization signal 2623 is also superimposed on the power line 2627 as the second category information and transmitted, this signal may be used as the horizontal synchronization signal 2619 without code multiplexing. Further, in order to obtain a spreading gain, a spreading code having a sufficiently wide frequency band may be selected, and spreading modulation may be further performed after the modulator 260.
- FIG. 20 is a block diagram showing a main part of still another embodiment of the electronic device according to the present invention.
- FIG. 20 shows an example in which the information transmission method according to the present invention is applied to an electronic device using an image sensor.
- an image sensor 270 1 includes a horizontal synchronization signal generated from a control circuit 270 2. It outputs the image data 2 7 19 which is activated and activated by the 2 7 2 0 and the vertical synchronization signal 2 7 2 1.
- the logic circuit 2703 receives these signals and constructs a packet for wireless transmission.
- the packet is modulated by the modulator 275 and radiated from the transmission antenna 277 as an electromagnetic wave.
- the carrier used for the modulator 275 is oscillated by the PLL 276 through a reference signal generated by the control circuit 2702.
- the reference signal for example, a signal indicating the head of a packet constructed by the logic circuit 2703 by the control circuit 2702, a horizontal synchronizing signal 270 for starting the image sensor, or the like is used.
- This reference signal is superimposed on the power supply line 2723 as a second category signal by the superimposition circuit 2704, and sent to the separation circuit 2711 on the receiving side.
- the electromagnetic wave signal transmitted from the transmitting antenna 2.707 propagates through a wireless propagation path (space) 2722, is received by the receiving antenna 2708, is amplified by the preamplifier 2709, Unnecessary out-of-band signals are removed by the bandpass filter 2710 and input to the demodulator 2712.
- the PLL 2 715 generates a carrier by multiplying the reference signal extracted from the power supply line 272 by the separation circuit 271 1 as the second category information.
- the demodulator 2712 also uses the synchronization timing required for demodulation from the reference signal from the control circuit 2720 transmitted through the wired path 2723 as the second category information, and Performs signal demodulation.
- the serial-parallel conversion circuit 2714 extracts the image data portion from the demodulated received packet, performs serial-parallel conversion for each pixel, and generates pixel data. Since these circuits can use the reference signal from the control circuit 2702 as the second force category information, there is no need to perform signal detection for synchronization, and the circuit configuration can be significantly simplified. Also, since the carrier frequency is always synchronized with the transmitting side and tracking is performed, the required accuracy is remarkably relaxed.
- the logic circuit 2716 generates a memory address for writing to the video memory 2717 in accordance with the demodulated pixel data, and transfers the image data to the video memory 2 directly or via the CPU 2718. Write to the address of 7 17.
- the CPU 2718 accesses the video memory 2717 and uses the image data for various applications. Normal imaging element
- the control such as the activation of the child 2701 is performed by the force S performed by the CPU 2718, the second category in order to transmit information on this activation to the control circuit 2702 of the image sensor 2701.
- the information can be superimposed on the power line 2723 and transmitted by wire, but it can also be transmitted wirelessly.In the case of wireless transmission, both the CPU 2718 side and the image sensor 2701 side It has wireless transmission / reception means and performs two-way communication.
- the imaging element 2710 and the display element are placed in contact with each other, and are often on the opposite side to the CPU 2718 side. After being sent to the CPU 218 and processed, it is sent back to the display element.
- the second category information only needs to be one on the side where the control circuit 270 is placed.
- both can be synchronized.
- the synchronization timing required for demodulation is superimposed on the power supply line 272 and sent, eliminating the need for synchronization acquisition, reducing the number of wires and greatly simplifying the circuit. it can. ⁇
- FIG. 21 is a block diagram showing a main part of an embodiment of a data transmission and an electronic apparatus according to the present invention.
- the functions of the CPU 2801, the video memory 2802, and the liquid crystal controller 2803 are the same as those described in Embodiments 16 and 19 above.
- the display data 2825, the horizontal synchronizing signal 2832 and the vertical synchronizing signal 2824 generated by the liquid crystal controller 2803 are applied to the logic circuit 2804 to provide the parallel / translation and preamble addition. Data rearrangement such as packet construction is performed and converted to serial signals.
