JP2002368690A - Multimedia signal optical transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multimedia signal optical transmission system that converts a video signal and/or an audio signal and/or a data signal or the like into an optical signal, transmits the optical signal, converts a received signal into a digital signal, outputs the digital signal or reconverts the digital signal into analog signal, and outputs the analog signal. SOLUTION: The multimedia signal optical transmission system is configured with a TX section applying A/D conversion to an analog signal, converts the converted digital signal into an optical signal and transmits the optical signal, and an RX section converts a received optical signal into a digital signal and outputs the digital signal or applies A/D conversion to the digital signal and outputs the converted analog signal. Units are connected sequentially in cascade form, through optical transmission and each unit is configured to output an analog signal or a digital signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical transmission system for a multimedia signal, and more particularly to a low-cost system capable of transmitting a video signal, an audio signal, and a data signal without attenuating or deteriorating and outputting the signal at each UNIT. The present invention relates to a multimedia signal light transmission system suitable for long-distance transmission which is space-saving.

[0002]

2. Description of the Related Art In a conventional optical transmission system, a method of splitting and retransmitting a signal by a splitter when continuously transmitting is adopted. In a method using a splitter, an optical signal is differentiated and attenuated and transmitted. It was common that sex became worse. For this reason, it has been considered that long-distance transmission is difficult in a method of differentiating an optical signal. In addition, when transmitting over long distances, it is necessary to connect with a cord, and the range in which the cord can be installed is of course limited, and the cord laid therefor has a drawback that it is very obstructive. Was. Also, the installation cost of the fiber line is very high, and unfortunately, an inexpensive optical transmission system has not been provided.

Until now, as a low-cost transmission method, it has been general to transmit and receive analog signals by wire or wirelessly. However, analog signal transmission has the disadvantage that signal attenuation or deterioration occurs when transmitted over long distances. To compensate for this defect, equipment is always available to recover the attenuated or deteriorated signal in the receiver. There was an essential defect that had to be amplified.

[0004] Further, from the side of consumers who use data, there has been a demand for digital transmission and reception without attenuation, regardless of the cost required for installation. However, it has been considered that the optical transmission system itself is expensive and cannot be used easily. Therefore, there has been a demand from various fields for the development of a low-cost system capable of long-distance transmission.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a multimedia signal optical transmission system according to the present invention comprises:
The digital signal (video signal,
Audio signals and data signals) are converted into optical signals and transmitted as optical signals, and the digital optical signals received by the UNIT2 are converted again into digital signals and analog signals, thereby preventing light differentiation and attenuation and preventing long distances. It is an object of the present invention to provide an inexpensive multimedia signal optical transmission system that can withstand the transmission of an optical signal. In addition, U
By converting an analog signal (video signal, audio signal, data signal) into a digital optical signal in NIT1 and transmitting it as an optical signal, and converting the digital optical signal received in UNIT2 into a digital signal and an analog signal again It is an object of the present invention to provide an inexpensive multimedia signal light transmission system that prevents differentiation and attenuation of light and can withstand long-distance transmission.

Further, since a plurality of signals are input, a plurality of types of signals are selected by a selector and converted into optical signals by a TX unit, the number of signals to be transmitted is not limited. Can be used to support multiple inputs and multiple outputs. In addition, a unit that can be optically output on the UNIT2 side, output as a digital signal, and analog output as an analog signal after D / A conversion The analog signal can be output at each UNIT by branching into two types of systems, and at the same time, the digital signal that is optically output is transmitted serially to another UNIT to add the UNIT so that attenuation and Provided is a multimedia signal light transmission system capable of digital output, analog output, simultaneous output at each UNIT without deterioration, and capable of infinitely transmitting signals. It is aimed at.

[0007] The signal optically output by UNIT2 is converted into another U signal.
By transmitting serially to NIT2c, UNITn
Is an optical transmission system by cascade connection in which signals are transmitted indefinitely without attenuation or deterioration. Digital video signals and analog video signals are transmitted to each unit by N
Equipped with TSC and PAL output functions, each unit can output NTSC and PAL simultaneously or individually. Further, by adding a SECAM conversion function, all TV signals can be output. A configuration that enables conversion and output is also conceivable.

