JP3059644B2 - Auxiliary device for analog signal communication device and communication device using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary device which can be connected to an analog signal communication device to form a simple digital signal communication device.

[0002]

2. Description of the Related Art An analog FPU (Field PickUp) communication device (hereinafter abbreviated as "communication device") having a configuration shown in FIG. 6 is widely used for terrestrial transmission of video signals. FIG.
, The NTSC signal (television signal) input from the input terminal 2 of the analog FPU transmitting apparatus 1 is frequency-modulated (hereinafter referred to as FM modulation) by an FM modulation circuit 3. Then, after being amplified by the transmission amplifier circuit 4, it is radiated from the antenna 5. On the other hand, in the analog FPU receiver 6, the antenna 7
The signal received and amplified by the reception amplifier circuit 8 is demodulated by the FM demodulation circuit 9, returned to the NTSC signal again, and output to the output terminal 10.
Output from

[0003] When a signal to be transmitted is a digital signal, there are advantages that the transmission distance can be extended without being affected by noise and that circuit adjustment becomes easy. Therefore, an analog signal is converted into a digital signal, and BPSK and QPS suitable for digital signal transmission are used.
K, 16QAM etc. (Heiichi Yamamoto, "Satellite Communication" Maruzen, pp7
A digital FPU that modulates and transmits the modulated signal using the modulation method 0) is under study.

FIG. 7 shows an example of the configuration of this digital FPU device. NTS input from input terminal 11 of transmitting device
The C signal (television signal) is output from the NTSC-YUV conversion circuit 1
2 separates the signal into a luminance signal Y and two color difference signals U and V. After being converted into a digital signal by the A / D conversion circuit 13, the code amount is compressed by the image compression circuit 14. The image compression signal output from the image compression circuit 14 is converted by an error correction encoding circuit 15 into another code that can be corrected to a correct code when an error occurs. Error correction coding circuit 1
The error correction coded signal (binary digital signal) output from 5 is modulated by the BPSK modulation circuit 16, amplified by the transmission amplification circuit 4, and radiated from the antenna 5.

On the other hand, in the receiving device, a signal received and amplified by the antenna 7 and the receiving amplifier circuit 8 is demodulated by the BPSK demodulating circuit 19. The error correction coded signal (binary digital signal) demodulated by the BPSK demodulation circuit 19 is converted into a correct image compression signal by the error correction circuit 20. The image compression signal decompression circuit 21, the D / A conversion circuit 22, and the YUV-
The signal is returned to the NTSC signal again by the NTSC conversion circuit 23 and output from the output terminal 24.

[0006]

The analog FPU shown in FIG. 6 is a very expensive device. On the other hand, in the digital FPU of FIG. 7, the part of the BPSK modulation circuit 16, the transmission amplification circuit 4 and the antenna 5 in the transmission device, and the part of the antenna 7, reception amplification circuit 8 and the BPSK demodulation circuit 19 in the reception device are included. 6 performs the same function as the analog FPU of FIG. 6, and the circuit scale becomes almost the same or slightly larger. Therefore, even this circuit portion alone becomes an expensive device that is as high as or slightly higher than the analog FPU. Also,
An image compression circuit 14 and an image compression signal decompression circuit 21 are further added to the digital FPU. Moreover, the image compression circuit 14
The image compression signal decompression circuit 21 is a complicated circuit and has a large circuit scale. At present, the price is similar to or higher than that of the analog FPU. That is, the digital FPU is more expensive than the analog FPU which is expensive by itself, and is a device which is very difficult to purchase.

As means for solving this problem, a BPSK modulation circuit 16, a transmission amplifier circuit 4,
The part of the antenna 5 or further the error correction coding circuit 15
A digital FPU modulator 25 (shown by a broken line in FIG. 7) having
Method of separating into two devices (the receiving device is also a digital FPU
(Separated into a demodulation device 27 and an image compression signal decompression device 28)
Can be considered. In this way, two expensive circuits are separated into each device. Therefore, the price of a pair of devices of a digital FPU modulator and a digital FPU demodulator and a pair of devices of an image compression device and an image compression signal decompression device are as follows.
In each case, the price is almost the same as the price of the analog FPU and about half the price of the digital device shown in FIG.

