JPH02149034A - Duplexing system for order-wire line - Google Patents

Abstract

PURPOSE:To use one line as two independent lines for order-wire system by code-converting an input signal to on order-wire line into an adaptive differential PCM signal, and transmitting it to an existing device data channel. CONSTITUTION:When another voice signal (b) is outputted besides from a voice circuit 2 while the voice signal (a) is outputted from the voice circuit 1, this voice signal (b) is turned into a linear PCM signal through a PCM code circuit 4 and a PCM/LINEAR conversion circuit 8, and is inputted to an adder 10. The adder 10 adds this linear PCM signal and the linear PCM signal from the above-mentioned conversion circuit 12, and outputs them to a LINEAR/PCM conversion circuit 14. An adaptive differential PCM code circuit 18 converts the inputted PCM signal into an AD PCM signal (d) of 32kb/s, and outputs it to a multiplex circuit 20. Accordingly, two independent order-wire lines can be accepted by one line of the service data channel of 64kb/s.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is directed to two order wire lines used for transmitting information during start-up and failure of a communication system.
Regarding the weighting method.

[Conventional technology]

Multiple terminal equipment and inside! ! An order wire device is attached to an order wire line that connects devices in tandem to transmit information, and that transmits information with the order wire line when the communication system is started up or breaks down. The order wire system comprising these order wire devices and order wire lines is
One 54 kb/s service data channel is used as an order wire line, and information such as input audio signals is converted into a PCM signal and transmitted at 54 kb/s. An example of a frame structure when transmitting an audio signal in this manner is shown in FIG.

As shown in FIG. 3, the voice signal converted to a PCM signal is transmitted by a frame 210 of 200,032 bits of the service data channel.

Furthermore, the frame 210 includes an 8-bit PCM signal section 21
1 to 213 and 7 bits of P following the PCM signal section 213.
It consists of a CM signal section 214 and a 1-bit frame synchronization section 215 following the PCM signal section 214. Information such as audio signals is transmitted between any two stations using an order wire system with such a frame structure.

[Problem to be solved by the invention]

The disadvantage of transmitting information using the frame structure of the conventional order wire system described above is that when any two stations are using the service data channel with the order wire device, other stations cannot use the order wire device. There is.

The purpose of the present invention is to eliminate such drawbacks, so that when any two stations are transmitting information using one service data channel line, another station may also use this line to transmit information. The purpose of the present invention is to provide a redundant system for order wire lines that can transmit data transmission.

[Means to solve the problem]

The present invention is an order wire line duplication system in which two order wire lines are accommodated in one data channel line, and the information input to each of the order wire lines is code-converted into an adaptive differential PCM signal, and each of the above-mentioned order wire lines is multiplexing the adaptive differential PCM signals at predetermined positions of the frame format of the data channel to generate a transmission line signal, transmitting the generated transmission line signal to one line of the data channel, and transmitting the transmission line signal to the data channel line. The present invention is characterized in that, upon receiving a traffic signal, the transmission arrow signal is separated into an adaptive differential PCM signal, the adaptive differential PCM signal is code-converted, and information is output.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an example of an order wire device for implementing the present invention, and FIG. 2 is a diagram showing an example of a frame configuration of this order wire device.

The order wire device shown in FIG.
1, one line of the service data channel of the order wire system with a data transmission rate of 62 kb/s and voice signals are transmitted.

The audio signal a from the audio circuit (1) of this order wire device is P CM (Pulse Code Mod
ulation) is input to the code circuit (PCM C0D) 3. The PC, M code circuit 3 converts this audio signal into a PC
Convert it to M signal and send it to PCM/LINEAR conversion circuit (P
CM/LINEAR)7.

The PCM/L I NEAR conversion circuit 7 converts this PCM signal into linear PCM (No. 3) and outputs it to the adder 9 in order to perform linear addition. A linear PCM signal related to the line signal is input from the PCM/L I NEAR conversion circuit 11.The adder 9 adds these two linear PCM signals and converts the line signal to the L I NEAR/PCM conversion circuit (L I N
EAR/PCM) 13. LI NEAR/
The PCM conversion circuit 13 converts the added linear PCM signal into P
The signal is converted into a CM signal and output to an ADPCM (J hysteresis bone PCM) code circuit (ADPCM C0D) 17. A.D.
The PCM code circuit 17 converts the input PCM signal into 32k
It is converted into a b/S ADPCM signal C and output to the multiplex circuit 20.