[0008]

SUMMARY OF THE INVENTION To achieve the above object, a multimedia signal optical transmission system according to the present invention converts a digital video signal into an optical signal in a TX section so as to enable long-distance transmission without attenuation or deterioration. A unit 1 that converts the signal into a signal and transmits the signal, and a unit that converts the received optical signal into a digital signal in the RX unit, outputs the digital signal, converts the digital signal from digital to analog (D / A), and then outputs the analog signal. It is. Also,
A / D (analog to digital) conversion of an analog video signal so as to enable long-distance transmission without attenuation or deterioration, and a UNIT 1 for converting a digital signal into an optical signal in the TX section and transmitting the signal, and a received optical signal Is converted into a digital signal in the RX unit and output as a digital signal.
And after D / A (digital to analog) conversion,
It is also possible to adopt a configuration consisting of UNIT2 for analog output.

A unit 1 for converting a digital audio signal into an optical signal in the TX section for transmission so as to enable long-distance transmission without attenuation or deterioration, and an R1 for receiving the received optical signal.
U is converted to a digital signal in the X section, output as a digital signal, and D / A converted, and then analog output.
It is also possible to adopt a configuration composed of NIT2. Also,
A / D conversion of an analog audio signal so as to enable long-distance transmission without attenuation or deterioration, UNIT1 for converting and transmitting the optical signal to an optical signal in the TX unit, and converting the received optical signal to a digital signal in the RX unit , Output as a digital signal, and D / A conversion, followed by unit output 2 for analog output.

[0010] It is possible to input a plurality of signals,
A plurality of input signals are selected by a selector such as a dip switch, a toggle switch, and a remote controller (infrared ray, radio wave), and then converted into an analog signal in the case of an analog signal, and then converted into an optical signal in a TX unit. UN to send
IT1 and the optical signal transmitted from UNIT1 are received and R
By converting the digital signal into a digital signal in the X section and further converting the converted digital signal into an optical signal in the TX section, a series capable of optical output, output as a digital signal, and an analog signal in the D / A section And a circuit that branches into two types of systems, a system capable of converting to a system capable of analog output
NIT2, and the signal optically output at UNIT2 is transmitted serially to another UNIT2,
By adding an NIT, it is possible to transmit a signal indefinitely without attenuating or deteriorating, and it is also possible to provide a configuration in which each unit can output a digital signal and / or an analog signal.

The UNIT 1 may be capable of supporting multiple inputs and multiple outputs by adding a plurality of TX units corresponding to a plurality of input signals. Also, UNIT1
Can input several kinds of signals, and data can be transmitted through one fiber line.

In a multimedia signal optical transmission system for transmitting and receiving a plurality of digital signals, an optical conversion step of converting a digital signal into an optical signal in a TX unit, an optical transmission step of transmitting the converted optical signal, An optical receiving step of receiving an optical signal in the RX section, a digital converting step of converting the optical signal received in the RX section into a digital signal, a digital output step of outputting a digital signal, and a digital output step of converting the digital signal into an analog signal / A conversion step;
And an analog output step of outputting the converted analog signal. Also, a multimedia signal optical transmission system for transmitting and receiving a plurality of analog signals includes an A / D conversion step of converting an analog signal into a digital signal, an optical conversion step of converting a digital signal into an optical signal in a TX unit, and a converted optical signal. An optical transmitting step of transmitting a signal, an optical receiving step of receiving the transmitted optical signal in the RX section, a digital converting step of converting the optical signal received in the RX section into a digital signal, and a digital output for outputting the digital signal A configuration including a step, a D / A conversion step of converting a digital signal into an analog signal, and an output step of outputting the converted analog signal is also possible.

[0013]

In the multimedia signal light transmission system according to the present invention, it is possible to convert a digital video signal into an optical signal with UNIT1 and output it with UNIT2. Also, digital audio signals and analog data signals are
It can be converted to an optical signal by NIT1 and output by UNIT2. Also, in the multimedia signal light transmission system according to the present invention, S, RGB, YUV, and NTSC / PAL
Convert analog video signals into optical signals with UNIT1
It is possible to output with NIT2. In addition, analog audio signals and analog data signals are also UNIT
The signal can be converted to an optical signal by 1 and output by UNIT2.