[0008] However, it is still difficult for a purchaser who purchases this device to configure a communication device to purchase these two pairs of devices at once. For this reason, purchases are made sequentially over several years, but the previously purchased equipment must be stacked in a warehouse until all the equipment is collected, which is uneconomical.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to add to a conventional analog communication device, thereby making it possible to form a simple digital communication device at the same cost as the analog communication device. It is an object of the present invention to provide an auxiliary device for a communication device, or a communication device using these auxiliary devices, which can configure a digital communication device in stages.

[0010]

Means for Solving the Problems In order to achieve the above object, the present invention is configured as follows.

(1) A transmission auxiliary device connected to an analog signal transmission device to constitute a simplified digital signal transmission device, wherein a binary-to-N-value conversion circuit converts a digitized signal into an N-value signal. (However, N = 4, 8, 16, 3
2,...) And a multi-level signal output terminal for outputting an N-level signal.

(2) A receiving auxiliary device for connecting to an analog signal receiving device to constitute a simplified digital signal receiving device, wherein a multi-level signal input terminal for inputting an N-level signal and an N-level signal This is a reception auxiliary device having an N-value / two-value conversion circuit (N = 4, 8, 16, 32,...) For converting into a binary signal. (3) Simple digital by connecting to analog signal transmitter
A transmission auxiliary device for configuring a signal transmission device,
At least, the input digital signal
Error correction coding circuit for performing coding for
A binary-to-N-value conversion circuit (where N
= 4,8,16,32, ..) and outputs an N-value signal
Transmission auxiliary device having a multi-level signal output terminal for
You. (4) Simple digital by connecting to analog signal receiver
A reception auxiliary device for configuring a signal receiving device,
At least a multi-level signal input terminal for inputting an N-level signal
And an N-value / binary conversion circuit for converting the N-value signal into a binary signal.
Road (however, N = 4, 8, 16, 32, ...) and this time
Error correction circuit for correcting a code error of the output of the path
It is a reception auxiliary device.

(5) A transmission auxiliary device for configuring a simplified digital signal transmission device by connecting to an analog signal transmission device or configuring a digital signal transmission device by connecting to a digital signal modulation device, To A /
A compression device for performing D-conversion and compression, an error correction encoding circuit for performing encoding for error correction on an output of the device, and a binary-N-value conversion circuit for converting the output of this circuit into an N-value signal ( N = 4, 8, 16, 32,...) And a multi-level signal output terminal for outputting an N-level signal, an output terminal for outputting the output signal of the compressor to the outside, A transmission auxiliary device having at least one output signal terminal among output terminals for outputting an output signal of the correction encoding circuit to the outside.

(6) An auxiliary reception device for configuring a simplified digital signal receiving device by connecting to an analog signal receiving device or configuring a digital signal receiving device by connecting to a digital signal demodulating device, A multi-level signal input terminal for inputting a signal; and an N-level / binary conversion circuit (where N = 4, 8, 16, 16)
2, ..), an error correction circuit for correcting a code error of the output of this circuit, and a compressed signal of the output of this circuit is decompressed.
An input terminal for externally inputting a signal to be input to the error correction circuit, and an externally inputting signal to be input to the compressed signal expanding device. This is a reception auxiliary device having at least one input terminal among input terminals for performing the operation.

(7) The transmission auxiliary device according to (5) , further including a second error correction encoding circuit to which an output of the compression device is input, and an output terminal connected to an output of the circuit.

(8) In (6) , a reception auxiliary having a second error correction circuit whose output is input to the compression signal decompression device, and an error correction coded signal input terminal connected to the input of this circuit. Device.

(9) The transmission auxiliary device according to (7) , further having a compression signal output terminal for outputting an output signal of the compression device to the outside.

(10) The reception auxiliary device according to (8) , further including a compression signal input terminal for externally inputting a signal input to the compression signal decompression device.

(11) A transmission device in which an analog signal transmission device having an FM modulation circuit and a transmission auxiliary device according to any one of items 1, 3, 5, 7, and 9 are connected.

(12) A receiving device in which an analog signal receiving device having an FM demodulation circuit and a receiving auxiliary device of any one of the items 2, 4, 6, 8, and 10 are connected.

(13) Digital modulator, 5, 7,
A transmission device connected to the transmission auxiliary device according to any one of items 9 .