- the primary modulator 280 modulates this signal with a pulse train generated by the pulse generator 280 06. For the primary modulation, pulse position modulation or biphase pulse modulation can be used for the pulse train.
- the signal that has been subjected to the primary modulation is spread-modulated by the spreading modulator 287 with the spreading code generated by the spreading code generator 288.
- the spread-modulated pulse train is shaped into a very short pulse by a pulse shaping circuit 2809 so as to be a broadband pulse with a low spectral density, and then the electromagnetic wave is transmitted by a transmitting antenna 280.
- Radiated as The radiated field is not a sine wave modulated but a very narrow pulse train.
- the horizontal synchronizing signal 2823 also determines the pulse generation reference for pulse modulation such as pulse position modulation. This signal is superimposed on the power supply line 2827 by the superimposition circuit 2828 as a reference signal of the second category information, and transmitted to the separation circuit 2829 on the receiving side.
- the radiated electromagnetic wave is received by the receiving antenna 2811 through the radio propagation path 2826, amplified by the preamplifier 2812 as necessary, and then pulsed by the correlator 2814.
- the correlation with the pulse template generated by the generator 28 13 is calculated.
- the output of the correlator 28 14 is despread by a despreading circuit 28 15 by a spreading code generated by a spreading code generator 28 16 and then demodulated by a demodulator 28 17 to perform primary modulation. It is converted to the previous signal (the input of the primary modulator 285).
- the logic circuit 2818 includes a display data detected by the demodulator 2817 and the horizontal synchronization signal 2 superimposed on the power line 2827 as the second category information from the transmitting side. Based on 8 2 3, the display data signal 2 8 1 9, horizontal sync signal 2 8 0 0, vertical sync signal 2 8 2 1, and X driver X clock signal 2 8 2 2 It is generated and sent to the liquid crystal display for display.
- the modulation operation is performed only on the time axis, and most of the components can be realized only by a digital circuit that handles pulses, and it is easy to convert circuit elements into ICs.
- the adoption of short pulses increases the spread gain in the time direction, improving the anti-interference and interfering characteristics with the emitted radio waves, which is an essential function of the electronic device, as well as achieving multi-channel communication as a transmission line. be able to.
- the synchronization timing required for demodulation is superimposed on the power line 2827 and sent, eliminating the need for synchronization and reducing the number of wires, greatly reducing the circuit size. Can be simplified.
- FIG. 22 is a diagram illustrating still another embodiment of the electronic device according to the present invention.
- This embodiment exemplifies another method of superimposing the second category information on the power line in the if embodiment 14 to the cold embodiment 21.
- High-frequency information such as carrier waves as the second category information cannot be basically superimposed on the power line.
- An object of the present invention was to transmit wirelessly because such high frequency signals could not be transmitted successfully.
- the frequency of the second category information is too low, it cannot be superimposed on the power line. Even if they can be superimposed, separation will not be performed properly on the receiving side, or the voltage level of the power supply line will fluctuate, which will seriously affect the operation of equipment.
- the frequency of the second category information is so low, The signal is modulated and transmitted as shown in Fig.22.
- the second category information input to the input terminal 2901 is modulated by the modulator 2903 and transmitted to the superimposing circuit 2904.
- the superimposing circuit 2904 can be easily configured with a high-pass filter and a low-pass filter, similarly to the superimposing circuit 2115 shown in FIG.
- the carrier input to the modulator 2903 is oscillated by the carrier oscillator 292.
- the oscillation frequency is superimposed on the power line 295, and an appropriate frequency that does not affect the electronic device is selected.
- the carrier oscillator 292 may be, for example, means for dividing the frequency of a carrier wave for transmitting the 1 'category information by electromagnetic waves.
- the superimposition circuit 2904 superimposes the second category information on the power supply voltage supplied from the power supply terminal 2911 and sends it to the power receiving end via the power supply line 2905.
- Separation circuit 2906 separates the second category information, outputs the second category information to demodulator 2907, and supplies a power supply voltage from terminal 2912 to each part of the receiving unit.
- the demodulator 2907 demodulates the second category information.
- the demodulated second category information usually has a time delay due to demodulation, but this is corrected by the correction circuit 290 9.