Also, a plurality of signals can be input, and a plurality of types of input signals can be selected by a selector. A signal selected by a DIP switch, a toggle switch, or a remote control selecting means is an analog signal. In this case, the signal is A / D-converted, converted to an optical signal in the TX unit, and
It is transmitted by IT1 and converted into a digital signal by the RX unit of UNIT2. The converted digital signal is converted into an optical signal by the TX unit and output as an optical signal, and a digital signal is output, and the D / A unit is converted into an analog signal and converted into two types of analog output. Fork each U
In addition to being able to output with NIT2, it is possible to make UNIT2 continuous serially.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A multimedia signal light transmission system according to the present invention will be described below in detail with reference to the embodiments shown in the drawings. FIG. 1 is a block diagram showing a basic configuration of a multimedia signal optical transmission system according to the present invention, FIG. 2 is a block diagram showing a basic configuration of analog video and audio signals, and FIG. FIG. 1 is a block diagram showing a basic configuration of a multimedia signal light transmission system including a signal, a digital or analog audio signal, and a digital or analog data signal. FIG. 4 is a block diagram when a plurality of signals are selected, and FIG. 5 is a block diagram when multiple inputs and multiple outputs are supported. FIG. 6 shows digital transmission and digital output and analog output in each UNIT2. It is a block diagram which enables it. FIG. 7 is a block diagram showing UNIT1g when a plurality of signals are input simultaneously. FIG. 8 is a flowchart showing steps when a digital signal of the multimedia signal optical transmission system is input, and FIG. 9 is a flowchart showing steps when an analog signal is input.

The multimedia signal light transmission system converts a digital signal into an optical signal in a TX unit and transmits the converted signal.
IT1 and the received optical signal are converted into a digital signal in the RX unit, and are output as a digital signal and / or
UNIT2 which performs D / A conversion and then outputs an analog signal. The multimedia signal optical transmission system converts an analog signal into a digital signal, converts the analog signal into an optical signal in the TX unit, and transmits the signal. The RX unit converts the received optical signal into a digital signal in the RX unit and outputs the digital signal. , And D
/ UNIT2 which performs analog output after A / A conversion.

Further, the multimedia signal optical transmission system 10 according to the present invention comprises: an optical conversion step 30 for converting a digital signal into an optical signal in the TX section; an optical transmission step 40 for transmitting the converted optical signal; An optical receiving step 50 for receiving the received optical signal by the RX unit, a digital converting step 60 for converting the received optical signal into a digital signal, a digital output step 70 for outputting a digital signal, and a D / A D / A to convert (from digital to analog)
This is a configuration including a step 80 and an analog output step 90 for outputting an analog signal. The multimedia signal optical transmission system 10 according to the present invention includes an A / D conversion step 20 for A / D (from analog to digital) conversion of an input analog signal, and a digital signal to an optical signal in the TX unit. An optical conversion step 30 for converting, an optical transmission step 40 for transmitting the converted optical signal, and an RX for transmitting the transmitted optical signal.
A digital receiving step 50 for converting a received optical signal into a digital signal, a digital output step 70 for outputting a digital signal, and a digital / analog (D / A to digital / analog) ) D / to be converted
A configuration including an A step 80 and an analog output step 90 for outputting an analog signal is also possible.

A digital video signal and an analog video signal are input to the UNIT 1a. Analog video signals such as S, YUV, NTSC, and PAL are decoded by RGBDecoder or directly converted to RGB.
The B signal is converted from an analog signal to a digital signal by A / D conversion. Further, the digital signal is converted into an optical signal in the TX unit in the UNIT 1a and then transmitted to the UNIT 2a. S, RGB, YUV, NTSC, and PAL are video signal systems adopted in various countries, and the present invention can deal with signals of any system.

A digital audio signal and an analog audio signal are input to the UNIT 1b. The analog signal is A / D converted by the A / D converter 12 to be digitized, and then converted into an optical signal by the TX unit 13. To send. The UNIT 2b receives the transmitted optical signal, converts it into a digital signal in the RX unit 24, outputs the digital signal, and converts the digital signal into a digital signal in the D / A converter 22 and outputs it. In this embodiment, the applicable frequency bands are 32 k (Hz) and 44.1 k (H).
z), 48k (Hz), 96k (Hz) and 192k
(Hz). However, it is sufficiently possible to use the multimedia signal light transmission system according to the present invention in other frequency bands.

FIG. 1 shows a digital video signal UNIT1a.
FIG. 3 is a block diagram showing a basic configuration of a transmission unit 1 containing a digital audio signal UNIT1b and a receiving unit 2 containing a video signal UNIT2a and an audio signal UNIT2b. The digital video signal input to the UNIT 1a, the digital signal input in the TX unit 13, and the digital signal converted from the analog signal are converted into optical signals. As a result, the color information signal is converted into digital information, and deterioration due to transmission can be avoided. The transmitted optical signal is UNIT2
a.