(14) A digital demodulator, 6, 8,
A receiving device connected to the receiving auxiliary device according to any one of items 10 .

(15) A relay auxiliary device that is connected between an analog signal receiving device having an FM demodulation circuit and an analog signal transmitting device having an FM modulation circuit to configure a relay device, and receives an N-value signal. Signal input terminal and an N-value to binary conversion circuit (where N = 4, 8, 1
6, 32,...), An error correction circuit, an error correction encoding circuit, a binary-N value conversion circuit, and a multi-level signal output terminal for outputting an N-level signal. is there.

(16) A relay device in which a relay auxiliary device according to item 15 is connected between an analog signal receiving device having an FM demodulation circuit and an analog signal transmitting device having an FM modulation circuit.

[0025]

The transmission auxiliary device and the reception auxiliary device according to the present invention are
For example, when applied to an FPU for transmitting an image signal, the transmission auxiliary device and the reception auxiliary device include only the image compression circuit 14 or the image compression signal expansion circuit 21 as expensive circuits. Therefore, the price of the transmission auxiliary device and the reception auxiliary device can be almost the same as that of the analog FPU, that is, about half the price of the digital FPU in FIG. Further, when the radio band used is the same, when transmitting a binary digital signal by the FM modulation method, BPSK, Q
Compared to the case of using a modulation method suitable for transmitting a digital signal such as PSK or 16QAM, the transmission rate (the amount of code that can be transmitted in a certain time) is small, and the transmission of an image signal capable of achieving a certain or more image quality is achieved. Runs short.

However, in the transmission auxiliary device and the reception auxiliary device according to the present invention, the binary digital signal is converted into a multi-valued binary signal by the binary-N-value conversion circuit to compensate for the insufficient transmission rate. Then, the multi-level signal (an analog signal that can be directly input to the FM modulation circuit) is output. Therefore, a communication device having a performance similar to that of the digital FPU shown in FIG. 7 can be configured only by transmitting the multi-level signal through the analog FPU already used. That is, when purchasing the digital FPU of FIG. 7 and purchasing the transmission auxiliary device and the reception auxiliary device of the present invention at about half the price and connecting them to the analog FPU already used, the full-scale digital Simple digital FPU with performance close to FPU
Can be configured at low cost.

Further, the transmission auxiliary device according to the above ( 5 ) has an output terminal for outputting a compressed image signal which is a signal before binary-N value conversion or an error correction coded signal. Similarly, the reception assisting device according to the means ( 7 ) has an input terminal for inputting a compressed image signal or an error correction coded signal. Then, by connecting the transmission auxiliary device and the digital FPU modulation device 25 in FIG. 7 and the digital FPU demodulation device 27 and the reception auxiliary device via these terminals, the same configuration as the full-scale digital FPU in FIG. A communication device can be configured. The digital FPU modulator 25 and the digital FPU demodulator 2
7, the price of a pair of devices is the analog FPU
It is almost the same as the price.

For this reason, first, a transmission auxiliary device and a reception auxiliary device are purchased and connected to an analog FPU to form a simplified digital FPU having performance close to that of a full-scale digital FPU. Then, while using this simplified digital FPU, it is necessary to construct a full-scale digital FPU.
You can wait for another opportunity to purchase the remaining equipment. After a certain period of time, a pair of digital FPU modulation device 25 and digital FPU demodulation device 27 is purchased again and connected to the already purchased transmission auxiliary device and reception auxiliary device, thereby realizing a full-scale digital FPU. Can be configured. That is, due to lack of funds, a pair of a transmission auxiliary device and a reception auxiliary device, and a digital FPU
Even if a pair of modulators and digital FPU demodulators must be purchased in stages, there is no waste in stacking the previously purchased devices in a warehouse until they are all complete. Purchase method becomes possible.

Further, the transmission auxiliary device and the reception auxiliary device according to the above ( 7 ) and ( 8 ) are capable of providing, in addition to the first error correction circuit suitable for the FM modulation method, a second error correction circuit suitable for the BPSK modulation method. 2 error correction circuits. Therefore, the digital FPU modulator and the digital FPU demodulator are
Even when no error correction coding circuit or error correction circuit is provided, a full-scale digital FPU can be reliably formed by connecting the transmission auxiliary device and the reception auxiliary device.

