JPH05505070A - Carrier modulation without sidebands - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Carrier modulation without sidebands field of invention The present invention relates to radio frequency modulation and transmission of information. In particular, the present invention applies to all common The form RF modulation method and apparatus further provides a method and apparatus for amplitude variation without producing sideband information. The present invention relates to a method and an apparatus for conducting a test.

Background of the invention Wireless communication involves transmitting and receiving modulated radio frequency (RF) electromagnetic signals. This is achieved by Modulation is the modification of certain characteristics of a carrier wave based on the signal being carried. It is a process of changing gender. An RF carrier is a known standard It is an electromagnetic wave that has at least one characteristic changed from its state. What is a modulator? , the RF carrier and the modulated signal are combined to produce the modulated carrier. input to a circuit or device, or a circuit or device in which the modulated signal is processed and modulation is performed. It is something to do. Demodulation is a process to obtain the original modulated signal from the modulated carrier wave. It is a process. The carrier wave for radio frequency transmission is known as the Eiquist frequency. The signal is characterized in that the frequency is at least twice the frequency of the modulating signal.

In the prior art, various modulation methods are known for applying a modulating signal to a carrier. Ru. The modulating signal may be of analog type, such as speech or music, or Dental data, digitized analog signals and other digital data It is a dental type.

In the prior art, sidebands are always generated during modulation of an RF carrier. side wave A band is a frequency band on both sides of an RF carrier; A baseband signal that changes certain characteristics (before modulating the carrier wave, Occupied frequency range). In the conventional modulation process, two side waves In other words, upper sideband (USB) and lower sideband (LSB) are generated. Ru.

The width of each sideband is typically equal to the highest frequency component in the baseband signal.

In prior art modulation systems, the width of the sidebands is the highest baseband frequency required. It can significantly exceed the original value. USB and LSB are mirror images of each other and are the same. carry information. A modulation system consisting of transmitting only one sideband while transmitting the other For the other sideband, it may be partially or completely suppressed to maintain the bandwidth. control The occupied bandwidth is determined by the total average power (for communication As stated in the FCC rules of the United States), approximately 05% of - cents (minus 20 dB) between the upper and lower limits of the signal. is the frequency of This bandwidth can be measured with a spectrum analyzer. It can also be calculated using the mathematics of information theory. Bandwidth required ensure that the occupied portion of the bandwidth is sufficient to transmit information at the desired speed and quality. It's about being a minute.

There are several main modulation systems used to transmit information via radio frequencies. Ru. These modulation systems are classified based on the modulation method of the primary RF carrier. Ru. The main things are: 1. ) Amplitude modulation (AM), 2. ) and frequency modulation (F M) angular modulation comprising; and 3. ) Pulse amplitude modulation (PAM) and pulse Width modulation (PWM), pulse width modulation (PDM), pulse position modulation (PPM), There are pulse modulations including pulse phase modulation and the like. The oldest and most common carrier modulation method It is definitely amplitude modulation.

Amplitude modulation (M to 4) is a modulation system in which the amplitude is the characteristic to be varied. The scope of application is the field. This is the capacitance from zero output level to peak output level. It is explained as changing the rear amplitude.

In the prior art, the amplitude modulation process is based on heterodyning or nonlinear mixing. This process creates sidebands on one side of the carrier frequency generated by the switching process. advance In technology, an RF carrier and a baseband modulated signal are combined to generate an RF frequency Three products occur in the number range: (1) carrier frequency, (2) lower side waveband (LSB), and (3) upper sideband (USB). In this way, For example, a 10 megahertz (fc) carrier is a 1 kilohertz sine wave (fm). Once modulated, the result will be as shown in FIG. In this example, the modulated signal The bandwidth of is 2 kilohertz, and the difference between the lowest frequency and the highest frequency (fLSB - fUSB). In AM, the difference between the carrier and the farthest sideband component is the baseband modulation The highest frequency component contained in the signal! = determined accordingly.

There are only a limited number of carrier frequencies available for transmitting and modulating information. Medium wave (early called ether), this limited public resource is distributed equally and fairly. regulated by governments around the world. Congregation 1's FCC Allocating and using RF carrier frequencies to prevent carriers from colliding with each other. use was regulated. Demand for modulation frequencies for commercial applications far exceeds supply. Therefore, the use of airwaves cannot be permitted for all demands.

Therefore, in the prior art, it is not possible to reduce the consumption of spectrum for each RF modulated signal. In order to carry as much information as possible while suppressing the It is necessary to aim for effective utilization. Therefore, in the prior art, the minimum amount of What is needed is a modulation system that uses code width. In addition, in the prior art, Reduce or eliminate upper and lower sidebands from width modulated signals to improve key It is necessary to ensure that the width of the carrier signal is the width required for transmitting the amplitude modulated signal. be.

In addition, in the prior art, there are various methods for effectively utilizing the available communication spectrum. Accurate and effective method for generating multiple carriers modulated by various modulation formats. line communication equipment is required. In the prior art, furthermore, worldwide wireless communication Modulate the carrier using various modulation formats based on digital signal processing for There is a need for a transmitter and receiver that can perform and demodulate.

Not only the above-mentioned drawbacks, but also the drawbacks of the prior art can be easily understood by a person skilled in the art. As can be seen, the present invention has many advantages as disclosed in the specification and drawings. This problem has been solved by the present invention.

Summary of the invention The present invention uses various modulation techniques derived from communication processing systems to The present invention relates to a method and apparatus for performing line frequency modulation. In particular, the present invention provides an amplitude signal having no sidebands. A method and apparatus for generating a modulated carrier signal. carrier signal The amplitude can only be changed at the zero crossing of the carrier signal, so no sidebands occur. An amplitude transition occurs at . Amplitude modulated carriers are digital amplitude modulated, or digital digitized analog signals (audio, video, 7x, etc.) or other types of digital signals or digitized modulated signals (ternary signals, serial signals) (parallel digital data, parallel digital data, etc.). frequency domain In the region, an RF carrier signal that purely changes only the amplitude without changing the frequency can be obtained. It will be done.

The present invention retrieves a dental representation of a sine wave from read-only memory (ROM). The present invention relates to a method and apparatus for storing data. To the memory page of the digital representation of the sine wave The memory is a sine wave data file with each page in memory having the same period at a different amplitude. This is done in such a way as to include an instrumental expression. High-speed reading of a digital representation of a sine wave The digital representation read using a digital-to-analog converter is Filtering digital representations by converting them from digital to analog representations Or smooth it for a pure analog representation and use antenna wires, optical fibers, or is a perfect sine wave R by emitting RF through microwave communication. An F carrier signal is generated. Read the digital representation of the sine wave at the first amplitude , followed by the dental representation of the sine wave at the second amplitude. By continuously reading the digital representation of a sine wave that has no sideband components, A complete amplitude modulated RF multiplied signal is generated, right? The second digital representation is the zero crossing point Follows the first digital expression only.

In the simplest device, by rarely using the first and second amplitudes, digitally modulated. An AM carrier signal is generated.

By providing many pages of digital representations of sine waves at multiple amplitudes, A digitized analog signal (speech or music, etc.) is converted into a carrier with a digital amplitude change. It can be used in different ways.

By varying the speed at which the digital representation of the sine wave is read from read-only memory. Therefore, the RF carrier frequency can be changed.

By adjusting the speed at which the digital representation of the sine wave is read, the frequency of the RF carrier can be adjusted. Wave number modulation can be performed. However, frequency modulation produces sidebands. Special Using a digital modulation signal to select a page of constant amplitude sine wave digital representation and by adjusting the reading speed of the digital notation. A combination of width and frequency modulation occurs.

The invention also relates to amplitude modulation, frequency modulation, amplitude and frequency modulation, and other modulations. The present invention relates to a method and apparatus for implementing the techniques using the same digital signal processing circuit.

The present invention also provides digital modulation of analog carriers and digitally generated carriers. by analog modulating the carrier and analog modulating the analog carrier. The present invention relates to a method and apparatus for generating an amplitude modulated carrier signal having no waveband. Carry Since the amplitude of the carrier signal can only be changed at the zero crossing of the carrier signal, All amplitude changes occur without sidebands. As a result, the frequency changes Instead, an RF carrier signal is obtained that varies purely in amplitude over a frequency range.

In the following drawings, similar parts are numbered similarly.

FIG. 1 shows the time and frequency ranges of amplitude modulation according to the prior art.

Figure 2 shows the time domain and frequency in which sidebands do not occur in amplitude modulation according to the present invention. Indicates wave number range.

FIG. 3 is a block diagram illustrating a non-lateral skin band amplitude modulator according to the present invention.

Figure 4 shows a read-only memory containing a digital representation of the sine wave in the first amplification. This is a graph representing a bit memory map for one page.

Figure 5 shows a read-only memory containing a digital representation of the sine wave in the second amplification. This is a graph showing a bit memory map for one page and seven minutes.

Figure 6 shows the frequency range of three closely spaced RF carrier amplitude modulations without sidebands. be.

FIG. 7 is a block diagram of a combined amplitude modulator and frequency modulator circuit.

FIG. 8 shows that 7 ': is a block diagram of a digital signal processing circuit that generates RF signals.

FIG. 9 shows a communication system using the present invention that transmits and receives ZSRAM through its own E space. FIG.