The UNIT 2a is a receiving unit for the transmitted optical signal and also an output unit. The optical signal transmitted from the UNIT 1a is received by the RX unit 24 and converted into a digital signal. Next, the digital signal is converted into an analog signal in the D / A converter 22 when the digital output and the analog signal are desired. In addition, NTS
The signal is converted into an analog video signal by the C / PAL encoder 26 and output.

The digital audio signal input to the UNIT 1b is converted into an optical signal by converting a digital signal input from the TX unit 13 and a digital signal converted from an analog signal. The signal of the sound information is converted into digital information, so that deterioration due to transmission can be avoided. The transmitted optical signal is transmitted to the UNIT 2b.

The UNIT 2b is a receiving part of the transmitted optical signal and also an output part. The optical signal transmitted from the UNIT 1b is received by the RX unit 24 and converted into a digital signal. Next, when a digital output or an analog signal is desired, the digital signal is converted into an analog audio signal in the D / A converter 22 and then output. This makes it possible to transmit digital video signals and digital audio signals simultaneously over a long distance without deterioration. In addition, it has become possible to realize a low-cost and space-saving system.

In this embodiment, WDM (Wavelen)
gth Division Multiplex (wavelength division multiplexing) (a technique of transmitting large-capacity data in two directions by multiplexing channels through light of different wavelengths in one optical fiber) is not employed. In the present invention, since one data transmission is transmitted by one fiber line, there is no fear of attenuation and deterioration. Also WDM
Since a lens used in an optical fiber transmission device used in the system is not required, an inexpensive device can be constructed. For example, using this system for video signals, R,
Since the G and B signals and the five signals of control and clock are divided into five and transmitted, data can be transmitted directly. Therefore, it is possible to directly transmit a large-capacity signal without attenuation and deterioration.

Since the multimedia signal light transmission system uses the above-described system, it has become possible to transmit a data signal, a video signal, an audio signal, or the like over a long distance without attenuation or deterioration. Further, the multimedia signal light transmission system is not limited to the five signals of the above-described system example, and can cope with more signals.

FIG. 2 shows an analog video signal UNIT1.
FIG. 3 is a block diagram showing a basic configuration of a transmission unit 1 including a ′ and a unit 1b ′ of an analog audio signal, and a receiving unit 2 including a unit 2a ′ of a video signal and a unit 2b ′ of an audio signal. UNIT1
The analog video signal input to a ′ is divided by the RGB decoder 11 into Red = Red, Green = Green, and Blue = Blue according to the components of each color, and is recognized as a symbol. The analog signal is converted to a digital signal in the / D converter 12. next,
Each analog signal is converted into an optical signal in the TX unit 13. As a result, the color information signal is converted into digital information, and deterioration due to transmission can be avoided. The transmitted optical signal is transmitted to the UNIT 2a '.

The UNIT 2a 'is a receiving unit for an optical signal to be transmitted and also an output unit. The optical signal transmitted from the UNIT 1a ′ is received by the RX unit 24,
It is converted to a digital signal. Next, the digital signal is converted into an analog signal in the D / A converter 22 when the digital output and the analog signal are desired. Furthermore, N
The signal is converted into an analog video signal by the TSC / PAL encoder 26 and output.

The analog audio signal input to the UNIT 1b 'is converted by the A / D converter 12 into a digital signal. Next, the analog signal is converted into an optical signal in the TX unit 13. The signal of the sound information is converted into digital information, so that deterioration due to transmission can be avoided. The transmitted optical signal is transmitted to the UNIT 2b '.

The UNIT 2b 'is a receiving unit for the transmitted optical signal as well as an output unit. The optical signal transmitted from the UNIT 1b ′ is received by the RX unit 24,
It is converted to a digital signal. Next, the digital signal is converted into an analog audio signal in the digital output and D / A converter 22, and then output. This makes it possible to simultaneously transmit analog video signals and analog audio signals over a long distance without deterioration. In addition, a low-cost, space-saving system can be realized.

In another embodiment of the present invention, UNIT2
Is further equipped with a TX unit, which can output the original digital output and / or analog output, and also serves as a relay point.
2 can be cascaded via an optical signal. It is characterized by being free from EMI, RFI, and ground loops, capable of filtering high, middle, and low frequency band components, and enabling various signal processing.