Further, in the relay assisting device according to the above-mentioned ( 9 ), the N-value signal output from the analog signal receiving device is returned to a binary digital signal. After correcting the code error, the signal is converted into an N-value signal again and output to the analog signal transmitting apparatus. Therefore, if this relay auxiliary device is used, it is possible to construct a simple digital relay device that can remove the influence of noise mixed in during the relay simply by connecting this inexpensive relay auxiliary device to the analog relay device that is already possessed. I can do it.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A communication apparatus according to a first embodiment of the present invention is constructed by using a newly purchased transmission auxiliary apparatus and reception auxiliary apparatus, and an analog FPU transmitting apparatus and analog FPU receiving apparatus already used. FIG. 1 shows a configuration example of the apparatus. In FIG. 1, the NTSC signal (television signal) input from the input terminal 11 of the transmission auxiliary device 29 is, like FIG. 7, the NTSC-YUV conversion circuit 12, the A / D conversion circuit 1
3. The image is converted into an image compression signal by the image compression circuit 14. Then, the error correction coding circuit 30 converts the signal into an error correction coded signal suitable for the method of the present embodiment. The error correction coded signal output here is a binary digital signal. As shown schematically in FIG. 2, the binary-to-four-level conversion circuit 31 converts the binary digital signal into a set of two bits, each of which corresponds to one of four levels. Into an analog quaternary signal consisting of The analog quaternary signal output from the multi-level signal output terminal 32 is input to the input terminal 2 of the analog FPU transmitting device 1 through a connection line,
The signal is modulated into an FM signal and transmitted as a radio wave from the antenna.

The analog FPU receiving device 6 that has received the transmitted FM signal FM-demodulates the received signal and outputs it. At this time, the output terminal 1 of the analog FPU receiver 6
The signal output from 0 is an analog quaternary signal. The quaternary signal is supplied to the multi-value signal input terminal 3 of the reception auxiliary device 34.
The signal is input to the quaternary-to-two-value conversion circuit 36 through 5. Then, by performing an inverse conversion of the conversion performed by the binary-to-four-level conversion circuit 31, the signal is returned to an error correction coded signal composed of a binary digital signal. The binary error correction coded signal is input to the error correction circuit 37, and the error correction of the code corresponding to the error correction coding circuit 30 is executed. The image compression signal obtained by correcting the code error is output to the image compression signal decompression circuit 21, the D / A conversion circuit 22, the YUV-N
The signal is returned to the NTSC signal again by the TSC conversion circuit 23,
Output from the output terminal 24.

As described above, according to the present embodiment, only a transmission auxiliary device and a reception auxiliary device which are about half the price of the full-scale digital FPU of FIG. By simply connecting to an analog FPU receiving apparatus, it is possible to configure a simplified digital FPU having a performance close to that of a full-scale digital FPU, which is less affected by noise and can extend the transmission distance.

FIG. 3 shows a configuration example of a digital FPU according to the second embodiment of the present invention. FIG. 3 shows that when a transmission auxiliary device and a reception auxiliary device are already in use, a newly purchased digital FPU modulator (modulation method will be described as using BPSK) and a digital FPU demodulator are used. 3 is a configuration example of a communication device when configuring an FPU. The error correction coding circuit 15 in the digital FPU modulation device 25 in FIG. 3 is the same error correction coding circuit as in FIG. 7 suitable for the BPSK modulation method. The error correction circuit 20 in the digital FPU demodulator 27 is the same error correction circuit as that of FIG. The transmission auxiliary device 29 has an image compression signal output terminal 38 for outputting the output signal of the image compression circuit 14 to the outside. Similarly, the reception auxiliary device 34
An image compression signal input terminal 39 for externally inputting a signal input to the image compression signal decompression circuit 21 is provided.
In this embodiment, the image compression signal output terminal 38 is used by connecting to the input terminal 40 of the digital FPU modulator 25, and the output terminal 41 of the digital FPU demodulator 27 is connected to the image compression signal input terminal 39.