Figure 10 shows how - as an example - fist per channel - via satellite communication using a carrier. FIG. 2 is a block diagram of a communication system using the present invention that transmits and receives ZSBAM. .

FIG. 11 shows the present invention transmitting and receiving ZSRAM via terrestrial fiber optic communication. It is a block diagram of the communication/system used.

Figure 12 shows a system using the present invention to transmit and receive ZSB and AM via terrestrial wired communication. FIG. 2 is a block diagram of a communication system.

Figure 13 consists of pages with dental representations of sine waves at different amplifications. , is an example of a page memory map having m pages of sine wave dental notation. .

Figures 14 to 18 show details of the circuit for implementing carrier modulation without sidebands. FIG.

Figure 19 shows a digitally generated key for carrier modulation without sidebands. 1 is a block diagram of a communication system implementing analog modulation of carriers; FIG.

Figure 20 shows analog iRF carrier modulation for carrier modulation without sidebands. FIG. 2 is a block diagram of a device that performs digital modulation of the first embodiment;

FIG. 21 shows that by analog modulation of an analog RF signal source, keying is achieved without sidebands. 1 is a block diagram of a device for carrier modulation; FIG.

Figure 22 shows an analog RF carrier for carrier modulation without sidebands. 3 is a block diagram of different embodiments of an apparatus for digital modulation; FIG.

FIG. 23 shows that by analog modulation of an analog RF signal source, keying is achieved without sidebands. 2 is a block diagram of different embodiments of an apparatus for carrier modulation; FIG.

Detailed Description of the Preferred Embodiment In the detailed description of the preferred embodiments set forth below, which constitutes a part of the illustrative embodiments, Reference is made to the accompanying drawings in which certain embodiments of the invention are illustrated. Implementation of these Examples are described in sufficient detail to enable one skilled in the art to practice the invention. It has been made clear. It is also possible to implement separately from these detailed examples, and , without departing from the scope of the invention, there may be structural, electrical, or other modifications to these embodiments. Or you can make necessary changes. Therefore, the detailed description given below is limited. The scope of the present invention is not to be construed as This is what is specified.

In FIG. 1, a non-modulated key with a time range and a frequency range according to the prior art is shown. It shows career. In the frequency range, the carrier of constant frequency fc of the sine wave yields a unique vector on the frequency spectrum. The modulation signal is also a frequency yields a unique vector frn on the vectors. The modulated carrier is It is obtained by mixing the carrier and the modulation signal or by heterogaining. frequency range The energy spectrum shown in the box shows the carrier frequency fc and the carrier frequency fc. An upper sideband f is located at a position shifted from the frequency fc by the magnitude of the maximum frequency of the modulation signal. It produces two nanovectors in usb and lower sideband f lsb. This publicly known When transmitting a radio frequency modulated carrier using technology, both carrier frequencies are Enough bandwidth to transmit, and less (both in one sideband) must be assigned. As a result, in order not to interfere with free calls, Other radio frequency carriers must be separated from fc by at least ftn. stomach.

Figure 2 shows a simplified modulated carrier for amplitude modulation without sidebands. There is. Two levels A and B are shown as modulation signals. time range One sine wave has a period corresponding to the carrier frequency fC. carrier frequency The number is fixed at fc, and each sine wave is varied to be at level A or B. will be adjusted. The amplitude signal in this time range varies between levels A and B. , the frequency never changes because the amplitude changes at the zero crossing point of the carrier signal. . The energy spectrum in this frequency range is shown in Figure 2. The wavenumber energy changes between points A and B. Amplitude switching is frequency occurs at the zero crossing of the energy spectrum, so other frequency elements in the energy spectrum are missing, the superior and inferior lateral bands have been excluded. More details below For this modulation signal, at most 1/2 of the carrier frequency is selected so that . This value is the maximum modulation frequency at which the modulation signal can be demodulated during demodulation. below As discussed in more detail, the maximum frequency of the modulating signal is the maximum frequency of the demodulating signal of the original modulating signal. In order to do this accurately, it is preferable that it is not greater than 10% of the carrier frequency.

When the carrier frequency is the center frequency fc in Figure 2 and there is no sideband, the interference is Multiple carrier frequencies can be located very closely together without any interference.

These are pure amplitude modulated carriers with no sidebands, so the available It is extremely efficient as it effectively uses the communication spectrum. More detailed below. Pack amplitude modulated carrier frequencies closely together in the communication spectrum to The key points are the digital resolution in the modulation circuit, the equipment used and the demodulation circuit. limited only by the tolerance of Experimental results show that the carrier frequency is It is possible to be located as close as 200 Hz to any high frequency carrier. It has been shown that this can be done.

Denotal modulation of a digitally generated carrier FIG. 3 shows a preferred implementation of the present invention. 1 shows a block diagram of an example sideband-free amplitude modulation circuit; FIG. Key elements of this circuit is a read only memory (ROM) 304. ROM304 is at least It also contains two digital representations of sine waves. Two digital representations have the same point The first digital representation of the sine wave contains The amplitude peak is different from the sine wave of the second digital representation. ROM memory location header When mapping the digital representation, the first digital representation with the first amplitude is R O! It is convenient to write it so that it is located within the first page of vI 304. No. A second digitally represented sine wave with an amplitude of 2 is stored in the second page of memory. It is convenient to write it as if it were located.

A digital modulation signal 312 is provided to the circuit and generated by conventional means. example For example, a digital modulated signal is a multi-bit wide signal digitized with a γ-dio signal. , PCM data, binary serial data, etc. In order to simplify Figure 3, The digital modulation signal is assumed to be a serial focus stream with a single focus of 0 and 1. ing.

The digital modulated signal 312 is transmitted to either the first or second page within the ROM 304. Select force. For example, line 312 of the dental modulation signal has a first amplitude. Select the first page with the first digital representation of the sine wave. similarly , the digitally modulated signal line 312 has a second digital representation having a second amplitude. Select the second page that displays the sine wave. To select between pages, press latch 305. This launch then becomes the base for the B address line of ROM 304. address.

In the lunch 305, the selected last page is completely read from the ROM 304. Prevents the next page from being selected until the next page is selected. This action triggers latch 305. The zero crossing detector 306 is implemented by the

The A address of ROM304 is the digital sine wave in the selected page. select individual bits for If address A of ROM 304 is selected If the selected page increases continuously through all addresses in the selected page, The digitally represented sine wave for Ichino is the data output line 31 of the ROM 304. 3 is output continuously. The data output line 313 is a digital data output line. Outputs several bit words, each word representing a specific value in the digitized sine wave. Represents amplitude level in time.

FIG. 4 shows a simple digital representation of a sine wave with a specific amplitude. this sign Waves are not drawn to scale (16-bit peak-to-peak amplitude resolution and and 16-bit periodic resolution), used for illustrative purposes only.

Referring to FIG. 4 in conjunction with FIG. 3, the digital representation of the sine wave in FIG. Included within one page of 04. The digital representation of the sine wave in Figure 4 is ROM3Q 4 indicates the memory address within the selected page. The amplitude of each specific bit is , indicated by the multi-bit word at the aforementioned address.

For example, address 0 is the point of time 0 in the digital representation of the sine wave in Figure 3. Indicates the The amplitude at time 0 is 0, which means that the address O of the ROM 304 The multi-bit word selected from (indicates the zero cross of A).

The next address that appears at address A is 0001, which is the data in ROM304. An amplitude value of 0011 is output on the data output line 313. As a result, ROM30 4, continuously from address oooo to address 1111 on the hair address line The stethop asob is along the horizontal axis of the digitally represented sine wave in Figure 4. Move between! :Respond. Each consecutive address is selected on the hair address line. When a parallel word of multiple bits representing the amplitude of the sine wave appears on the data output line. Output to In. This multi-bit word on data output line 313 is , used to drive the digital/analog converter 307. digital work When a code is applied to the input of the digital-to-analog converter 307, the output of the digital-to-analog converter 307 is Outputs a step-up analog voltage representing the dental input value. Digital The output of the /analog converter 307 is guided to a smoothing filter 308, and the output of the analog converter 307 is Transform stepwise changes into smooth sinusoidal signals. The signal output from the filter 308 is It is fed to an RF amplifier 309 and then transmitted by an antenna 310.

The page switching performed by the digital modulation signal 312 is performed by the digital description support. In order to ensure that the in-wave occurs at the zero-crossing point, the zero-crossing detection circuit 306 used to control latch 305, thereby controlling data output line 313. When the sine wave in digital notation is read out, the new page address will be displayed. is output. Zero cross detection circuit monitors 0 data on output line 313 It may also be a comparator that This O data also corresponds to the half period in Figure 4. In other words, it means a signal that passes through the O axis in one cycle. Zero cross detection circuit 306 It is a sine wave change detector based on a logic circuit or a ROM in which its functions are written. It's okay.

Figure 5 shows a sine wave in digital representation with a different amplitude from the sine wave in digital representation in Figure 4. Shows a sine wave. The sine wave in digital notation in Figure 4 is the first memo in ROM304. The digital representation of the sine wave in FIG. 5 is in the ROM 304. in the second memory page of . Between sine waves in digital representation in Figures 4 and 5 In this case, a difference in amplitude is observed for the same address. This allows digital transformation. When the key signal 312 selects the first key, the amplitude peak of the digitally represented sine wave The arc reaches the digital value 0111 in the positive period sine wave at address 0100. are doing. In contrast, the O value on the digital modulation signal line 312 is as shown in FIG. This figure 5 shows the regular period at address 0100. It has a lower digital value of 0101 on the digital notation sign.