- the carrier oscillator 2908 generates a carrier for demodulation, but if delay detection or the like is used, the carrier is not necessarily required for demodulation. In order to simplify the circuit, it is preferable to select a demodulation method in which the carrier oscillator 908 can be omitted.
- All such circuits can be incorporated on a semiconductor chip with the advance of semiconductor technology, and can be realized with almost no increase in cost.
- FIG. 23 is a diagram showing an example of still another electronic device using the information transmission method according to the present invention, in which a power supply line is used for data transmission between semiconductor chips.
- the semiconductor chip 310 2 is provided with a transmission circuit 300 1 having (generating) a plurality of data to be transmitted in the semiconductor chip 310 2, and the semiconductor chip 310 2 And a receiving circuit 3005 for receiving the data. It is assumed that data transmission is performed from the semiconductor chip 301 to the semiconductor chip 301.
- the control circuit 3003 starts so that the transmission circuit 3001 outputs data to be transmitted, and the multiplex circuit 3002 receives and multiplexes the transmission data from the transmission circuit 3001.
- the multiplexing uses parallel-to-serial conversion as described in the sixteenth embodiment and code multiplexing as in the nineteenth embodiment.
- the modulator 3004 receives the output of the multiplexing circuit 3002 and modulates it. It is transmitted as an electromagnetic wave signal by 10.
- the control circuit 3003 simultaneously generates multiplexing and modulation synchronization and other timing signals and carrier waves. Also, signals serving as carrier reference signals are generated using the method described in Embodiments 16 to 21, and these signals are passed through the power supply line 3014 by the superimposing circuit 3017 as the second category information and received on the receiving side. Is transmitted to the separation circuit 30 16.
- the separation circuit 3016 extracts the second category information from the power supply line 3014 and transmits it to the control circuit 3006.
- the signal propagated through the space (radio propagation path) 30 15 and received by the receiving antenna 3011 is demodulated by the demodulator 3008, and the signal multiplexed by the demultiplexer circuit 3007 is restored, and the signal is restored.
- the signal is sent to the receiving circuit 3005 for receiving.
- the control circuit 3006 multiplexes the multiplexed signal, the synchronization signal for modulation, other timing signals, and the reference signal of the carrier through the superposition circuit 310, the power supply line 3014, and the demultiplexing circuit 3016. Receive and demodulate ⁇ ⁇ Synchronize demultipletus and restore carrier wave used by demodulator 3008.
- the multiplexing, demultiplexing and modulation / demodulation circuits can be greatly simplified, and the The demand for precision is greatly relaxed, and all circuits on the semiconductor chips 301, 301, and 303 can be realized.
- the superimposing circuit and the separating circuit as in Embodiment 22 are used, data can be transmitted and received over the power supply line 3014 in a wide frequency range.
- FIG. 24 is a diagram showing still another embodiment of the electronic device using the information transmission method according to the present invention, in which data transmission using a power supply line is applied to a home theater.
- the home theater includes an image display unit 310, a tuner decoder unit 3101, and a speaker unit 3124.
- the image display unit 3105 has a built-in image display device and receives and displays an image signal.
- the speaker section 3 24 normally receives a plurality of speakers 3 1 1 1, 3 1 1 2, 3 1 1 3, 3 1 14, 3 1 15 and an audio signal for each speaker, and controls and amplifies the sound effect. And a driving part for driving the speed.
- the reproduction section 3102 of the tuner decoder section 3101 extracts image and audio data from an image and audio source such as a TV tuner and a DVD recorder according to a command from the control circuit 3120.
- Playback unit 3 102 outputs
- the multiplexed data is multiplexed by the multiplexing circuit 3103 for each image and audio channel.
- the multiplexing is performed by multiplying the spreading code generated by the spreading code generator 321 on a channel-by-channel basis in synchronization with the reference signal generated by the control circuit 3120, and performing analog addition of these multiplication results.
- the multiplexed data is modulated by the modulator 310, and transmitted from the transmission antenna 317 as first category information.
- the carrier oscillator 310 generates a carrier wave by multiplying the frequency based on the reference signal generated by the control circuit 310.