In FIG. 3, an image compression signal obtained by image compression in the same manner as in the first embodiment is supplied to an image compression signal output terminal 3.
8 through an input terminal 40 of the digital FPU modulator 25 and input to the error correction coding circuit 15 in the digital FPU modulator 25. Then, the BPSK signal modulated by the BPSK modulation circuit 16 is transmitted as a radio wave from the antenna. In the digital FPU demodulation device 27 that has received the transmitted BPSK signal, the received signal is demodulated by the BPSK demodulation circuit 19. The error correction circuit 20 corrects a code error. The image compression signal obtained by correcting the code error is
An output terminal 41 of the digital FPU demodulator 27 and an image compression signal input terminal 39 are passed through the image compression signal decompression circuit 21.
To enter. Then, as in the first embodiment, N
The signal is returned to the TSC signal and output from the output terminal 24.

In general, when transmitting a binary digital signal by the FM modulation method through a transmission system having a limited frequency band, a modulation method suitable for transmitting a digital signal such as BPSK, QPSK, or 16QAM is used. The transmission rate, which is the amount of codes that can be transmitted per unit time, is smaller than in the case. In the first embodiment, the shortage of the transmission rate was compensated for by multi-leveling. When a multi-level digital signal is transmitted by the FM modulation method, the influence of noise is greatly reduced as compared with the case where an analog NTSC signal is directly FM-modulated and transmitted, so that the transmittable distance can be extended. However, BPSK suitable for digital signal transmission
As compared with the case of using a modulation method such as the above, the influence of noise is slightly increased, and the transmission distance is slightly shortened.

In this embodiment, BPSK, which is one of the modulation methods suitable for digital signal transmission, is used. For this reason, it is possible to further extend the transmittable distance as compared with the communication device of the first embodiment. Alternatively, the transmission rate can be further increased. As described above, according to this embodiment, when the transmission auxiliary device and the reception auxiliary device are already used, the digital FPU modulation device 25 and the digital FPU demodulation device 27 which are about half the price of the full-scale digital FPU of FIG.
A full-fledged digital FP that can be transmitted over a longer distance than the communication device of the first embodiment simply by purchasing a new
U can be configured.

FIG. 4 shows a configuration example of a digital FPU according to the third embodiment of the present invention. FIG. 4 shows that when a transmission auxiliary device and a reception auxiliary device are already used, a fully purchased digital FPU modulator (modulation method is described as using BPSK) and a digital FPU demodulator are used. 10 is another communication device configuration example when configuring an FPU. 4 includes a digital FPU modulator 42 having no error correction coding circuit 15 and a digital FPU demodulator 43 having no error correction circuit 20.
Is different from the device configuration of FIG. Further, a transmission auxiliary circuit having an error correction coding circuit 30 as a first error correction coding circuit suitable for FM modulation and an error correction coding circuit 15 as a second error correction coding circuit suitable for BPSK modulation. The point that the device 44 is used is different from the device configuration of FIG.
Also, a reception auxiliary having an error correction circuit 37 as a first error correction circuit corresponding to the error correction coding circuit 30 and an error correction circuit 20 as a second error correction circuit corresponding to the error correction coding circuit 15 is provided. The point that the device 45 is used is different from the device configuration of FIG. In the present embodiment, the error correction encoding circuit 15 which is the second error correction encoding circuit in the transmission auxiliary device 44 is used.
Is connected to an input terminal 47 of the digital FPU modulation device 42. The output terminal 48 of the digital FPU demodulator 43 is used by connecting it to a correction coded signal input terminal 49 for externally inputting a signal input to the error correction circuit 20 as a second error correction circuit.

In FIG. 4, an image compression signal obtained by image compression in the same manner as in the first embodiment is applied to an error correction coding circuit 15.
After converting the signal into an error-correction coded signal, the signal passes through an error-correction coded signal output terminal 46 and an input terminal 47 of the digital FPU modulation device 42,
Input to the PSK modulation circuit 16. Then, the radio wave is transmitted from the antenna. The digital FPU demodulator 43, which has received the transmitted BPSK signal,
The signal is demodulated by the PSK demodulation circuit 19. The error-correction coded signal obtained by demodulation is input to the error correction circuit 20 through an output terminal 48 and a correction coded signal input terminal 49. Then, the image compression signal obtained by correcting the code error is returned to the NTSC signal again as in the first embodiment, and is output from the output terminal 24. As described above, according to the present embodiment, as in the second embodiment, when the transmission auxiliary device and the reception auxiliary device are already used, the digital FPU which is about half the price of the full-scale digital FPU of FIG. By purchasing only the modulator 42 and the digital FPU demodulator 43 newly, a full-fledged digital FPU capable of transmitting data at a longer distance than the communication device of the first embodiment can be constructed.