The RF ratio output from the circuit in Figure 3 is the carrier frequency of the carrier frequency, and the digital output in Figure 4 is The peak amplitude of the sine wave in square notation, or the sine wave in differential notation in Figure 5. has a peak amplitude corresponding to the peak amplitude emitted. The cutting edge is dental modulation. Depending on the value of signal 312, the sine wave of FIG. 4 or FIG. 5 is selected. sine wave The selection of the carrier occurs only at cellocrossing, so never changes.

Referring again to FIG. 3, additional blocks will be described. ROM304 A add Is the response continuous from address oooo to address 1111? = Assuming two steps did. , the speed at which the address lines step continuously is determined by the speed at which the antenna 31 Determine the carrier frequency to be transmitted from 0. However, the continuation at A address The carrier frequency can be changed by changing the speed of the carrier. The register 303 is It is timed by a master clock that controls the carrier frequency of the base.

The carrier frequency, however, is stored in the carrier frequency register 301. This can be changed by selecting a value that is not. If the carrier frequency register If the data contains a 1 value, that value is added to the output of register 303. phase addition The output of the device 302 is controlled to the register 303 as follows. That is, the phase addition A feedback loop between the calculator 302 and the register 303 causes the master clock 311 to The register 303 is incremented every time the clock is counted. In this method, register 3 03 accesses the A address of ROM 304 by addressing the selected page. step.

However, if the carrier frequency register 301 contains a value of 2, then the position The phase adder 302 supplies clock signals to the register 303 from the master clock source 311. Increment by 2 every time a lock signal is received. This allows this method Now, by addressing the selected page, carrier frequency register 3 A binary value within 01 increases the A address by two steps. This allows for career The wave number is doubled, and the original frequency is transmitted to the ROM 304 during one sine wave. Step by 2x. Increase the value in carrier frequency register 301 Then, the effective carrier frequency output to the antenna 310 is increased.

In the Western movie explanation of the preferred embodiment so far, in the two pages of the ROM 304 A simplified example of a sine wave in digital notation is shown below. Preferences of the present invention In an alternative embodiment to the preferred embodiment, the A address is 8 bits, so that 256 increments for the digitally represented sine wave shown in Figures 4 and 5. Enable clients to A wide range of carriers, as readily understood by those skilled in the art. Larger A addresses are preferred for frequency coverage, e.g. 16 bits. At the address of 65.536 increments are possible, and with a 16-bit B address, , 65.536 amplitude changes (vanes). Also, preferred implementation of the present invention In the example, register 303 is a 30-bit register; Only the most important 8 bits are used to drive the A address on ROM 304. Ru. In this method, register 303 has a large value in carrier frequency register 301. increments a new value, but the most significant bit of the 30-bit register is not used. control over changes in carrier frequency is achieved.

In another embodiment of the preferred embodiment of the present invention, a 256-page digital representation site is provided. The ROM 304 contains the signal. It has a sine wave with digital representation on page 256. This allows 256 different amplitude levels. As a result, the B address becomes 8 bits. This allows one to be selected from 256 pages of memory. Ru. In this method, the digitally modulated signal 312 is ultimately an 8-bit word. indicates one of the 256 values of the analog signal. Analog signal to digital modulation signal Digitization is known to those skilled in the art.

One of the various applications for the sideband-free amplitude modulation system of Figure 3 is the compact device Digital transmission of digital audio signals in the type found on discs There is. There are many variations of transmission techniques using the preferred embodiment of the invention. −Example As for the digital modulation signal 312, the 16-bit parallel word value is is to use. This 16-bit word value is corresponds to one 16-bit value of the stereo digital signal from. CD player The output directly drives the digital modulation signal for the preferred embodiment shown in FIG. When used for direct recording of encoded music from a CD onto an AM carrier with no sidebands. can be sent to. For accurate resolution, multiple amplitudes of the sine wave can be generated. A high resolution digital/analog converter 307 is required.

Another advantage of the preferred embodiment of the invention shown in FIG. It is. With screw stems, the noise reduction circuit is built into the receiver and connected to the carrier. Detects amplitude changes in one cycle of a sine wave that exceed a specified limit.

Noise generation tends to occur within one carrier cycle. Amplitude variation of previous technology In the tonal signal, this additional noise power is added to the spectrum, resulting in A noisy demodulated signal is obtained. However, in a preferred embodiment of the invention , the slew rate of the digitally modulated signal can be set within determined limits. if, The added power is set to the slew rate in the digitally modulated signal 312. If the amplitude of a continuous sine wave in the carrier signal is outside the specified limits specified by Any change in the value indicates the addition of noise. False shifts in such modulated signals are ignored by the receiver, which can reduce noise. method like this In this case, information transmitted digitally by amplitude modulation is immune to noise. and the demodulated signal will be pure digital data input to the demodulator . As a result, in the above example, demodulation can be performed using only amplitude modulation and without noise. Very narrow bandwidth system allows transmission of compact disc quality information. Wear.

In a preferred embodiment of the invention, the quality of the elements and the 256 bits in ROM 304 are Due to address limitations of the client, a 10 MHz output signal may have a center frequency of Varies below hertz. The exact drift with respect to the carrier center frequency is and the bit resolution of the digital registers.

The present invention provides an amplitude modulated signal that can be demodulated in existing AM receivers without modification. do. This amplitude modulation receiver has an overall power error about the carrier center frequency. envelope, so the full power of the carrier frequency is received by the receiver. , and is properly demodulated. However, some tuners of existing AM receivers , the AM broadcast band in North America typically has a carrier frequency of 20 kilohertz. and receives an extremely wide spectrum. This allows existing AM receivers to receiving and demodulating a sideband-less amplitude modulated signal produced by a preferred embodiment of the invention; The carrier signals generated are separated by at least 20 kHz. If so, make this possible. If the receiver only receives the carrier frequency A narrowband design allows full allocation to the AM broadcast band. present invention Bench tests have shown that the drift from the carrier center frequency is only 200 Hertz and 100 quality broadcast carrier frequencies in just one AM broadcast band becomes possible. This allows amplitude modulation by using high quality elements for medium waves. Within the available spectrum for broadcast waves, it is possible to increase the number of Become. If the usage band increases by 100, it will be used for a wide variety of purposes including commercial, personal, and military use. Available for

Figure 6 shows how high-quality, noise-free information is transmitted over a frequency range only every 200 Hertz. shows a number of carrier frequencies to be transmitted. The information on these carriers is added to the signal. Digitally encrypted to ensure that the information contained is not obfuscated.

For example, having multiple signals in close proximity, as is currently done, hides true information. and present false information. This causes some carrier frequencies to be It becomes an interfering frequency that nords information. Similarly, when frequencies are transmitted simultaneously, Digitally encrypted information can be transferred between different carriers at different times. distributed over a wide spectrum, which allows the true location to be determined based on the cryptographic key. Hide data or distribute data location.

Figure 7 shows the modulation prepared for modulating sideband-less AM, normal AM or FM. System ROM 601 includes multiple pages of digital representations of sine waves. if, One page is selected and the time axis of the sine wave in digital notation is If the signal is modulated in degrees, denotal frequency modulation (FM) is obtained. If the frequency is and the address to the digital notation is incremented by that frequency, Moreover, if only the page address is modulated, amplitude modulation can be obtained on the same carrier. R The speed at which the page address and A address in OM601 are incremented Modulating both provides simultaneous amplitude and frequency modulation. amplitude or frequency Digital modulation of numbers can be the result of one modulating signal or two separate modulating signals. This allows FM and AM to be transmitted simultaneously on the same RF carrier.

A sine wave in digital representation is a single-sided signal or a double-sided signal for regular AM transmission. Stored as a waveband signal. Also, CW can be sent by always selecting the same page. It is trustworthy.

The operation of the sideband-less modulation system of FIG. 7 is similar to the description in FIG. frequency Register 602 fixes the base carrier as described above. This base frequency However, for FM synchronization by latch 608, the digital modulation It can be modulated by signal 603. Synchronized digital modulation on line 615 The signal has the output of the frequency register 602 and the value described by the modulation signal 603. (positive or negative) added or subtracted. The output of modulation adder 604 is It is used as an increment value to drive the calculator 605. Phase adder 6 05, the increment value for the modulation adder 604 is sent to the address register 606. and the result of . The master clock 607 controls address movement to the ROM 601. Clock address register 606 at a fixed frequency to synchronize operations. Ru. FIG. 8 shows a block diagram of a sideband modulation system 800, which is another embodiment of the present invention. This is a diagram. Block 801 is, for example, n bits representing digitized audio. is a digital source with an output.

The output of digital modulation source 801 is provided to latch 802 and to ROM 809. Used to provide digitally modulated data synchronously. For latch 802 The zero-cross synchronization signal is received from the ROM, which can be generated in a number of ways. for example, The zero cross signal can be a sine wave in ROM data or a digital table in external logic. It can be encoded as a signature and used to detect sign changes in the data. Rat The synchronized digital modulation data from the switch 802 is supplied to the modulation selector 803. be done. This modulation selector 803 allows the modulator 800 to perform sideband amplitude modulation. power and sidebands (AM with sidebands.