- the reference signal generated by the control circuit 3120 is superimposed on the power supply line 3116 by the superimposition circuit 3125 as the second category information, and is then transmitted to the W image display section 3105 and the speaker section 3124. Transmitted.
- this power supply line is an AC power supply, but the superposition circuit 3125 and the separation circuit 3126 are a low-pass filter and a high-pass filter as shown in FIG. Data.
- Terminals 3127 are power supply lines for supplying power to the tuner decoder 3101. Image data, text data, or audio data is transmitted as the first category information through the wireless propagation path 311 19, received by the receiving antenna 3118, demodulated by the demodulator 3107, and despreaded by the despreading circuit 311. Demultiplexing is performed by 08 to demultiplex, and only the image signal is extracted, and the extracted image data is stored in the display storage circuit 3110.
- the display image data stored in the display storage circuit 3110] is sequentially read out and displayed on the screen of the image display device incorporated in the image display unit 3105. Similarly, the information sent to the speaker sections 3124 is also copied in the same configuration as the inside of the image display section 3105.
- the reference signal transmitted as superimposed on the power supply line 3 1 16 as the second category information is separated by the separation circuit 3 1 2 6, and the control circuit 3 1 2 3 displays the image based on it.
- the carrier for demodulation is multiplied based on the control signal generated by the control circuit 3123, and the carrier oscillator 3106 oscillates.
- the spreading code generator 3122 used for despreading is controlled by the control circuit 3123, and generates a spreading code in synchronization with the reference signal sent as the second category information.
- the power line 3 1 1 5 is connected between the image display section 3 10 5, the tuner decoder section 3 10 1 and the speaker section 3 12 4. 6 only With this connection, a home theater can be constructed, and the configuration of the home theater is simplified. .
- FIG. 25 is a conceptual diagram showing a main part of still another embodiment of the electronic device according to the present invention.
- FIG. 25 it is assumed that data is transmitted from the transmission block 411 to the reception block 411.
- Information transmission is performed from the transmission circuit 4101 having the transmission information # 1 to the reception circuit 4104 receiving the information.
- the transmission information generated by the transmission circuit 4101 is encrypted by the encryption device 4114 using the encryption key held by the key buffer circuit 4103, modulated by the modulator 4102, and transmitted by the transmission antenna. Transmitted as an electromagnetic wave signal (radio wave) from 4110.
- the encryption key is generated by a key generation circuit 4116, and the generated key is sent to and held by a key buffer circuit 4103, and is transmitted through a wired path 4107, and a receiving block 4 It is stored in the key buffer circuit 4105 in 1 13.
- An electromagnetic wave signal emitted from the transmitting antenna 4111 and propagated in the space is received by the receiving antenna 4111, demodulated by the demodulator 4106, and decoded by the demodulator 4106. After being decoded by 115, it is output to the receiving circuit 410.
- the buffer circuit 4103 and the key buffer circuit 4105 continue to hold the ⁇ key that had been held until the key generation circuit 411 sent the encryption key. After the key rush circuit 4 1 1 6 has finished transmitting the encryption key, it updates the ⁇ key in synchronization with each other. Since the key generation circuit 4 1 16 updates the key frequently, the security is further improved.
- the key generating circuit 4116 is located in the receiving block 4113, and may be transmitted to the key buffer circuit 4103 in the transmitting block 4112 via the wired path 4107.
- the symbols used in the encryptor 4114 and the decryptor 4115 do not need to use a complicated algorithm such as public key cryptography. This is because the encryption key is transmitted over a short distance, such as within the same device, and by wired communication, so there is no fear that the encryption key will be stolen or tampered with when distributing the encryption key. This is because symmetric key cryptography can be used directly without any procedures.
- the wiring required for high-speed data transmission is eliminated, and various types of data generated with the speeding up of the operation of the electronic device are eliminated. Problems can be solved at once without compromising safety.
- FIG. 26 is a conceptual diagram showing a main part of another embodiment of the electronic device according to the present invention.
- data is transmitted from the transmission block 4 2 12 to the reception block 4 2 13.
- Information transmission is performed from the transmission circuit 4201 having transmission information to the reception circuit 4204 receiving the information.