FIG. 5 shows an example of the configuration of a relay device according to the fourth embodiment of the present invention. FIG. 5 is a configuration example of a relay device configured using the newly purchased relay auxiliary device 50 and the analog FPU receiving device 6 and the analog FPU transmitting device 1 already used. The analog FPU receiver 6 shown in FIG. 5 receives the FM signal transmitted by converting the binary digital signal into a quaternary signal in the same manner as in the first embodiment, for example.
M demodulated and output. At this time, the output signal is an analog quaternary signal. This quaternary signal is transmitted to the relay auxiliary device 5.
The signal is input to a quaternary-to-binary conversion circuit 36 through a multi-level signal input terminal 51 of 0, and is returned to an error correction coded signal composed of a binary digital signal. Then, by the error correction circuit 37,
The error is corrected back to a correct binary digital signal. Thereafter, the error correction coding circuit 30 and the binary-to-four-level conversion circuit 31 convert the signal into an analog four-level signal again. The analog quaternary signal output from the multi-level signal output terminal 52 is input to the analog FPU transmitting apparatus 1 through the input terminal 2 and
The signal is modulated into an M signal and transmitted from an antenna as a radio wave. As described above, according to the present embodiment, compared to the case of purchasing a digital FPU transmission / reception device or a digital FPU dedicated relay device, only the relay auxiliary device 50 whose circuit is relatively simple and which can be manufactured at low cost is newly purchased. By simply connecting to an analog FPU receiving device and an analog FPU transmitting device that are already in use, or by incorporating it into a relay device for an analog FPU that is already in use, the transmission distance is extended without being affected by noise. A simple digital FPU relay device capable of performing the above can be configured.

In the third embodiment (FIG. 4), the second error correction coding circuit 15 is provided as a transmission auxiliary device connected to the digital FPU modulator 42 having no error correction coding circuit 15. A transmission auxiliary device 44 was used.
However, as in the transmission auxiliary device 29 of FIG. 1, a transmission auxiliary device having an error correction coded signal output terminal 53 capable of outputting the output signal of the error correction coding circuit 30 to the outside is used. Further, the IC or the circuit board on which the error correction coding circuit 30 is mounted is replaced with an IC or a circuit board on which a circuit having the same configuration as the error correction coding circuit 15 of FIG. 4 suitable for the BPSK modulation method is mounted. Then, an error correction coded signal output terminal 53 of the transmission auxiliary device 29 and the digital FP of FIG.
Obviously, the input terminal 47 of the U modulator 42 may be connected.

Similarly, as in the case of the reception auxiliary device 34 of FIG. 1, a reception auxiliary device in which a correction coded signal input terminal 54 capable of externally inputting a signal to the error correction circuit 37 is used. Further, an IC or a circuit board on which the error correction circuit 37 is mounted is connected to the error correction circuit 2 shown in FIG.
Replace with an IC or circuit board on which a circuit having the same configuration as 0 is mounted. Then, the digital FPU demodulator 43 shown in FIG.
It is obvious that the output terminal 48 of the receiving auxiliary device 34 may be connected to the correction coded signal input terminal 54 of the receiving auxiliary device 34.

Further, the analog FPU transmitting apparatus 1 (FIG. 1)
Is replaced with the digital FPU modulator 25 (FIG. 3) or the digital FPU modulator 42 (FIG. 4), the transmission rate, which is the amount of codes that can be transmitted, changes. Therefore, as shown in FIG. 3, it is preferable to provide a switch 55 for changing the compression ratio when the image is compressed by the image compression circuit 14 in accordance with the modulation method to be used. Alternatively, as shown in FIG. 4, an IC memory 56 for storing a compression rate corresponding to the transmission rate of the modulation method to be used is prepared, and a value stored in this memory is rewritten or replaced with an IC memory storing another value. It is preferable to configure in advance.

FIG. 2 shows an example of the correspondence relationship in the binary / four-value conversion circuit. However, it goes without saying that this correspondence can be set arbitrarily. Alternatively, further, a binary digital signal is converted into N = 4, 8, 16, 3
Obviously, a binary-to-N-value conversion circuit for converting into an arbitrary multi-value satisfying 2,... And an N-value-to-binary conversion circuit for performing the inverse conversion may be used.