FM, CW, SSB, etc.) Select whether or not to perform normal modulation. “C” of ROM809 ”The input section is a control used to select between ZSB (electronic sideband) and normal modulation. This is the input section.

The "N-manual power section to the ROM 809 is an n-bit length modulation signal, and this signal is Specific amplitude of a sine wave in digital representation corresponding to an n-bit digital modulation signal is used to switch pages with , where n is the required amplitude resolution and and the number of pages to be fixed in memory.

Frequency register 804 contains the digital information necessary to generate the carrier frequency. It is a digital register that stores . This frequency register is The knee can be selected depending on the heart frequency.

The output of frequency register 804 is a variable used only to generate the normal modulation signal. The modulation adder 805 is driven. If modulation selector 803 selects normal modulation, If the modulation selector 803 is The modulation adder 805 is driven by the digital modulation signal of the first modulation signal. if modulation selector If normal modulation is not selected at 803, driving modulation adder 805; The n-bit length signal from the modulation selector 803 is set to O corresponding to ZSH. It will be done.

When the output of the modulation adder 805 increases, some peaks are skipped on the time axis. The modulation adder 805 increases the phase angle when the carrier signal is generated. It has the function of increasing or decreasing. The modulation adder 805 receives the input from the modulation setter 803. The f focus value from frequency register 804 is added to the n-bit value. One aspect of the present invention One preferred embodiment provides digital audio from a compact disc system. In this case, n may be 16 hits. Also, for example, f is 30 bits long. You can.

The result of the addition of the n-bit value and the f-bit value in the modulation adder 805 is the normal modulation When is selected, n is added or subtracted from the f value. if, If sideband-free modulation is selected, the f bit value of modulation adder 80,1 is equal to the frequency This is the same as the f focus value output from the number register 804.

The combination of phase adder 806 and addition register 807 drives ROM 809. A feedback loop is formed to increment address "M". "M" is (Fig. 4 and the page selected by “N” in the ROM 809 (as shown in FIG. 5) corresponds to the time (horizontal) axis of the sine wave in digital representation in the memory of . phase addition The output of the adder 806 is the f bit value, which is equal to the f bit value from the adder register 807. This is a combination of the bit value and the f bit value from modulation adder 805.

Addition register 807 is incremented by master clock 808.

Each time the master tarlock increments addition register 807, a new f bit is added. value is loaded. The new value loaded into addition register 807 is added to the previous value. The f bits from the modulation adder 805 are added. Addition register 805 The f bits are typically 30 bit values in the preferred embodiment, including , the most important 8 bits used as an address to the ROM address input section "M'" Including. The m-bit "M" address is the frequency register 804, modulation adder 8 059 phase adder 806 and master clock 808. The page selected at the speed selected by the combination of addition registers 807 Increments through a sine wave in digital representation. in this way, Modulation with no sideband or AM with sidebands or FM with sidebands In order to generate an RF carrier as a normal modulation, we pass a sine wave in dental notation. A wide range of variable increment speeds is available.

The data bit width of the output section “Q” is determined depending on the amplitude resolution of the carrier signal. It will be done. In the preferred embodiment, 10 bits are selected as the q-bit signal "Q". . The data output section “Q” is set to 0 by the master clock 808, and the address circuit Synchronize. The latch 810 is used to organize the output signals from the ROM 809. synchronize the input data.

Dental/analog converter 811 is synchronized by master clock 808. is driven by q bit j= from latch 810.

The analog output from the digital/analog converter 811 is passed through the filter 811. from the dental/analog converter 811. Makes the stepped output into a smooth sine wave. The output from filter 812 is RF Amplifier 813 is driven and the signal is then transmitted via the antenna.

FIG. 9 shows a communication system for transmitting and receiving information using the technology of the present invention. A simplified block diagram is shown. Digital modulation data 914 or digitized Analog output 913 (digitized audio, digitized music, dental very basic sideband-less The amplitude modulation system is shown on the left side of FIG. Analog information is an analog/digital controller. It must be digitized using converter 908. Digital modulation data is In order to select a sine wave of a specific amplitude corresponding to the value of digital information, the ROM 904 Used to select pages within. The selector 909 shown in FIG. Select a digital or digitized analog source. The output of selector 909 is This launch is input to the synchronization latch 902 and is detected by the zero cross detector 903. When detecting the zero cross of the carrier sine wave, the dental modulation data 914 or applies the digitized analog information 913 to the vane input section of the ROM 904. Ru. In this method, the magnitude of the sine wave for the selected vane is It is changed only by the zero crossing detected in the output data of No. 4.

The carrier frequency is switched by a clock 915. Clock signal in Figure 9 is selected by the user depending on the medium and the requirements for sending and receiving. is a fixed RF frequency. Clock frequency is the desired RF carrier frequency m times, where m is the digitized size stored in ROM 904. This is the number of bits on the time axis for one cycle of a signal wave. Counter 901 is free It is a ring counter that functions as a clock 915 until it reaches its maximum value. Continue counting up the lock and start again from O. ring counter 90 The output of 1 drives the address input section of ROM 904. In this method, the selected The magnitude of the sine wave for the printed page is continuously addressed in the ROM 904. , a digital sine wave is output as the output data of the ROM 904.

The output data of ROM 904 is output to digital/analog converter/unit 905 and It is applied to the Rocross detector 903. Digitized sine waves are digital/analog It is converted into a stepwise sine wave by the log converter 905, and then filtered. Step 906 smoothes the step shape. The sine wave carrier is connected to the RF amplifier 90. 7 and transmitted from antenna 920.

The receiving antenna 921 receives an electromagnetic signal of an amplitude modulated carrier with no sideband. and is applied to a conventional radio detector 910.

Detector 910 converts the modulated signal into a digital or analog signal depending on the applied wireless receiver. Restore to log format. The signal from the detector 910 is applied to an amplifier 911, Output digital or analog here. Digitized audio human power 91 3 is restored as analog output 912. applied to the transmitter of system 990. The digital source 914 outputs an analog signal to restore the digital data at output 917. Requires log/digital converter 916.

In the communication system of Fig. 10, the communication medium is a satellite-based antenna link and a downlink. The communication system 990 of FIG. 9 is similar to the communication system 990 of FIG. Normal wireless transmission Alternatively, for example, a satellite uplink 930 can be used. Satellite Anoblin One channel per channel (SCPC), sideband-less amplitude modulation data or digitized analog signal to be transmitted from satellite 932. believe A preferred embodiment of the invention provides a very narrow frequency, sideband-free amplitude modulation key. This makes the 5CPC transmission system using satellite 932 the Since it does not occupy a small band, the communication capacity of the satellite transmission system can be greatly increased.

Satellite downlink 931 is one channel for each channel relayed by satellite 932. receive the rear information and demodulate the signal in the conventional manner as described above.

Communication system 922 of FIG. 11 is similar to the system of FIG. 9 except that the transmission medium is changed. Same as 990. In this example, for relaying an amplitude modulated carrier with no sidebands, A fiber optic transmission and reception system is used. fiber optic transmitter 940 receives the modulated carrier from amplifier 907 and lays it on the ground. via fiber optic link 942(a) of the path. Combined with 942(a) The other end of optical fiber link 942(b) receives the modulated carrier signal. and convert the optical signal into an electrical signal for detection by a detector 910. . Demodulation is done as previously described.

FIG. 12 illustrates the communication system of FIG. 9 except that a ground-based wire communication medium 950 is used. Same as stem. Sideband-less carrier modulation and demodulation are the same as described above.

Those skilled in the art will appreciate that a wide variety of terrestrial and spatial communication systems are suitable for the present invention. Application to other embodiments may easily be considered.

FIG. 13 shows the memory available for ROM in the preferred embodiment of the present invention. Fig. 3 illustrates mapping. Many digital representations of sine waves are Pager or It is indicated by page n. Each page of memory is configured by a digital modulation signal applied to the ROM. selected based on the number.

For example, 256 pages can be stored in ROM and support for 256 individual digital representations. Provides the amplitude level of the in-wave. Depending on the variable vR value, a sine wave with a specific amplitude is selected. selected. The sine waves in all pages in memory have the same period and size. have the same point along the wave. Points along each sine wave on each page Only the amplitude at is different. For example, in the sine wave of vane 1 in digital representation, The maximum amplitude in the first half period is a small digital value. In contrast, the page The maximum amplitude in the first half cycle of the digitally represented sine wave at It is a digital value. In a preferred embodiment of the invention, the number of pages is selected to be 256. . As a result, the digital modulation signal is selected to have a length of 8 bits. Inside each vane , there are 256 digital points along the time axis of the digitally represented sine wave.

This requires 8 bits to ROM to select a time point along the curve. An address is required. The amplitude or magnitude of each sine wave is 8 bits indicating the magnitude. selected as the default value. As a result, the output of the ROM becomes 8 bits long. This is it 256 vanes with 8-pin words accommodates 64 ROMs (65,536 bytes) ) is required.

In a preferred embodiment of the invention, the higher RF carrier frequency is used to implement the circuit. Limited only by the speed of the digital logic.