In another embodiment of the multimedia signal light transmission system according to the present invention shown in FIG. 3, a video signal, an audio signal, and a data signal are simultaneously inputted, transmitted, and transmitted.
Output is possible. In the transmission unit 1, the input digital video signal, analog video signal, digital audio signal, analog audio signal, digital data signal, analog data signal, and digital data are transmitted to the TX unit. . In the case of an analog signal, the analog video signal is composited by the RGB decoder 11, converted from an analog signal into a digital signal by the A / D converter 12, and transmitted to the TX unit. The digital signal transmitted to the TX unit is converted into an optical signal and transmitted.

The transmitted optical signal is received by the receiving unit 2. The optical signal is first received by the RX unit 24 and converted into a digital signal. When output as a digital signal, it is output as it is. D / A for analog signal
The digital signal is converted into an analog signal by the unit 22.
In the case of a video signal, the video signal is converted into an analog video signal by the NTSC / PAL encoder 26 and output.
Further, by converting the optical signal converted by the RX unit 24 into an optical signal further by the TX unit 13, the receiving units 2 can be cascaded to construct an optical transmission system that can be output over a long distance and output each. It is. In the case of a cascade connection, it is possible for each unit to convert the format such as NTSC output and PAL output and output the converted format. further,
Signals can be input and output simultaneously.

In still another embodiment of the multimedia signal light transmission system according to the present invention shown in FIG. 4, it is possible to input a plurality of signals. In the UNIT 1d, the input N kinds of digital signals or analog signals are selected by the selection means (selector) 29, and then in the case of analog signals, A / D converted, and the TX unit 13 converts them into optical signals and transmits them. . In the UNIT 2d, the transmitted signal is received by the RX unit 24 and converted into a digital signal.
On the one hand, it is output as a digital signal and / or D
The signal is converted into an analog signal by the / A converter 22 and output. On the other hand, the digital signal converted from the optical signal is
The optical signal is converted into an optical signal again by the unit 23, and the optical output is enabled serially.

Further, by serially transmitting the optical signal to another next UNIT, the subsequent UNITn can be added. This makes it possible to transmit multimedia signals infinitely over long distances without attenuation or deterioration by optical transmission. Furthermore, in the UNIT at each stage that has become a relay base for long-distance transmission, not only a simple relay but also an analog signal can be output from each UNIT, and its propagation effect can be expected. In this embodiment, a dip switch, a toggle switch, a remote controller (infrared ray, radio wave) and the like can be used as a means for selecting a plurality of inputs (selector).

The application range of this embodiment is very wide, and it is possible to reach sound quality, volume and video which do not attenuate to every corner of a large concert hall. As a result, it is possible to construct an effective audio system and video system in a mammoth concert on the outdoor stage. In addition, it can be applied to in-vehicle audio systems, audio and video systems for huge halls, etc., audio and video for karaoke boxes, aircraft, ships, trains, etc. Sound with
An imaging system can be provided. By using as a sound source HUB, audio connection of several channels becomes possible with one.

As a further embodiment, in the multimedia signal light transmission system, the number of input signals is not limited as shown in FIG. 5, and a plurality of signals are converted into optical signals by the TX unit 13 and transmitted. You. There is no limitation on the number of signals to be transmitted, and it is possible to cope with multiple inputs and multiple outputs by adding a TX unit 13 as necessary, and an RX unit 24n which is a receiving unit on the UNIT2 side is also required. This is a multimedia signal optical transmission system by optical transmission that can be sequentially added according to the requirements.

In yet another embodiment, shown in FIG.
As shown in T1f and UNIT2f, several types of signals can be input with a single fiber line in a space-saving manner. Digital signals and analog signals undergo A / D conversion, and
By converting into an optical signal in the X section, it is possible to individually transmit to each UNIT. In the case of an analog signal, the signal input to the UNIT 1f is converted from an analog signal to a digital signal by the A / D converter 12. Next, the signal is converted into an optical signal by the TX unit 13 and transmitted. The data can then be transmitted over a single fiber line. The plurality of optical signals transmitted from the TX unit 13 are digitally converted by the RX unit 24 of the UNIT 2f. The converted signal is selected by the selector unit 29,
The signal is output as a digital signal, and is divided into two types: a sequence that is converted from a digital signal into an analog signal by a D / A converter 22 and output, and a sequence that is converted into an optical signal by a TX unit 23 and can be optically output. . The optically output signal can be transmitted indefinitely without attenuation and deterioration by serially adding another UNITn. Furthermore, it is also possible to output a digital output and / or an analog signal in each stage. As a selecting means of the selector 29, a dip switch, a toggle switch, and a remote controller can be selected.