In each of the apparatuses shown in FIGS. 1, 3, and 4,
Value-4 value conversion circuit 31, image compression circuit 14, and 4-value-
The case where the binary conversion circuit 36 and the image compression signal decoding circuit 21 are integrated has been described. However, it is clear that the apparatus may be separated into a plurality of devices by, for example, a method of dividing into two at the position indicated by the broken line in FIG.

As described above, the transmission auxiliary device and the reception auxiliary device according to the embodiment of the present invention can be manufactured at the same price as a conventional analog FPU. For this reason, those who use the analog FPU need only purchase a transmission auxiliary device and a reception auxiliary device at a price similar to that of the analog FPU and connect them to the analog FPU already possessed.
It is possible to construct a simple digital FPU device having performance close to that of a full-scale digital FPU which is about twice as expensive as U. In addition, those who use the transmission auxiliary device and the reception auxiliary device according to the present invention require a digital FPU modulation device and a digital FPU device which are similar in price to an analog FPU.
Just buy a demodulator and connect it to your existing transmission and reception auxiliary devices,
It is possible to construct a full-fledged digital FPU itself, which is about twice as expensive.

As a digital modulation method, BPS
The description has been made using the K method. But QPSK, 16QAM
It is clear that the present invention can be applied to any modulation scheme such as. Also, while the above has been described using the analog FPU communication device,
Obviously, any analog signal communication device having an FM modulation circuit and an FM demodulation circuit may be used.

[0048]

According to the present invention, when a transmission auxiliary device and a reception auxiliary device are purchased, a simple digital communication device can be gradually converted into a full-scale expensive digital communication device, and the purchase can be easily performed. Become. Also, when purchasing in stages, the previously purchased device can be used even if it is connected to an already owned device. Therefore, it is possible to avoid uneconomical purchases such as stacking in a warehouse until everything is available. Further, by using the relay auxiliary device according to the present invention, a simple digital relay device that can remove the influence of noise that is mixed in the middle of the relay simply by connecting this inexpensive relay auxiliary device to the analog relay device that is already in possession is provided. Can be configured.

[Brief description of the drawings]

FIG. 1 is a simplified digital FPU according to a first embodiment of the present invention;
It is a block diagram of a communication apparatus.

FIG. 2 is an explanatory diagram of binary-N-value conversion.

FIG. 3 is a full-scale digital FP according to a second embodiment of the present invention.
It is a block diagram of a U communication apparatus.

FIG. 4 is a full-scale digital FP according to a third embodiment of the present invention.
It is a block diagram of a U communication apparatus.

FIG. 5 is a simplified digital FPU according to a fourth embodiment of the present invention.
It is a block diagram of a relay device.

FIG. 6 is a configuration diagram of a conventional analog FPU communication device.

FIG. 7 is a configuration diagram of a conventional full-scale digital FPU communication device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 analog FPU transmission device 3 FM modulation circuit 4 transmission amplification circuit 5, 7 antenna 6 analog FPU reception device 8 reception amplification circuit 9 FM demodulation circuit 2, 11, 40, 47 input terminal 12 NTSC-YUV conversion circuit 13 A / D conversion circuit 14 Image compression circuit 15, 30 Error correction coding circuit 16 BPSK modulation circuit 19 BPSK demodulation circuit 20, 37 Error correction circuit 21 Image compression signal decoding circuit 22 D / A conversion circuit 10, 24, 41, 48 Output terminal 25,42 Digital FPU modulation device 27,43 Digital FPU demodulation device 29,44 Transmission auxiliary device 31 Binary-to-four-value conversion circuit 32,52 Multi-valued signal output terminal 34,45 Reception-related device 35,51 Multi-valued signal input terminal 36 4-level to 2-level conversion circuit 38 Image compression signal output terminal 39 Image compression signal input terminal 46, 53 Error correction coded signal output terminal 49, 54 Correction coded signal input terminal 50 Relay auxiliary device 55 Switch 56 IC memory

Claims (16)