General purpose TTL logic easily achieves 5MHz RF carriers.

General-purpose ECL logic generates RF carriers in excess of 50 MHz, while GaAs (Gallium Arsenide) produces RF carriers in excess of 500MHz . Those skilled in the art will appreciate that newer high speed digital logic It will be appreciated that the carrier frequency is easily achieved.

Circuit means for carrier modulation that does not produce sidebands Figures 14 to 18 show circuits that do not produce sidebands. 1 is a detailed electrical schematic diagram illustrating the circuit means for carrier modulation; FIG. Connect via signal name The description will be given with reference to the following drawings.

Circuit U1 is a processor element that generates digitally modulated data between other circuits. . In this circuit means, in the processor, digitally modulated data is carrier modulated. stored in processor memory used for Is the modulation data from an external source? It is also possible to receive the modulated data from the is taking.

In a preferred circuit means, the processor element Ul is a processor made by NEC Corporation and other 70 320 processors are available.

Elements U2 and U3 shown in FIG. 14 are ROM and RAM storage elements, respectively. . In the preferred circuit implementation, U2 is part number 27C512 or 64K. A brom is used for the UV erasable 512, which has an arrangement of 8 bits. This U2 Elements made by Intel and all other semiconductor companies can be used. . The preferred circuit means for the RAM element U3 is an 8-bit structure of 37.768. A 43256 CMOS static RAM device is used. RAM element U3 and Those manufactured by NEC and other semiconductor companies can be used. ROM and and RAM elements U2 and B3 are the processor-based modulators of FIGS. 14-18. used as a processor holding chip for

The base frequency is generated by counter element U4 shown in FIG. Illustrated selection A crystal oscillator with a frequency of , in the preferred embodiment, counter element U4 is a texas part number 74F163. Instruments and others are available. clocking frequency F1 to B5 can be used for circuit control. Therefore, U4 is the main carrier frequency A counter used to generate numbers.

Registers U8, U9 and UIO are connected to the phase registers supplied by processor element T:1. It's jista. These three phase register circuits each have three additional holding chips. The configuration is the same as shown in FIGS. 17 and 18. all Each chip is illustrated with a part number and is sold by Texas Instruments. and others are available.

With respect to FIG. 18, the phase register element UIO is connected to the 4-bit binary full adder U16 and and U15, and the adders U16 and U15 add four bits A1 or A4 and B1 or B4 are added, and the addition result E1 or B4 is generated. be done. The sum from chips U16 and U15 is part number 74LS374. Lunch processing is performed by the register chip U19. These lunched values are The feed signal is passed through the calculator elements U16 and U15 for addition processing. . The configuration of phase registers U9 and U8 shown in FIG. 17 is the same as the above configuration.

The carrier bits from full adders U11, U12, U13, U16 and U17 are ADD by transferring the value of the low-order bit of the adder to the high-order bit of the full adder. connected to form a ladder chain.

U5 was attached to processor U1 and phase registers U8, U9 and Ulo A decoder element used to select and control these registers. rank Phase registers U8, U9 and UIO are used to determine or select the carrier frequency. used for The most effective 8 bits of the adder element are ROM element elements 0 and U. 21 address lines, and in preferred circuit means the ROM element also has RO It is the same UV erasable brome as M element U2.

ROM element element 0 and U21 are sine wave digital signals included in each page of memory. The sine waves have the upper 12 bits of launch elements U25 and U26, respectively. The data is continuously read out from the digital/analog (D/A) converter U23 via and U23 are continuously written. In a preferred embodiment, these lugs The same 74F374 as the launch element described above is used as the launch element. D/A converter U23 is a 12-bit analysis D/A converter that can be used by multiple companies. is used. In another circuit means, a launch element U is used as the D/A converter 23. Used to average the dental data with steps from 25 and U26. It is also possible to use a step smoothing filter. The latch element is made of crystal It is synchronized with the clock frequency F1 from the vibrator X1.

The most important bit from ROM element element 1 (DIG15) is the zero cross signal It is used as a latch element U24 to drive an address bar from processor element U1 Supplying digital data P2-0 to B2-7 to the line AOO", : and AO7 is input to the vane input AC or A7 of ROM element 0 and U21 in FIG. Synchronize when . In this configuration, signal DIG15 is used as a zero-crossing signal. is used to input digital data to the sine contained in ROM element element 0 and U21. Synchronize with the page address selection of the wave digital display.

The output of the D/A converter U23 is processed by a simple smoothing filter consisting of suitable elements shown in FIG. It is driven through the filter and is pressed against the coaxial connector J2. RF amplifier and and an antenna can be connected to coaxial connector J2 (not shown).

Additional holding chips may include, for example, buffers U60 or Buffer U60, as shown in FIG. U62 and U3O through 072 are used for each n1 bar.

3 and microprocessor to microprocessor sensor to this preferred implementation. Used in the example n7': simple control signal to external communication bus, control information to zero sidewave applied to the band carrier circuit.

Analog modulation of the dentally generated carrier Figure 19 shows the analog modulation of the digitally generated carrier. A communication system that achieves analog modulation of the carrier and generates carrier modulation without sidebands. FIG. Generation of carrier frequency via ROSi element 410 is , since a single page of memory is used for the digital display of the blood-amplitude of the sine wave. The rest is the same as the description regarding FIGS. 3 to 13. Mask clock 403 is a circuit used to synchronize operations. The frequency register 401 includes an addition register. The desired value is continuously counted up by the phase adder 405 and the phase adder 402. A new RF carrier is preloaded. The count frequency is the above sine wave digital Address individual data points in ROM 410 via address lines 404. used to configure the settings. Multi-pit digital data from ROM410 The output is synchronized with master clock 403 via latch 411. dental de The output of the data is input to a D/A converter 413 via line 412.

Analog modulation signal sources 406 include audiovisual, audio, image, and other signal sources. It can be constructed from a wide variety of signal sources. The above signal source is the sample/hold circuit 40 9, the circuit 409 samples the analog value at a particular point in time. used for processing and capturing. Sample/hold circuit 409 is a zero detection circuit The circuit 408 is controlled by the stepped analog output of the D/A converter 413. A detection operation is performed when the force crosses the zero cross point. Next, the zero cross detection circuit 4 08 controls the sampling of the analog signal source and is the reference input line of the D/A converter 413. 417. As known to those skilled in the art, the reference voltage to the D/A converter By changing , the pressure of the D/A converter changes slightly. Usually the data The reference input of the D/A converter is held at a predetermined level while the value of the data signal changes. .

In this embodiment, by changing the value of the reference human power line 417, the output The value changes at the cello cross, thus emitting a modulated carrier with zero sidebands. live. The output of the D/A converter 413 is input to a smoothing filter 414, and further The signal is then input to an RF amplifier 415 and broadcast via an antenna 416. Another fruit In the exemplary embodiment, the output of sample/hold circuit 409 is connected to amplifier 415 (see FIG. 20). (described later), the value of the radio frequency carrier is input to the gain stage at the zero crossing point. Change only the

Dental modulation of analog carriers Figure 20 shows how digital modulation of an analog RF carrier changes the carrier without sidebands. 1 is a block diagram of a method and apparatus for generating tone. FIG. Digital modulation signal source 5 As 01, one digital definition, digital audio data, digital image data and other transmitted digital information, etc. - focus or multiple bits digitally modulated signals are available. Digital data enters the latch circuit 502. The circuit 502 is synchronized with the zero detect circuit 504. analog modulation signal Source 505 can be constructed from a known signal source such as a crystal oscillator. career center In order to detect Rocross, a predetermined RF multiplied signal is input to the zero detection circuit 504. . By detecting the zero cross of the carrier, the launch circuit 502 becomes digital. Capture the dental value of the modulated signal. The output of the latch circuit 502 is sent to the D/A converter 50. 3, the converter 503 changes the amplification factor of the RF amplifier 506 to the zero crossing point. It is used only to change. The amplification factor of an amplifier can be changed in various ways. It is possible to For example, when using a feedback loop, the amplification factor can be changed by changing the value of the feedbank between the output and input. . Additionally, some types of amplifiers employ voltage reference inputs, and as a result of changes in the input, The configuration is such that the value of the output signal changes accordingly. In addition, the amplification factor of the RF amplifier Methods of making changes are known to those skilled in the art.

An analog carrier of a predetermined size is input to an RF amplifier, where the input signal is Changing the amplification factor of the RF amplifier 506 only by the zero crossing of the carrier Digitally modulated by In this way, the output of RF amplifier 306 is When input through antenna 507, it generates carrier modulation without sidebands.

FIG. 22 shows an analog for generating carrier modulation without sidebands in yet another embodiment. 1 is a block diagram of a method and apparatus for digital modulation of an RF carrier. Digital As the modulation signal source 511, digital audio, digital audio data, digital single focus or multiple Heavy bit digital modulation signals can be used. Digital data is latch circuit 5 12 and the circuit 512 is synchronized with the zero detection circuit 514. analog R As the F signal source 515, a known signal source such as a crystal oscillator can be used. career An RF flaw signal of a predetermined frequency is input to the zero detection circuit 514 to detect zero crossing. be done. By detecting the carrier zero cross, the latch circuit 512 performs digital modulation. Capture the digital value of a signal. The output of the launch circuit 512 is the analog RF signal source 5 15, and the signal source 515 receives the value of the oscillator output only at the zero crossing point. change. The output value of the oscillator can be varied in various ways. for example, Some types of transmitters use a reference voltage, and by varying the reference voltage, It is designed to change the value of the output signal. That which changes the output value of the oscillator Other methods are known to those skilled in the art.