- the transmission information generated by the transmitting circuit 4201 is obtained by adding a random number generated by a random number generator 4205 to an adder 4214, modulating the result by a modulator 4202, and From 10 is transmitted as an electromagnetic wave signal (radio wave).
- the random number generated by the random number generator 4 205 is also transmitted to the subtractor 4 2 15 in the receiving block 4 2 13 via the wired line 4 2 7 at the same time.
- the electromagnetic wave signal emitted from the transmitting antenna 4210 and propagating in the space is received by the receiving antenna 4221 and demodulated by the demodulator 4206, After being subtracted and decoded by the random number delivered from the random number generator 4 205 by the subtracter 4 2 15, the output is output to the receiving circuit 4 204. Since the addition in the Galois field (G F (2)) can be realized by a simple exclusive OR circuit, the configuration of the adder 4 2 14 and the subtractor 4 2 15 is simple. When the transmission circuit 4201 outputs serial data, the addition can be realized by simply taking an exclusive OR with a 1-bit random number.
- the random number generator 4 205 is in the receiving block 4 2 13, and may be transmitted to the adder 4 2 14 in the transmitting block 4 2 12 through the wired path 4 2 7.
- FIG. 27 is a conceptual diagram showing a main part of still another embodiment of the electronic device according to the present invention.
- data is transmitted from the transmitter block 4 312 to the receiver block 4 3 13.
- Information transmission is performed from the transmission circuit 430 having transmission information to the reception circuit 430 which receives the information.
- Transmission information generated by the transmission circuit 4301 is spread-modulated by the spread modulator 4302, and transmitted as an electromagnetic wave signal (radio wave) from the transmission antenna 4310.
- a spreading code used for spreading modulation is generated by a spreading code generator 4303.
- the spreading code generated by the spreading code generator 4303 is sent to the spreading code buffer circuit 4314 and stored. At the same time, the spreading code generated by the 'spreading code generator 433' is also sent to and stored in the spreading code buffer circuit 433 of the receiving block 433 via the wired line 433.
- Spreading modulator 4302 spreads and modulates transmission information using a spreading code stored in spreading code buffer circuit 4314.
- the electromagnetic wave signal emitted from the transmitting antenna 4310 and propagating in the space (wireless propagation path 4308) is received by the receiving antenna 4311, despread by the demodulator 4306, and received. Output to circuit 4304.
- the spreading code used for despreading is the same as the code that was spread-modulated during transmission and used at the same timing.
- the two spreading code buffer circuits 4 3 1 4 and 4 3 15 are controlled to operate synchronously for that purpose.
- the spreading code generator 4 3 0 3 is located in the receiving block 4 3 13, and it can be sent to the spreading code buffer circuit 4 3 1 4 in the transmitting block 4 3 12 via the wired path 4 3 07. good.
- the spreading code can be freely generated at any time by the spreading code generator 4303.
- the changed spreading code is always synchronized between transmission and reception by the operation of the two spreading code buffer circuits 4 3 1 4 and 4 3 15, and tracking is maintained, so the spreading code can be changed at any time as needed. it can. Also, very long spreading codes can be used.
- the data inside the electronic device is spread-encoded and wirelessly transmitted, thereby eliminating the wiring required for high-speed data transmission, and reducing various problems caused by the high-speed operation of the electronic device. It can be solved at once without compromising safety.
- FIG. 28 is a view showing still another embodiment of the electronic device according to the present invention.
- the electronic device is divided into a main body portion 4405 and a display portion 4412, and is integrated via a hinge 4407.
- the display data generated by the liquid crystal controller 4408 is added to the random number generated by the random number generator 4413, sent to the modulator 4400 and modulated, and transmitted from the transmission antenna 4409. It is converted into electromagnetic waves (radio waves) and propagates through space.
- the electromagnetic wave signal transmitted from the transmitting antenna 4409 is received by the receiving antenna 4410, demodulated by the demodulator 4402, and then a random number added at the time of transmission by the subtractor 4414 is obtained. It is subtracted and restored to the display data.
- the display data is sent to the LCD driver 4401 and displayed on the LCD 4444.