FIG. 7 is a block diagram showing the UNIT 1g when a plurality of signals are input simultaneously. For each of the input sources, the analog signal is converted from an analog signal to a digital signal by the A / D converter 12 and the selector 19
Is transmitted to In the selector 19, an audio signal, a video signal, and a data signal are respectively selected, transmitted to the next selector 19, further selected, and transmitted to the TX unit. The TX unit 13 converts a digital signal into an optical signal and transmits the optical signal.

In the operation process of the multimedia signal light transmission system, first, the A / D conversion process 20 is a process of converting an analog signal into a digital signal.

The optical conversion step 30 is an optical signal conversion step, in which a signal converted from analog to digital is converted from a digital signal to an optical signal in the TX section.

The optical transmission step 40 is an optical signal transmission step, in which the optical signal converted from the digital signal to the optical signal in the TX unit is transmitted to the UNIT2.

The optical receiving step 50 is an optical signal receiving step, in which the RX unit 24 receives the optical signal transmitted from the UNIT 1.

The digital conversion step 60 converts the optical signal received by the RX section into a digital signal.

The digital output step 70 is a step of outputting an audio signal, a video signal, and a data signal that have been converted into optical signals and transmitted as video information, audio information, and data information. A video signal, an audio signal, and a data signal are output through appropriate devices.

The D / A conversion step 80 is a step of converting a digital signal into an analog signal.

The analog output step 60 is a step of outputting an audio signal, a video signal, a data signal, or the like that has been converted into an optical signal and transmitted as video information, audio information, and data information. The video signal, the audio signal, and the data signal are output through appropriate devices.

Although it is possible to output the digital output and the analog output separately as described above, both types of output can be simultaneously performed if necessary. It is also possible to operate a plurality of output devices simultaneously.

Still another embodiment of the present invention is a cascade connection mode, in which a signal optically output by UNIT 2 is
By transmitting serially to another UNIT 2c, the UN
This is a method in which a signal is transmitted indefinitely without attenuation or deterioration by adding ITn. Digital video signals and analog video signals are transmitted to NTSC and PA
With the output function of L, each unit has its own NTS
It is possible to output as C or PAL, and it is also possible to simultaneously output in these two types. Further, by adding a SECAM conversion function, it is possible to convert and output all television signals.

[0049]

[Effect of the Invention] Video / audio data signals can be transmitted over long distances at low cost without attenuation or deterioration. Even in a big concert venue, music
Video and data can be reached in a clear state. Even on the outdoor stage, music, video, and other data can be transmitted over a wide area while keeping the installation cost low. The received optical signal is converted into a digital signal, and D / A
There is an advantage that an amplifier is not required since conversion is performed and analog output is performed. 2. Analog video / audio data signal
Since the digital signal is converted into an optical signal and transmitted after D conversion, there is no attenuation. Further, since an optical signal is converted into a digital signal, D / A converted and analog output, equipment such as an amplifier is not required, so that low cost can be realized. Analog signals can be transmitted over long distances at low cost without attenuation or deterioration.

3. Since the digital video / audio data signal is converted into an optical signal and transmitted, there is no attenuation. In addition, since the optical signal is converted into a digital signal and is directly converted into a digital signal or D / A converted and output as an analog signal, equipment such as an amplifier is not required, so that low cost can be realized. It is also possible to output digital and analog simultaneously. 4. Digitally or analogly converts video / audio data signals from digital signals to optical signals,
Since the analog is A / D converted, the digital signal is converted into an optical signal and transmitted as an optical signal, so there is no attenuation. Also,
Since the optical signal is converted into a digital signal, D / A converted, and then output as an analog signal, equipment such as an amplifier is not required, so that low cost can be realized. 5. Video, audio and data signals can be combined irrespective of digital or analog, and optical transmission from the input side to the output side can be converted to an arbitrary signal at the output side and output, so discrimination between old and new equipment It is epoch-making in that it can be connected organically without any loss and the equipment can be connected effectively without waste.