Analog modulation of analog carrier Figure 21 shows that by analog modulation of an analog RF signal source only by zero crossings. 1 is a block diagram illustrating circuit means for carrier modulation without sidebands; FIG. analog weird The modulation signal source 701 is a variety of analog signal sources and sources of information such as audio, voice, and images. and other signal sources. The analog modulated signal source is sampled/saved. The analog value at an arbitrary point in time is input to the holding circuit 702. Samples are processed and captured by 02. The analog value is then sampled/retained is sent on the output line of circuit 702. The analog modulation signal source 705 is a crystal oscillator or and other RF energy sources can be used. RF signal source 705 is a predetermined It is an energy generation source with a frequency and a predetermined amplitude. The output of the RF signal source 705 is RF It is monitored by a zero detection circuit 703 for flaw signal zero crossing. RF scratch signal zero Each time a point is crossed, the zero detection circuit 703 causes the sample/hold circuit 702 to An analog value of an analog modulated signal source 701 is captured.

The output of sample/hold circuit 702 is input to RF amplifier 706 and amplified by the amplifier. Vary the rate. As mentioned above, RF amplifiers have a method of varying their amplification factor. Therefore, many people can change the feed/cut value in the amplifier, change the reference value, etc. There is a law. The output of amplifier 706 is input to antenna 707, from which it is RF modulated. The signal is transmitted without sidebands.

FIG. 23 shows an analysis of an analog RF signal source only at the zero crossing of yet another embodiment. In a block diagram illustrating the circuit means for performing carrier modulation without sidebands by log modulation. be. The analog modulation signal source 711 provides various types of information such as audio, voice, and images. It can be configured with analog signal sources and other signal sources. analog signal source is input to a sample/hold circuit 712 where the analog value at any point in time is is sampled and captured by the circuit 712. Then the analog value is Output from pull/hold circuit 712. Crystal as analog RF signal source 715 Oscillators and other sources of RF energy can be used. Analog RF signal The signal source 715 is an energy generation source of a predetermined frequency. The output of the RF signal source 715 is The RF flaw signal is monitored by a zero detection circuit 713 for zero crossings.

Every time the RF flaw signal crosses the zero cross point, the zero detection circuit 713 samples it. /Holding circuit 712 captures the analog value of analog modulation signal source 711. sump The output of the signal/hold circuit 712 is input to an analog RF signal source 715. 15 changes the output value of the oscillator only at the zero crossing point. Transmitter pressure value can be varied in various ways. For example, using a voltage reference value In a transmitter configured in this way, the value of the output signal changes as the reference voltage value changes. It is designed to Those skilled in the art will be able to tell you how to change the output value of other oscillators. It is well known. The output of amplifier 716 is input to antenna 717, from which The RF modulated signal is emitted without sidebands.

Career information Referring again to Figure 2, analog multiplication of analog carriers is no longer necessary. Therefore, it is possible to change the value of the RF carrier by zero crossing. It will be readily understood by those skilled in the art that producing sidebands that are more zero cormorant. The amount of information that such carriers can hold is enormous. In the conventional technology, Nyquist Criteria (Nyquist Cr1teria) is modulated Only modulated signals with a large number of carriers (one-half the carrier frequency) can be accurately transported. It described a possible method. According to the invention, the carrier frequency is Modulating signals of less than, equal to, or higher frequency than the carrier signal may also cause It is possible to adjust Referring again to Figure 2, level represents a dental value of zero. However, level B can represent a digital value of 1. In this configuration, the RF The digital carrier rate of the digital carrier is equal to one-half the frequency of the RF carrier.

If different amplitude levels are encoded in the signal with respect to three components, catenary or n ( encoding), the carrier frequency is actually multiple times within each period of the carrier. It is possible to carry values of several bits. Furthermore, the i-line frequency detector of the receiver If it is possible to accurately predict the zero reference line, then the sine wave traveling in the positive direction is Encoding processing is possible by the first modulation signal, and the period of progression in the negative direction is positive. The string wave can be encoded by the second signal. In such a configuration, the key Multiple signals at frequencies higher than the carrier frequency can be combined into a single carrier frequency without sidebands. Encoding processing becomes possible at the wave number.

A modulated carrier with completely zero sidebands due to inaccuracies in the components used It is acknowledged that this is not always possible. However, for those skilled in the art produces particularly limited sidebands due to imperfections in the components used. It will be understood that it is also possible to complete the preferred embodiment of the invention. Dew.

For those skilled in the art, to achieve carrier modulation without sidebands, the digital carrier rear dental modulation, digital carrier analog modulation, and analog carrier digital modulation. Other than the above to perform digital carrier analog modulation and digital carrier analog modulation. It will be readily understood that it is also possible to use circuit arrangements.

Additionally, for those skilled in the art, ROM with RAM, installed in a microprocessor, etc. Renostar, PLA or PAL data, hardware data, specific usage collection Memory provided in product circuits (, ASJC) and other storage memory substitutes. It will be immediately understood that it is possible to replace the memory with various types of memory. Dew. Additionally, although the invention has been described with respect to a preferred embodiment, many variations are possible. Those skilled in the art will readily understand that It is intended to include any adaptations or variations thereof. Therefore, the book The invention is expressly intended to be limited by the claims and the equivalent scope thereof. ing.

FIG.1 7c hitting technique FIG, 13 He has the first signature in digital clothing. International search report. rT/IIe, On/nENQ1+++ -I 17m &I -ρCT/US 90105115 International Search Report

Claims (84)

