JPS62227240A - Line corresponding information coincidence system for adpcm transcoder - Google Patents

Abstract

PURPOSE:To make line corresponding information coincident by providing a line corresonding table in the inside of an ADPCM transcoder, inserting its address number in a line sending signaling information in an ADPCM DS1 and transmitting/receiving the number between opposed equipments. CONSTITUTION:Coding/decoding circuits 18,19 input the output of a format conversion circuit 17 corresponding to PCM line interface circuits 15,16, the coder side converts a PCM signal into an ADPCM signal and the decoder side converts the ADPCM signal into the PCM signal respectively. The format conversion circuit 17 applies mutual conversion between the frame constitution of each DSI signal and the frame constitution for internal signal processing between the PCM line interface circuits 15,16 and an ADPCM line interface circuit 20, applies the signal processing including the bundle processing and applies line asignment between a PCM DS1 signal and an ADPCM DSI signal. An address number of a line corresponding list is given to a line sending signaling information and alarm information in the ADPCM DS1 signal at the transmission side. Further, the reception side extracts the number and sends the result to a line corresponding information generating circuit 21.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention provides an ADPCM transcoder that can accommodate 24 lines of PCM signals with a transmission rate of 64 kbps.
When performing code conversion between the next group signal (hereinafter referred to as "rPCM DSL signal") and the first order group signal (hereinafter referred to as "rADPCM O81 signal") that can accommodate 48 lines of ADPCM signals with a transmission rate of 32 kbps. , relates to a line correspondence information matching method for ADPCM transcoders that matches line correspondence information indicating line correspondence.

Here, ADPCM is adaptive differential pulse code modulation (Ad
aptive differential pulse
code modu-1ation), which refers to a modulation method of an adaptive predictive coding method for audio waveforms.

〔overview〕

The present invention has two PCM 051 signals and eight DPCM O
In the ADPCMI-Lance coder that performs mutual code conversion with one 81 signal, the line correspondence table showing the line correspondence of each signal is shown in the ADPCMI above.
- Prepared in advance inside the Lancecoder, ADPCM
By inserting the address number from this line correspondence table into the delta channel that transmits signaling information and alarm information in the DSI signal, and sending and receiving this address number between opposing devices to match the line correspondence information, each signal is It is possible to match line compatibility information indicating line compatibility online and without using a dedicated line.

[Conventional technology]

Originally, ADPCM transcoder has a transmission speed of 64kbp.
This device improves line efficiency by converting the PCM signal of 100 kHz into an ADPCM signal with a transmission rate of 32 kbps, but the quality of digital data with a transmission rate of 64 kbps or 56 kbps or voice band data of 9600 bps or more is significantly degraded, so it cannot be transmitted. ADPC with speed 32kbps
For example, a PCM signal with a transmission rate of 64 kbps may be passed through without being converted into an M signal using two channels of the ADPC1'1 DSL signal.

Therefore, which line in the PCM 051 signal is an audio signal that can be transcoded into an ADPCM signal with a transmission rate of 32 kbps, which line is a voice band data signal with a transmission rate of 9600 bps or more, and which line is a voice band data signal whose transmission rate is 64 kI?
l) It is necessary to transmit information such as whether the data is ps or 56 kbps digital data and information indicating which line in the ADPCM 051 signal these lines are connected to to the opposite device.

Conventionally, line compatibility information was transmitted via a transmission medium separate from the original primary group signal, and was edited offline by an operator.

[Problem that the invention seeks to solve]

However, in this conventional line compatibility information matching method, a transmission medium separate from the primary group signal must be prepared, and the data is transmitted off-line and the operator performs correction/change operations. There was a problem that the burden on the staff was increasing.

The present invention solves these conventional problems,
Line compatibility information can be transmitted on the same ML line as the data signal,
Moreover, it is an object of the present invention to provide a line correspondence information matching method for ADPCM transcoders that can match line correspondence information online.

[Means for solving problems]

The present invention uses two PCM O5L signals and an ADPCM
An ADPCM transcoder that performs mutual code conversion with one DSI signal, and in a line correspondence information matching method that matches line correspondence information indicating the line correspondence of each of the above signals between opposing devices, it indicates the line correspondence of each of the above signals. Prepare the line correspondence table in advance inside the ADPCMI-Lancecoder,
The address number in the line correspondence table is inserted into the line that transmits the signaling information in the ADPCM O5L signal, and this address number is sent and received between the opposing devices to match the line correspondence information. .

[For production]

In the present invention, a line correspondence table containing line connection information between the PCM port S1 signal and the ADPCM port S1 signal is prepared in advance. The address numbers in this line correspondence table are inserted into the line (delta channel) that transmits signaling information and alarm information in ADPCM DSL signals, and the line correspondence information can be matched by sending and receiving between opposing devices. can.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram schematically showing an ADPCM transcoder using an embodiment of the present invention.