6. A plurality of all kinds of signals can be input, and the input analog signals are selected by a selector such as a dip switch, a toggle switch, a remote controller (infrared ray, radio wave), and then A.
There is no attenuation because the signal is transmitted after the / D conversion. By converting the transmitted optical signal into a digital signal and further converting it into an optical signal by the TX unit, a system capable of optical output and a system capable of converting the digital output or D / A unit to an analog signal and outputting the analog signal Since they are separated, serial optical transmission is possible via UNIT. Therefore, there is an advantage that the device can be easily carried because the device has a lightweight structure. 7. Since multiple inputs and multiple outputs can be supported by adding a plurality of TX units corresponding to a plurality of signals, there is an advantage that signals of various existing devices can be transmitted without attenuation. By adding a plurality of TX units, a plurality of signals can be input and output multiple, so that the system can be used freely. It is a small and highly durable acoustic system. Also, by using it as a sound source HUB, audio connection of several channels becomes possible with one cable.

8. Audio signal or NTSC /
Since a PAL composite signal or the like can be input and data can be transmitted through one fiber line, a complicated transmission system such as conventional multiplex transmission is not required, and a lightweight and inexpensive device can be provided. In an optical transmission system using an optical link, transmission of several channels is possible with one cable, and channel selection is also possible. Several types of signal (audio signal or NT)
SC / PAL composite signal, etc.)
In addition to the downsizing of the entire device, there is an advantage that the cost of laying the fiber line can be reduced. Further, simultaneous transmission of a plurality of channels is possible, no coupler is required, and signal attenuation and deterioration at the time of branch connection or additional connection are epoch-making, realizing high cost performance. 9. Since it is a simple process including an optical conversion process, an optical transmission process, an optical reception process, a digital conversion process, a digital output process, a D / A conversion process, and an analog output process, handling is easy. It is. As a result, it is possible to construct an effective audio system connected serially at a low cost. Long-distance transmission is possible because there is no deterioration attenuation. The present invention can be applied to an audio system for a vehicle, a sound system for a huge hall, a sound of a karaoke box, and the like, and can be applied to an aircraft, a ship, a train, and the like.

10. An A / D conversion step, a light conversion step,
Since it comprises an optical transmission step, an optical reception step, a digital conversion step, a digital output step, a D / A conversion step, and an analog output step, the configuration is simple and handling is easy. Although the configuration is simple, it is effective because attenuation and deterioration can be suppressed. In addition, it has become possible to construct a high-quality transmission system using optical transmission at low cost. 11. Since each unit is provided with an output function of NTSC and PAL, each unit can output NTSC and PAL simultaneously or individually according to their respective systems. Further, if a conversion function of SECAM is further added, all television signals can be converted and output, which is convenient.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of a multimedia signal optical transmission system according to the present invention.

FIG. 2 is a block diagram showing a basic configuration of a multimedia signal optical transmission system including an analog video signal and an audio signal.

FIG. 3 is a block diagram showing a basic configuration of a multimedia signal optical transmission system including a digital or analog video signal, a digital or analog audio signal, and a digital or analog data signal.

FIG. 4 is a block diagram when a plurality of signals are selected.

FIG. 5 is a block diagram in the case of supporting multiple inputs and multiple outputs.

FIG. 6 shows digital transmission and digital output in each UNIT2,
Block diagram that enables analog output

FIG. 7: UNIT1g when multiple signals are input simultaneously
Block diagram showing

FIG. 8 is a flowchart showing steps when a digital signal of the multimedia signal optical transmission system is input.

FIG. 9 is a flowchart showing steps in the case where an analog signal is input in the multimedia signal light transmission system of the present invention.

[Description of Signs] 1 Transmitting unit 2 Receiving unit 1a, a ', a ", b, b', b" c, d, e, f, g
UNIT 2a, a ', a ", b, b', b", c, d, f
UNIT 10 multimedia signal optical transmission system 11 RGB decoder 12 A / D converter 13 TX unit 22 D / A converter 24 RX unit 26 NTSC / PAL encoder 29 selector 20 A / D conversion process 30 optical conversion process Reference Signs List 40 light transmission step 50 light reception step 60 digital conversion step 70 digital output step 80 D / A conversion step 90 analog output step

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shinichi Sakai 2-9-5 Shinkawa, Chuo-ku, Tokyo F-term in Opti Japan Corporation 5C064 EA01 5K002 AA01 AA03 DA05 GA01 GA02

Claims (11)