[Claims] 1. (a) Select the first amplitude of the carrier frequency and use this first amplitude to (b) transmitting the carrier frequency at a zero crossing of the carrier frequency; Switch the carrier frequency to the next amplitude and transmit the carrier frequency at the second amplitude. An amplitude modulation method comprising the steps of: 2. (a) means for generating a carrier frequency having a first amplitude; and (b) a second amplitude. (c) means for generating a carrier frequency in response to the digitally modulated signal; Switch the carrier frequency from the first amplitude to the second amplitude at the zero cross of the carrier frequency. A communication system consisting of a means of communication. 3. a first amplitude with a second carrier sine wave having a second amplitude at the zero crossing; an amplitude modulated signal consisting of a first carrier sine wave; 4. 1. A method of modulating a radio frequency carrier with a modulating signal, the method comprising: (a) radio frequency carrier; Generate a gate signal corresponding to the zero-crossing point of the number carrier, (b) Gating the modulation signal with the gate signal to generate a gated modulation signal death, (c) modulating a radio frequency carrier with said gated modulation signal to obtain a modulated signal; a method comprising the steps of: generating a radio frequency carrier therefrom; 5. 5. The method of claim 4, wherein the step of modulating Now changes the amplitude of the modulated radio frequency carrier only in the cross. The way it works. 6. 5. The method of claim 4, comprising transmitting a modulated radio frequency carrier through a medium. How to do it and send further steps. 7. 7. The method according to claim 6, wherein the step of transmitting is performed by broadcasting. , and a method in which the medium comprises air waves. 8. 7. The method of claim 6, wherein the step of transmitting is done by light; Also, a method in which the medium comprises an optical fiber transmission line. 9. 7. The method of claim 6, wherein the step of transmitting is done by telecommunications. and the medium comprises an electric wire. 10. 7. The method of claim 6, wherein the medium includes a communications satellite. 11. 5. The method according to claim 4, wherein the modulation signal is a digital signal. Law. 12. 5. The method of claim 4, wherein generating the radio frequency carrier comprises: Furthermore, it includes (a) address the storage devices sequentially at a predetermined rate; (b) address the storage devices sequentially at the clock rate; The digital data corresponding to the predetermined amplitude level of the time-varying signal is retrieved from the storage device. (c) converting the digital data into a time-varying analog signal; d) smoothing the time-varying analog signal to generate a radio frequency carrier; A method of adding more steps. 13. 13. The method of claim 12, wherein the time-varying signal is a sine wave. Method. 14. 13. The method of claim 12, wherein the predetermined rate is based on a radio frequency carrier. method chosen to be a multiple of the frequency of . 15. A method for generating an amplitude modulated radio frequency carrier without sidebands, the method comprising: (a) sequentially addressing the address ports of the storage device at a predetermined speed; and (b) addressing the address ports at the speed. from the storage device at a predetermined amplitude point of a first time-varying sine wave having a first amplitude. selectively reading out the corresponding first group of digital data; (c) from the storage device at the speed the first time-varying positive signal having a second amplitude; at a predetermined amplitude point of the second time-varying sine wave with a period equal to and coinciding with the period of the sinusoidal wave. selectively reading out the corresponding second group of digital data; (d) generating a synchronization signal corresponding to a zero-crossing point of the time-varying sine wave; (e) receiving a modulation signal; (f) synchronizing the modulation signal with the synchronization signal to generate a synchronous modulation signal; (g) the first group of digital data and the second group of digital data in response to the synchronous modulation signal; (h) Select between the first group of digital data and the first group of digital data. Convert the selected one of the digital data to a time-varying analog signal, (i ) smoothing the time-varying analog signal to generate an amplitude modulated radio frequency carrier A method consisting of steps. 16. 16. The method of claim 15, wherein the method comprises transmitting an amplitude modulated radio frequency carrier through the medium. A method that further includes a step of transmitting the real image. 17. 17. The method of claim 16, wherein the step of transmitting is performed by broadcasting. and the medium comprises air waves. 18. 17. The method of claim 16, wherein the step of transmitting is performed by light. and a method in which said medium comprises an optical fiber transmission line. 19. 17. The method of claim 16, wherein the step of transmitting is by telecommunication. and wherein the medium is an electric wire. 20. 17. The method of claim 16, wherein the medium includes a communications satellite. . 21. 16. The method of claim 15, wherein the predetermined rate is an amplitude modulated radio frequency A method chosen to be a multiple of the carrier frequency. 22. 16. The method according to claim 15, wherein the modulating signal is not a digital signal. How to do it. 23. A method of modulating a radio frequency signal with a modulating signal, the modulating signal having a first amplitude. generating a first time-varying radio frequency signal and having a second amplitude; a second time-varying radio frequency that is in phase with the frequency signal and also has the same duration; generate a signal, Said first or second time variable is applied only at zero crossing points in response to a modulating signal. 1. A method comprising the steps of selecting any of the following radio frequency signals. 24. A device for modulating a radio frequency carrier with a modulation signal, the radio frequency carrier being means for generating a gate signal corresponding to a zero crossing point of the carrier; Gate the modulation signal with the gate signal, and then generate the gated modulation signal. a means of generating; modulating a radio frequency carrier with said gated modulation signal and changing therefrom; and means for generating a tuned radio frequency carrier. 25. 25. The apparatus of claim 24, wherein the apparatus includes a radio frequency key modulated over a medium. The apparatus further comprises means for transmitting a carrier. 26. 26. The apparatus of claim 25, wherein the medium comprises air waves. 27. 26. The apparatus of claim 25, wherein the medium comprises a fiber optic transmission line. equipment. 28. 26. The apparatus of claim 25, wherein the medium comprises an electrical wire. 29. 26. The apparatus of claim 25, wherein the medium comprises a communications satellite. Device. 30. 26. The apparatus of claim 25, wherein the modulating signal is a digital data signal. A device that is 31. 25. The apparatus of claim 24, wherein the means for generating the radio frequency carrier further comprising a stage, wherein the generating means sequentially addresses the storage device at a predetermined speed. a predetermined amplitude in a time-varying signal from said storage device at said speed; means for reading out digital data corresponding to the level; and means for changing the digital data over time. means to convert the analog signal into means for smoothing the time-varying analog signal to generate a radio frequency carrier; A device consisting of. 32. 32. The apparatus of claim 31, wherein the time-varying signal is a sine wave. Device. 33. 32. The apparatus of claim 31, wherein the predetermined rate is a radio frequency carrier. device chosen to have a frequency that is a multiple of the frequency of 34. frequency source means for generating address signals and frequency source means for receiving digitally modulated signals; modulation input means, connected to the modulation input means and responsive to the zero cross detection signal; synchronization means for synchronizing the digital modulation signal to generate a synchronous digital modulation signal; , a first address port connected to said frequency means; and a first address port connected to said synchronization means. a second address port and a data output, each having a different while storing a plurality of digitally represented sine waves having different amplitudes; the address signal and the synchronous digital modulation to the port and the second address port. When each signal is input, one of the digitally expressed sine waves is inputted to the storage means for selectively generating data output; and a storage means connected to the data output of the storage means. is connected, detects the zero crossing of the sine wave of the selected digital representation, and a detector means for generating the zero-crossing detection signal from this; and a detector means for generating the zero-crossing detection signal from the connected to the data output to time-varying the selected digital representation sine wave. a conversion means for converting into an analog signal; is connected to said converting means to smooth the time-varying analog signal to a substantially zero level. A fiber that generates an amplitude modulated radio frequency carrier therefrom with sideband energy. A device consisting of router means. 35. A sideband-free modulation device, first sine wave means for generating a first sine wave in digital representation having a first amplitude; second sine wave means for generating a second sine wave in digital representation having a second amplitude; connected to the first sine wave means and the second sine wave means to generate the digital representation; A selection is made between the first sine wave and the second sine wave in digital representation in response to a synchronous modulation signal. a selection means for selecting, connected to the first sine wave means and the second sine wave means; The zero cross of the first sine wave in digital representation and the second sine wave in digital representation zero detection means for detecting; modulation input means for receiving a modulation signal; connected to the modulation input means and the zero detection means for synchronizing the modulation signal; and a synchronizing means for generating the synchronized modulation signal. 36. 36. Apparatus according to claim 35, connected to the selection means and configured to The selected one of the first and second sine waves in the notation is converted into a time-varying analog signal. converter means for converting; The converter is connected to the converter to smooth the time-varying analog signal, resulting in almost no sidebands. a filter that produces therefrom an amplitude modulated radio frequency carrier having an energy of - means. 37. incrementing digital signals corresponding to the desired carrier frequency. first register means for generating a total value; connected to the carrier frequency register and inputting the incremental digital value; Both are connected to the second register to provide an incremented sequential address value (in cremented sequential addressing value e) is configured to be input and the incremental digital value is incremented by the increment. phase adder means for adding to the sequential address values to generate a rate of change value therefrom; and, clock means for generating a main clock signal; said main clock signal and said rate of change value; is connected to input the incremented sequential address signal. said second register means for generating therefrom; said incremented sequential address signal connected to said second register means; The first address input is connected to the synchronous latch to receive the synchronous digital modulation signal. a storage means having a second input address port into which a signal is input, and a data output; , the storage means stores digitally represented sine waves having different amplitudes. and in response to the rate of change value and the synchronous digital modulation signal. operative to produce a selected version of a sine wave in digital representation at the data output. means for receiving a digitally modulated signal; Connected so that the digital modulation signal and zero-cross detection signal are input. said synchronizing means for generating said synchronized digital modulated signal therefrom; connected to the data output means to generate a sine wave generator of the selected digital representation; detector means for detecting a zero crossing and generating said zero crossing detection signal therefrom; , connected to the data output means to change the digitally represented sine wave over time; converter means for converting into an analog signal; said converter means being connected to said time signal; amplifier means for amplifying the varying analog signal; a transmitter connected to said amplifier means for broadcasting said time-varying analog signal; A radio transmitter consisting of stages. 38. A method of modulating a radio frequency carrier with an analog modulation signal, the method comprising: (a) generating a gate signal corresponding to a zero crossing point of a radio frequency carrier; (b) Gating the analog modulation signal with the gate signal, and gating the gated modulation signal. generate a signal, (c) modulating a radio frequency carrier with said gated modulating signal to substantially zero generating therefrom a modulated wireless carrier having a sideband of How to become. 39. 39. The method of claim 38, wherein the radio frequency carrier is digitally processed. A method that consists of being generated in a physical sense. 40. 40. The method of claim 39, wherein generating the radio frequency carrier comprises: including; (a) sequentially addressing the storage devices at a predetermined speed; and (b) addressing the storage devices at the speed. , read out digital data corresponding to a signal that changes over a predetermined time, (c) converting the digital data into a time-varying analog signal; (d) converting the digital data into a time-varying analog signal; Updated steps for smoothing the analog signal that varies over time to generate the radio frequency carrier. How to set it up. 41. 