In this way, when the audio signal a is output from the audio circuit 1, if another audio signal is output from the audio circuit 2, this audio signal a is output from the PCM code circuit 4. PC
It becomes a linear PCM signal via the M/LINEAR conversion circuit 8 and is input to the adder 10. An adder 10 adds this linear PCM signal and the linear pcM signal from the PCM/L I NEAR conversion circuit 12 to obtain a LINEAR/PCM signal.
It outputs to the PCM conversion circuit 14. L INEAR/P
The CM conversion circuit 14 converts this signal into a PCM signal and outputs it to the ADPCM code circuit 18. The ADPCM code circuit 18 converts the input PCM (No. 8 to 32 ktr/s
The ADPCM signal d is output to the multiplex circuit 20.

The multiplexing circuit 20 multiplexes the two 32 kb/s ADPCM signals C and d into a predetermined position of the 64 kb/s service data channel. An example of the frame structure at the time of multiplexing is shown in FIG.

As shown in FIG. 2, in a 32-bit frame 130 of a 54 kb/s service data channel 1.00, a 4-bit ADPCM signal section 111 is connected to an audio signal a.
A 4-bit ADPCM signal section 121 following the ADPCM signal section 111 is used for transmitting audio signals. Similarly, 4-bit ADPCM
The signal sections 112, 113, and 114 are for transmitting the audio signal a, and the 4-bit ADPCM signal section 122.12
3 is for transmitting audio signals, and these ADPCs
The M signal sections are arranged alternately. And ADPCM
Following the signal section 114, a 3-bit ADPCM signal section 12
4 is used for transmitting audio signals. Furthermore, multiplexing circuit 20 generates frame synchronization bits for a 64 kb/s service data channel and inserts these frame synchronization bits into frame 130 every 32 bits.

That is, a 1-bit frame synchronization section 125 that is a frame synchronization bit follows the ADPCM signal section 124.

In this way, the multiplex circuit 20 transmits the 32 kb/s ADPCM (, r) corresponding to the audio signal a, the 32 kb/s ADPCM signal d corresponding to the audio signal , through the branch circuit 21, 62kb/
s service data channel.

On the other hand, the transmission line signal from the 62 kb/s service data channel is sent to the separation circuit 19 via the branch circuit 21. A separation circuit 19 separates this transmission line signal into two sets of ADPCM signals e, each of which is an ADPCM signal.
It is output to decoding circuits (ADPCM DEC) 15 and 16. ADPCM decoding circuits 15 and 16 convert the ADPCM signal and convert the PCM signal into PCM/LINEA, respectively.
R conversion circuit 11.12 and PCM decoding circuit (PCM
DEC) 5.6. PCM/L INEAR conversion circuits 11.12 convert the PCM signals and output linear PCM signals to adders 9.10, respectively, as described above. Further, the PCM decoding circuits 5 and 6 receive the input PCM
The CM signal is converted and audio signals g and h are output to audio circuits 1 and 2, respectively.

In this way, according to this embodiment, the two sets of input signals to the order wire line are code-converted into 32 kb/s ADPCM signals, and the ADPCM signals are placed at predetermined positions in the conventional 54 kb/s frame format. Since two sets of ADPCM signals converted into
/s service data channel line can accommodate two independent order wire lines.

〔Effect of the invention〕

As explained above, the present invention converts the input signal to the order wire line into an ADPCM signal and transmits it to the existing service data channel. This has the advantage that the lines can be used as two independent lines.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of an order wire device for implementing the present invention, FIG. 2 is a diagram showing an example of a frame configuration of the device in FIG. 1, and FIG. 3 is a diagram showing an example of a conventional frame configuration. It is a figure showing an example. 1.2... Audio circuit (position) 3.4... PCM code circuit (PCM C0D) 5.6
-PCM decoding circuit (PCM DEC) 7, 8.11.
12...PCM/L INEAR conversion circuit (PCM/
L I NEAR) 9.10... Adders 13, 14... LINEAR/P'CM conversion circuit (L
INEAR/PCM) 15, 16... ADPCM decoding circuit (ADPCM DEC) 17, 18... ADPCM code circuit (ADPCM C0D) 19... Separation circuit 20... Multiplex circuit 21... Branch circuit

Claims (1)

[Claims] (1) An order wire line duplication system in which two order wire lines are accommodated in one data channel line, wherein the information input to each of the order wire lines is code-converted into an adaptive differential PCM signal, and each of the above-mentioned multiplexing the adaptive differential PCM signals at predetermined positions in the frame format of the data channel to generate a transmission line signal; transmitting the generated transmission line signal to one line of the data channel; A duplex system for order wire lines, characterized in that when a signal is received, the transmission path signal is separated into an adaptive differential PCM signal, the adaptive differential PCM signal is code-converted, and information is output.