(57) [Claims] 1. A transmission auxiliary device connected to an analog signal transmission device to constitute a simplified digital signal transmission device, comprising: a binary-to-N-value conversion circuit for converting a digitized signal into an N-value signal. However, N = 4, 8, 16, 32,
..), and a multi-level signal output terminal for outputting an N-level signal. 2. A receiving auxiliary device connected to an analog signal receiving device to constitute a simplified digital signal receiving device, comprising: a multi-value signal input terminal for inputting an N-value signal; An N-ary to binary conversion circuit (where N = 4, 8, 16, 32,...) For converting into a value signal. 3. A simple data processing device connected to an analog signal transmitting device.
It is a transmission auxiliary device for configuring a digital signal transmission device.
And at least errors in the input digital signal
An error correction encoding circuit that performs encoding for correction;
Binary-N-value conversion circuit for converting the output of the circuit into an N-value signal
(However, N = 4, 8, 16, 32, ...) and N value signal
And a multi-level signal output terminal for outputting
Auxiliary transmission device . 4. A simple data processing device connected to an analog signal receiving device.
Auxiliary device for configuring a digital signal receiver
A multi-level signal for inputting at least an N-level signal
An input terminal and an N value-two value for converting the N value signal into a binary signal
A conversion circuit (where N = 4, 8, 16, 32,...)
An error correction circuit that corrects a code error in the output of this circuit
A reception auxiliary device, comprising: 5. A transmission auxiliary device for connecting to an analog signal transmitting device to form a simplified digital signal transmitting device or for connecting to a digital signal modulating device to form a digital signal transmitting device, wherein the analog signal is transmitted. A compression device that performs A / D conversion and compression, an error correction encoding circuit that performs encoding for error correction on the output of the device, and a binary-N-value conversion that converts the output of this circuit into an N-value signal. A circuit (where N = 4, 8, 16, 32,...) And a multi-value signal output terminal for outputting an N-value signal, and an output terminal for outputting the output signal of the compressor to the outside. And an output terminal for outputting an output signal of the error correction coding circuit to the outside. 6. A receiving auxiliary device for configuring a simplified digital signal receiving device by connecting to an analog signal receiving device or configuring a digital signal receiving device by connecting to a digital signal demodulating device, comprising an N-value signal. And a multi-level signal input terminal for inputting an N-value signal and an N-value / binary conversion circuit (where N = 4, 8, 16, 32,
..), an error correction circuit for correcting a code error in the output of this circuit, and a D / A
An input terminal for externally inputting a signal to be input to the error correction circuit, and an externally inputting signal to be input to the compressed signal decompressing device. Characterized in that it has at least one of the input terminals of (1). 7. The transmission auxiliary device according to claim 5 , further comprising a second error correction coding circuit to which an output of the compression device is inputted, and an output terminal connected to an output of the circuit. . 8. The apparatus according to claim 6 , further comprising a second error correction circuit whose output is input to the compression signal decompression device, and an error correction coded signal input terminal connected to an input of this circuit. A receiving auxiliary device. 9. The transmission auxiliary device according to claim 7 , further comprising a compression signal output terminal for outputting an output signal of the compression device to the outside. 10. The receiving auxiliary device according to claim 8 , further comprising a compressed signal input terminal for externally inputting a signal to be input to the compressed signal decompressing device. 11. A transmission device comprising an analog signal transmission device having an FM modulation circuit and the transmission auxiliary device according to any one of claims 1, 3, 5, 7, and 9 . 12. A receiving apparatus comprising: an analog signal receiving apparatus having an FM demodulation circuit; and the receiving auxiliary apparatus according to any one of claims 2, 4, 6, 8, and 10 . 13. A digital modulation device ,
10. A transmission device connected to the transmission auxiliary device according to any one of items 7 and 9 . 14. A digital demodulation device , comprising:
8. A receiving device connected to the receiving auxiliary device according to any one of items 8 and 10 . 15. A relay auxiliary device connected between an analog signal receiving device having an FM demodulation circuit and an analog signal transmitting device having an FM modulation circuit to constitute a relay device, and receiving an N-value signal. Signal input terminal and an N-value / binary conversion circuit (where N = 4, 8, 16, 3
2,...), An error correction circuit, an error correction encoding circuit, a binary-N-value conversion circuit, and a multi-value signal output terminal for outputting an N-value signal. Auxiliary equipment. 16. A relay device comprising the relay auxiliary device according to claim 15 connected between an analog signal receiving device having an FM demodulation circuit and an analog signal transmitting device having an FM modulation circuit.