41. The method of claim 40, wherein the step of modulating or the gate The modulation signal is supplied to the reference input of the digital-to-analog converter to achieve zero clock The method further comprises: changing the amplitude of the radio frequency carrier at the point. 42. 41. The method of claim 40, wherein the step of modulating is gated. The modulation signal is supplied to the gain stage of the amplifier, and the radio frequency carrier is detected at the zero crossing point. This law further includes changing the amplitude of A. 43. 41. The method of claim 40, wherein the time-varying analog signal is a sine wave. How to do it more than anything. 44. 41. The method of claim 40, wherein the predetermined rate is a radio frequency carrier. The method consists of being chosen to be multiple times the frequency. 45. 39. The method of claim 38, wherein the radio frequency carrier is an analog signal. A method consisting of being generated as a number. 46. 46. The method of claim 45, wherein the modulating step is gated. The modulation signal is supplied to the gain stage of the amplifier, and the radio frequency carrier is detected at the zero crossing point. The method further comprises changing the amplitude of the a. 47. 46. The method of claim 45, wherein the modulating step is gated. A modulation signal is supplied to a radio frequency oscillator, and the radio frequency carrier is detected at the zero crossing point. The method further comprises changing the amplitude of the a. 48. This is a method of modulating an analog unrelated frequency carrier with a digital modulation signal. hand, (a) Generate a gate signal corresponding to the zero crossing point of the analog radio frequency carrier death, (b) Latch the digital modulation signal with the gate signal and generate the latched digital signal. (c) generate a latched digital modulation signal; and (c) generate a latched digital modulation signal. Convert to analog modulation signal, (d) modulating a radio frequency carrier with the latched analog modulation signal; From there a modulated analog radio frequency carrier with near zero sidebands A method comprising the steps of generating. 49. 49. The method of claim 48, wherein the step of modulating comprises latching. The analog modulation signal is supplied to the gain stage of the amplifier, and the analog modulation signal is The method further comprising changing the amplitude of the radio frequency carrier. 50. 49. The method of claim 48, wherein the step of modulating comprises latching. The analog modulation signal is supplied to a radio frequency oscillator, and the analog modulation signal is output at the zero crossing point. The method further comprising changing the amplitude of the radio frequency carrier. 51. 39. The method of claim 38, wherein the modulated radio frequency carrier is The method further comprises the step of transmitting via. 52. 52. The method of claim 51, wherein the step of transmitting is performed by broadcasting. and the medium comprises air waves. 53. 52. The method of claim 51, wherein the step of transmitting is performed by light. and wherein said medium comprises an optical fiber transmission line. 54. 52. The method of claim 51, wherein the step of transmitting is by electrical transmission. and wherein the medium is an electric wire. 55. 52. The method of claim 51, wherein the medium includes a communications satellite. . 56. 4G. The method of claim 4G, wherein the predetermined rate is a modulated radio frequency The method consists in that the number is chosen to be multiple times the frequency of the carrier. 57. A device that modulates a radio frequency carrier with an analog modulation signal, means for generating a gate signal corresponding to a zero crossing point of the frequency carrier; Gate the analog modulation signal with the gate signal and generate the gated modulation from there. means for generating a signal for modulating a radio frequency carrier with said gated modulating signal; modulate and from there a modulated radio frequency carrier with near zero sidebands. and a means for generating. 58. 58. The apparatus of claim 57, wherein from a stored digital pattern The apparatus further includes means for generating a radio frequency carrier. 59. 58. The apparatus of claim 57, wherein the means for modulating the radio frequency carrier The steps are means for sequentially addressing the storage device at a predetermined rate; and means for sequentially addressing the storage device at the predetermined rate; The procedure for reading out the stored digital pattern from the It supports signals that change over a fixed period of time. means for converting the stored digital pattern into a time-varying analog signal; , means for smoothing said time-varying analog signal to generate a radio frequency carrier; A device consisting of. 60. 60. The apparatus of claim 59, wherein the means for modulating converting the gated modulation signal to change the amplitude of the radio frequency carrier by a device comprising means for 61. 61. The apparatus of claim 60, wherein the means for converting A device consisting of a digital-to-analog converter with a reference input mounted in stages. 62. 60. The apparatus of claim 59, wherein an amplifier is attached to the smoothing means. further comprising: the modulating means modulating the amplitude of the radio frequency carrier at the zero crossing point. means for supplying a gated modulation signal to a gain stage of said amplifier to modify the gain stage of said amplifier; A device comprising: 63. 60. The apparatus of claim 59, wherein the time-varying analog signal is sinusoidal. A device consisting of being a wave. 64. 60. The apparatus of claim 59, wherein the predetermined speed is a radio frequency carrier. Equipment selected to be multiples of the frequency. 65. 58. The apparatus of claim 57, wherein the radio frequency carrier is an analog signal. device generated as a number. 66. 66. The apparatus of claim 65, wherein the means for modulating comprises an amplifier and a zero Gated modulation signal to change the amplitude of the radio frequency carrier at the cross point and means for providing a gain stage of the amplifier. 67. 66. The apparatus of claim 65, wherein the means for modulating radio frequency oscillations. gated to change the amplitude of the radio frequency carrier at the zero crossing point. Apparatus comprising means for supplying a modulating signal to the radio frequency oscillator. 68. A device that modulates an analog radio frequency carrier with a digital modulation signal. hand, A hand that generates a gate signal corresponding to the zero crossing point of an analog radio frequency carrier step by step, Latch the digital modulation signal with the gate signal and perform the latched digital modulation. means for generating a signal for digital modulation; and means for generating a signal for digital modulation; means for converting into an analog modulation signal; The latched analog modulation signal modulates the radio frequency carrier to almost zero zero. means for generating therefrom a modulated radio frequency carrier having sidebands of equipment. 69. 69. The apparatus of claim 68, wherein the means for modulating comprises an amplifier and a zero The latched analog 2. An apparatus comprising: means for supplying a signal for signal modulation to a gain stage of said amplifier. 70. 69. The apparatus of claim 68, wherein the means for modulating radio frequency oscillations. the latching device to change the amplitude of the radio frequency carrier at the zero crossing point. an apparatus comprising means for supplying an analog modulation signal to the radio frequency oscillator; Place. 71. 58. The apparatus of claim 57, wherein the modulated radio frequency carrier is a medium. The apparatus further comprising means for transmitting via. 72. 72. The method according to claim 71, wherein the means for transmitting is performed by broadcasting. , and an apparatus in which the medium is an air wave. 73. 72. The apparatus of claim 71, wherein the transmitting device is an optical transducer. an optical fiber transmission line. 74. 72. The apparatus of claim 71, wherein the means for transmitting comprises an amplifier; Also, a device in which the medium is an electric wire. 75. 72. The apparatus of claim 71, wherein the means for transmitting 1. An apparatus comprising: a antenna; and wherein said medium includes a communications satellite. 76. A sideband-free modulation device, a modulation input means into which an analog modulation signal is input; and a modulation input means connected to the modulation input means. and samples the analog modulation signal in response to the zero-crossing detection signal. sample means for generating a sampled signal for analog modulation; , a frequency source means for generating an address signal, and an address connected to the frequency source means. It has a response and data output, and is a digital notation sign that can be used to store multiple records. On the other hand, when the address signal is input to the address port, the digital representation is storage means for generating one of the sine waves as the data output; Connected to the data output to detect the zero crossing of the sine wave of the digital representation and detector means for generating said zero crossing detection signal therefrom; connected to the data output of the storage means to time the sine wave of the digital representation; a converting means for converting into an analog signal that changes over time; Smoothing an analog signal that varies between amplitudes with nearly zero sideband energy and filter means for generating a modulated radio frequency carrier therefrom. 77. A sideband-free modulation device, oscillator means for generating an analog radio frequency carrier and connected to said oscillator means; and detect zero crossings of said analog radio frequency carrier to perform zero crossing detection. zero detection means for generating an output signal; A modulation input means into which an analog modulation signal is input, and a modulation input means connected to the modulation input means. sample the analog modulation signal in response to the zero-crossing detection signal; A sample hand that is held together to generate a sampled signal for analog modulation. a stage connected to the oscillator means for amplifying the analog radio frequency carrier; and has a reference input into which the sampled analog modulation signal is input. From there, an amplitude modulated radio frequency carrier with nearly sideband-free energy is and amplifier means for generating. 78. A sideband-free modulation device, oscillator means for generating an analog radio frequency carrier and connected to said oscillator means; and detects the zero cross of the analog unrelated frequency carrier, and performs zero cross detection. zero detection means for generating an output signal; a modulation input means into which a digital modulation signal is input; and a modulation input means connected to the modulation input means. , latching the digital modulation signal in response to the zero crossing detection signal; latching means for holding and generating a latched digital modulation signal; latching means for converting the latched digital modulation signal into a converted modulation signal. converting means connected to said oscillator means for converting said analog radio frequency into a signal; The carrier is amplified and the converted modulated signal is input as a reference input. and an amplitude modulated radio frequency carrier with nearly sideband-free energy. and amplifier means for generating. 79. A sideband-free modulation device, Generates an analog radio frequency carrier with a selected amplitude in response to a reference input oscillator means for connected to said oscillator means to detect zero crossings of said analog radio frequency carrier; zero detection means for detecting and generating a zero crossing detection signal; a modulation input means into which an analog modulation signal is input; and a modulation input means connected to the modulation input means. , latching the analog modulation signal in response to the zero crossing detection signal; a sample means for holding and producing a sampled analog modulated signal; and said sample means is connected to said reference input of said oscillator means to Selecting the amplitude of the analog radio frequency carrier to provide nearly sideband-free energy configured to generate therefrom an amplitude modulated radio frequency carrier having a Device. 80. A sideband-free modulation device, Generates an analog radio frequency carrier with a selected amplitude in response to a reference input oscillator means for connected to said oscillator means to detect zero crossings of said analog radio frequency carrier; zero detection means for detecting and generating a zero crossing detection signal; a modulation input means into which a digital modulation signal is input; and a modulation input means connected to the modulation input means. , latching the digital modulation signal in response to the zero crossing detection signal; latching means for holding and generating a latched digital modulation signal; latching means for converting the latched digital modulation signal into a converted modulation signal. converting means for converting the reference signal of the oscillator means into a reference signal of the oscillator means; is connected to an input to select the amplitude of said analog radio frequency carrier, and An amplitude modulated radio frequency carrier with virtually no sideband energy is generated therefrom. A device configured to 81. 39. The method of claim 38, wherein the frequency of the analog modulated signal is radio frequency. The way it works out is that the wave number is higher than the frequency of the carrier. 82. 49. The method of claim 48, wherein the frequency of the digital modulation signal is The frequency of the radio frequency carrier is higher than that of the radio frequency carrier. 83. 58. The apparatus of claim 57, wherein the frequency of the analog modulation signal is A device whose wave number is higher than the frequency of the carrier. 84. 69. The method of claim 68, wherein the frequency of the digital modulation signal is The frequency of the radio frequency carrier is higher than that of the radio frequency carrier.