- the random number generated by the random number generator 4 4 13 is transmitted to the subtractor 4 4 1 4 through the wired path 4 4 1 1. Since a low rate of this signal is sufficient compared to the transmission data rate, and the number of necessary signal lines is small, it is easy to wire through the hinge 4407. In addition, the degree of freedom in wiring and component arrangement is increased, as shown in the figure. As shown in FIG. It is also possible to arrange the antenna 4401 at a position S from the hinge 4407. In addition, restrictions on the placement of parts are reduced, and the degree of freedom in design for improving the design and usability of equipment is greatly increased.
- FIG. 29 is a block diagram of a main part of an embodiment of the data transmission and electronic device according to the present invention.
- the CPU 4501 controls the entire electronic device and displays it on a display using the decompression of compressed image data such as MPEG and JPEG and the image data captured by the image sensor.
- the liquid crystal controller 4503 reads the display data 4.525 from the video memory 4502 in accordance with the driving order of the liquid crystal display 451, and the horizontal synchronizing signal of the liquid crystal display 451 '. 4 5 2 3, Output to the logic circuit 4 5 0 4 together with the vertical synchronization signal 4 5 2 4.
- the logic circuit 4504 performs a parallel conversion of the display data 4502 and rearrangement of data such as a preamble addition to construct a communication packet.
- the primary modulator 450 modulates this signal with a pulse train generated by the pulse generator 4506.
- pulse position modulation or biphase pulse modulation for a pulse train can be used.
- the signal that has undergone the primary modulation is spread-modulated by the spread modulator 4507 with the spread code generated by the spread code generator 4508.
- the spread-modulated pulse train is shaped into a very short pulse by a pulse shaping circuit 4509 so as to become a broadband pulse with a low spectral density, and then transmitted by a transmitting antenna 4501.
- the radiated field is not a sine wave modulated but a very narrow pulse train.
- the radiated electromagnetic wave is received by the receiving antenna 4511 through the radio propagation path 4526, and is amplified by the preamplifier 4512 as necessary.
- the correlation with the pulse template generated by the pulse generator 4 5 13 is calculated.
- the output of the correlator 4515 is despread by a despreading circuit 4515 by a spreading code sent from a spreading code generator 4508 through a wired path 4527, and then demodulated.
- the signal is demodulated by the modulator 415 and converted into a signal before the primary modulation (communication packet composed of the logic circuit 454).
- Logic circuit 4 5 1 8 is a display data signal 4 5 9 for driving the LCD driver from the communication packet restored by demodulator 4 5 7 7, horizontal synchronization signal 4 5 2 0, vertical synchronization signal 4 Generates 5 2 1 and X driver 4 clock signal 4 5 2 2 and sends them to the liquid crystal display for display.
- the spreading code required for despreading is sent from the transmitting side via the wired path 452 7, so there is no need to have a spreading code, and it is not necessary to acquire synchronization for despreading.
- the circuit is greatly simplified.
- the leaked electromagnetic wave itself has an extremely weak spectral density, and it is essentially difficult for a third party to intercept it without noticing it.
- the spreading code since the spreading code is transmitted to the receiving side through the wired path 452 27 in the closed space inside the electronic device, the spreading code cannot be known by a third party. Furthermore, the spreading code can be changed at any time. Therefore, safety is further improved. For this reason, it is possible to avoid various conventional problems associated with speeding up data transmission to the liquid crystal display unit 451, while maintaining high security with little increase in cost.
- FIG. 30 is a block diagram showing a main part of an embodiment of an electronic device according to the present invention, showing an example in which the information transmission method according to the present invention is applied to an electronic device using an image sensor.
- the image sensor 460 1 is activated by a horizontal synchronizing signal 460 and a vertical synchronizing signal 462 generated from a control circuit 460 2, and converts the captured image data 461 9. Output.
- the logic circuit 4603 receives these signals to construct a packet for wireless transmission.
- the packet is encrypted by the encryptor 4604, modulated by the modulator 4605, and radiated from the transmitting antenna 4607 as an electromagnetic wave.
- the key used for the symbol is generated by the key generation circuit 460 and is simultaneously transmitted to the key buffer circuit 466 in the transmission side and the input buffer circuit 461 in the receiving side.