[Claims] 1. A unit for converting a digital video signal and a digital audio signal into an optical signal in a TX unit and transmitting the digital signal so as to enable long-distance transmission without attenuation or deterioration, and a unit for transmitting a received optical signal in an RX unit. Convert to a digital signal, digital output and / or D
/ A (digital to analog) conversion, and a unit 2 for analog output. 2. After analog / digital (A / D) conversion of an analog video signal and an analog audio signal so as to enable long-distance transmission without attenuation or deterioration, T
U which converts a digital signal into an optical signal and transmits it in the X section
NIT1 and the received optical signal are converted into digital signals in the RX section, and digital output and / or D / A
A multimedia signal light transmission system, comprising: a unit 2 for converting (from digital to analog) and then outputting analog. 3. A unit 1 for converting a digital audio signal, a digital video signal, and a digital data signal into an optical signal in a TX unit for transmission so as to enable long-distance transmission without attenuation or deterioration, and a received optical signal. And a unit 2 for converting the digital signal into a digital signal in an RX section, and performing a digital output and / or D / A conversion and then outputting the analog signal. 4. An analog audio signal, an analog video signal, and an analog data signal are A / D-converted to enable long-distance transmission without attenuation or deterioration, and then converted to an optical signal in a TX unit and transmitted. UNI
A multimedia signal optical transmission system comprising: T1; and a UNIT2 which converts a received optical signal into a digital signal in an RX section, performs digital output and / or D / A conversion, and outputs an analog signal. 5. A video signal, an audio signal, and a data signal can be combined with each other irrespective of a digital signal and an analog signal, and optically transmitted from an input side to an output side and converted into an arbitrary signal at an output side. 4. The multimedia signal optical transmission system according to claim 1, wherein 6. A / D converter capable of inputting a plurality of signals and selecting a plurality of input analog signals by a selector such as a dip switch, a toggle switch, and a remote controller (infrared ray, radio wave). UNIT1 which converts the signal, converts it into an optical signal in the TX unit, and transmits the signal.
The optical signal transmitted from the UNIT 1 is received and converted into a digital signal by the RX unit, and the converted digital signal is further converted into an optical signal by the TX unit, thereby outputting a sequence capable of optical output and a digital signal. And / or
UNI having a circuit that branches into two types of systems, a system that converts the analog signal into an analog signal in a D / A unit and a system that can output the analog signal
T2, and the signal optically output at the UNIT2 is transmitted serially to another UNIT2, thereby
Multimedia signal light transmission characterized by being able to transmit a signal indefinitely without attenuation or deterioration and to be able to output a digital signal and / or an analog signal in each UNIT. system 7. The unit 1 has a multi-input unit by adding a plurality of TX units corresponding to a plurality of input signals.
3. The multimedia signal light transmission system according to claim 1, wherein the system can cope with multiple outputs. 8. The unit according to claim 1, wherein said UNIT1 is capable of inputting several types of signals (audio signals or NTSC / PAL composite signals, etc.), and is capable of transmitting data over a single fiber line. 1 or 2
Multimedia signal light transmission system as described 9. A multimedia signal optical transmission system for transmitting and receiving a plurality of digital signals, comprising: an optical conversion step of converting a digital signal into an optical signal in a TX unit; an optical transmission step of transmitting the converted optical signal; An optical receiving step of receiving the obtained optical signal in the RX section, a digital converting step of converting the optical signal received in the RX section into a digital signal, a digital output step of outputting a digital signal, and converting the digital signal into an analog signal A digital signal optical transmission system, comprising: a D / A conversion step for converting a signal; and an analog output step for outputting a converted analog signal. 10. A multimedia signal optical transmission system for transmitting and receiving a plurality of analog signals, comprising: an A / D conversion step of converting an analog signal into a digital signal; an optical conversion step of converting a digital signal into an optical signal in a TX unit; An optical transmitting step of transmitting the transmitted optical signal, an optical receiving step of receiving the transmitted optical signal in the RX section, a digital converting step of converting the optical signal received in the RX section into a digital signal, and outputting the digital signal A digital output process for converting a digital signal into an analog signal, and a D / A conversion process for outputting a converted analog signal. 11. A UNIT 2 optically output signal is serially transmitted to another UNIT 2 to generate a UNIT.
In a cascaded optical transmission system that transmits signals indefinitely without attenuation or deterioration, digital video signals and analog video signals
Equipped with TSC and PAL output functions, each unit can output NTSC and PAL simultaneously or individually. Further, by adding a SECAM conversion function, all TV signals can be output. A multimedia signal optical transmission system characterized by having a configuration capable of converting and outputting.