- the key buffer circuit 4606 and the key buffer circuit 4611 output the ⁇ key to the encryptor 4604 and the decoder 4 613 in synchronization with both transmission and reception, respectively, and the decryptor 4 6 1 3 works so that it can decode correctly.
- the key is transmitted from the key generation circuit 4615 to the key buffer circuit 4611 on the receiving side via the wired path 4623.
- the electromagnetic wave signal transmitted from the transmitting antenna 4607 propagates through a wireless propagation path (space) 4622, is received by the receiving antenna 4608, and is amplified by the preamplifier 4609. Unnecessary out-of-band signals are removed by the bandpass filter 4610 and demodulated by the demodulator 4612. The demodulated signal is decrypted by the decoder 463 and sent to the serial-parallel conversion circuit 416.
- the serial-to-parallel conversion circuit 4614 extracts the image data portion from the central part of the demodulated received packet, and performs serial-to-parallel conversion for each pixel to generate pixel data.
- the logic circuit 4616 generates a memory address for writing to the video memory 4617 in accordance with the demodulated pixel data, and the image data is directly or via the CPU 4618 to the video memory 4161. Write to the address of 7.
- the CPU 4 6 18 accesses the video memory 4 6 7 and uses the image data for various applications.
- the key generation circuit 4 6 15 is placed on the data transmission side.
- the key buffer circuit 4 6 0 6 on the transmission side passes through the communication path 4 6 2 3. The same effect can be obtained by sending to
- the above configuration that is, encrypting data transmission from the imaging device 4601, and wirelessly transmitting the data, has become more obvious as the size of the imaging device 4601 increases, increasing power consumption and wiring positions.
- Various problems caused by wired transmission such as restrictions on EMI, EMI problems, and reliability degradation, can be eliminated without sacrificing security.
- FIG. 31 is a conceptual diagram showing a main part of still another embodiment of the electronic device according to the present invention.
- a transmission block 470 1 2 having information to be transmitted is provided in the transmission block 471 12, and a reception circuit 4 71 which receives the transmission information is provided in the reception section 470 13. 704 is provided. Then, it is assumed that data is transmitted from the transmission block 471 2 to the reception block 473.
- the transmission data generated by the circuit 470 1 is subjected to confidential processing by the confidential circuit 470 3, modulated by the modulator 470 2, and transmitted as an electromagnetic wave from the transmitting antenna 470.
- the secret circuit 4 7 0 3 also generates a secret code and superimposes the secret code on the power supply line 4 7 7 by the superimposition circuit 4 7 15 and sends it to the receiving block 4 7 13 via a wire together with the power voltage. Transmit a signal.
- the secret code corresponds to a random number, an encryption key, or a spreading code.
- An electromagnetic wave signal carrying transmission data which is emitted from the transmitting antenna 4710 and propagates in the space (wireless propagation path 4708), is received by the receiving antenna 4711 and demodulated by the demodulator 4706.
- the signal is demodulated and output to the decoder 4705.
- the decoder 475 uses the confidential code superimposed on the power supply line 407 and transmitted by wire and separated by the separating circuit 470 to remove the confidential processing imposed on the received data, and decodes it.
- the signal is transmitted to the receiving circuit 4704.
- the data may be transmitted from the data receiving block 471 13 to the transmitting block 471 2.
- the confidential code is generated on the receiving block 471 13 side
- 471 4 is a superimposing circuit
- 471 5 is a separating circuit.
- the confidential code is superimposed on the power supply line 470 7 together with the power supply voltage, and is transmitted and received between the transmission block 471 2 and the reception block 471 13.
- the power supply 4 7 16 supplies the power supply voltage to all the circuits in the transmitter block 4 7 1 2, and the secret code generated by the secret circuit 4 7 0 3 is superimposed by the superposition circuit 4 7 Superimposed on 7. Details of the inside of the superimposing circuit 4715 are shown in a dashed line 4717.
- Terminal 472 8 is connected to power supply 471 6 and terminal 472 9 is connected to power supply line 407.
- the confidential code generated from the confidential circuit 740 3 is superimposed on the power line 470 7 from the terminal 4 725 through the high-pass filter 472 4.
- the signal of the confidential code superimposed does not leak to the terminal 4728 by the low-pass filter 4727, so that all circuits of the transmitter block 4712 operate correctly.
- the secret code superimposed on the power line 470 7 is separated by the separation circuit 471 14 and transmitted to the decoder 475.
- the inside of the separation circuit 4 7 1 4 within the chain line 4 7 1 8 will be described in detail.
- Terminal 472 1 is connected to power supply line 470 7.
- the signal of the confidential code input to the terminal 472 1 is separated by the high-pass filter 472 3 and transmitted from the terminal 470 to the decoder 470.
- the low-pass filter 4 7 2 2 prevents leakage of information of the confidential code being superimposed, so that only the energy supplied from the power supply 4 7 12 is transmitted from the terminal 4 7 1 9, and the terminal 4 7 1 Supply the power supply voltage correctly to all the circuits in the receiver block 4 ⁇ 7 1 3 through 9.
- the secret code is sent from the receiver block 4 7 13 to the transmitter block 4 7 12, the functions of the superposition circuit 4 7 15 and the separation circuit 4 7 1 4 are reversed.
- each circuit configuration may be the same.
- the secret code used for maintaining the safety of the signal transmitted wirelessly is transmitted by being superimposed on the power line, so that the signal exchange in the electronic device can be performed with a minimum number of wires. It is possible to realize a highly reliable and safe electronic device by a simple method.
- FIG. 32 to FIG. 39 are diagrams showing an embodiment of the timing of wired communication and wireless communication.
- data is transmitted wirelessly between circuit blocks, and a synchronization signal is simultaneously transmitted between these circuit blocks via a wire.
- the synchronization signal when bidirectional communication is performed between circuit blocks, the synchronization signal may be transmitted bidirectionally by wire, but while synchronizing with the synchronization signal transmitted in one direction.
- One wireless communication may be performed.
- data may be transmitted between circuit blocks using both wired and wireless communication.
- control information for wireless communication may be sent by wire.
- the transmission start notification and the encryption key may be transmitted by wire, and the wireless communication may be started in response to the transmission start notification and the symbol key.
- the additional information may be notified ferociously.
- the wireless communication control information is sent by wire, the No. key is transmitted by wire, the No. key is confirmed by wire, and then the wireless communication is started. You may do it. Also, the control may be confirmed without confirming the encryption key.
- the encryption key may be changed for each wireless communication frame.
- the encryption key may be confirmed by wire, or the transmission end notification may be performed by wire.
- a wireless communication frame refers to a period from the start of one wireless communication to the end of the wireless communication.
- the present invention is not limited to the above-described embodiment, and can be applied to a wide range of applications such as connection of a storage device such as a hard disk drive built in an electronic device to a CPU.
- a storage device such as a hard disk drive built in an electronic device
- a CPU a central processing unit
- various problems and mounting problems can be eliminated, and a low-cost, high-reliability, low-power-consumption electronic device can be realized. ''
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Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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EP05704347A EP1715595A1 (en) | 2004-01-26 | 2005-01-26 | Information transmission system, electronic apparatus, and wireless communication terminal |
Applications Claiming Priority (8)
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JP2004-017259 | 2004-01-26 | ||
JP2004017259A JP3952022B2 (ja) | 2004-01-26 | 2004-01-26 | 電子機器における情報伝送方式および電子機器 |
JP2004022265A JP3755530B2 (ja) | 2004-01-29 | 2004-01-29 | 電子装置 |
JP2004-022265 | 2004-01-29 | ||
JP2004026732A JP3711457B2 (ja) | 2004-02-03 | 2004-02-03 | 電子機器 |
JP2004-026732 | 2004-02-03 | ||
JP2004246359A JP3711458B1 (ja) | 2004-08-26 | 2004-08-26 | 無線通信端末 |
JP2004-246359 | 2004-08-26 |
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EP (1) | EP1715595A1 (ja) |
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Also Published As
Publication number | Publication date |
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KR20080017329A (ko) | 2008-02-26 |
KR100854216B1 (ko) | 2008-08-25 |
US20090270037A1 (en) | 2009-10-29 |
TW200534655A (en) | 2005-10-16 |
KR20060107573A (ko) | 2006-10-13 |
US20050162338A1 (en) | 2005-07-28 |
EP1715595A1 (en) | 2006-10-25 |
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