In the figure, reference number 11.12 is the PCM OSL signal input terminal, reference number 13.14 is the PCM O3L signal output terminal, reference number 31 is the ^DPCM DSL signal output terminal, and reference number 32 is the ADPCM DSL signal input terminal. be.

1” CM DSI signal input terminal 11 and PC gate DS1
A format conversion circuit (F) is connected to the signal output terminal 13 via a PCM line interface circuit (PCI) 15.
MT) 17 is connected to the PCM DSL signal input terminal 12 and PCMDS1 signal output terminal 14.
A format conversion circuit 17 is connected via a line interface circuit (PI, ■) 16. The format conversion circuit 17 includes a PCM line interface circuit 15.
．． 16, each encoder/decoder circuit (CO
D/DEC) 1B and 19 are connected. The format conversion circuit 17 is connected to an ADPCM O81 signal output terminal 31 and an Yakuha CMDSl signal input terminal 32 via an ADPCM line interface circuit (ALI) 20.

Further, a line correspondence information generation circuit (CIIrG) 21 is connected to the format conversion circuit 17.

PCM line interface circuit 15.16
This is a line interface portion that absorbs the time difference caused by the difference in frame structure between the DSI signal and the signal processed in the format conversion circuit 17, and also includes a function to detect an alarm.

The encoding/decoding circuits 18 and 19 input the output of the format conversion circuit 17, and the encoding side converts the PCM signal into AD.
On the decoding side, the ADPCM signal is code-converted into a PCM signal. However, the transmission speed is 32kb
Signals that are not code-converted into ps ADPCM signals bypass this encoding/decoding circuit 18 and 19.

The format conversion circuit 17 mutually converts the frame structure of each DSL signal and the internal signal processing frame structure between the PCM line interface circuits 15 and 16 and the ADPCM line interface circuit 20, and also Based on the output of the line correspondence information generating device 21, the PC
Line allocation is performed between the M DSL signal and the 1-Ko CM DSL signal.

Bundling processing is based on the American Standards Committee.
National 5standard Comm1tt
ee) published in the document “American Standardized 32kbps
"Revised Draft Proposal for ADPCM Algorithm and Line Format"
American National 5ta
ndard 32kbpsYakana CM Algo
rhythm and Line Format
”; TIYI/LB85-02 July 1
5.1985).

Further, on the transmitting side, the address number of the currently used line correspondence table is inserted into the line (delta channel) for transmitting signaling information and alarm information in the ADPCM DSI signal. Further, on the receiving side, the address number of the line correspondence table is extracted from the delta channel and sent to the line correspondence information generation circuit 21.

The ADPCM line interface circuit 20 is an ADPC
This is a line interface part that absorbs the time difference caused by the difference in frame structure between the MDSL signal and the signal processed in the format conversion circuit 17, and also includes a function to detect an alarm.

The line correspondence information generation circuit 21 includes the format conversion circuit 1
According to the address number of the line correspondence table output from 7, PCM O3
Each channel of one signal can be converted into a 32 kbps ADPCM code, or 64 kbps digital data, or 9600 bps
It is determined whether the signal is a voice band data signal or not. Based on this judgment, if the signal can be converted into a 32 kbps ADPCM code, one channel of the ADPCM DSI signal is made to correspond to it, and if the signal is any other signal, it is converted to ADPCM D.
Line correspondence information that associates two consecutive channels of SI signals is generated and sent back to the format conversion circuit 17.

Table 1 shows the PCM 051 signal and 80r'CM 051
This is an example of a line correspondence table showing line correspondence with signals. This line correspondence table is for A T & T Communicat.
Paper published by ions r BIT Compre
ssion Multiplexing J (198
This is shown in Figure 3 of September 2004). Here, the PCM signal is for 12 lines and is repeated for each bundle. If you use this line correspondence table and specify address number 1, one channel of PCM OSL signal will be 64kbp.
s digital data (64D), and it can be seen that channels 3 to 11 are audio signal data (32V) in the audio band that can be converted to a 32kbps PCM code. That is, channels 1 and 2 of bundle l of the CM 051 signal become channel 1 of the PCMDSL signal, and channels 3 to 11 become the PCM
Channel 3 corresponds to channel 11 of the O31 signal, and this information is sent to the line correspondence information generation circuit 21.

Table 2 is a table showing an example of a delta channel transmitted in an ADPCM DSI signal.

A1-A23.81-B23, C1-C23, Di-D
23 indicates signaling bits, M1 to M4 indicate alarm information bits, CRCI to CRC6 indicate cyclic code bits for bit error detection, and U1 to U24 are unused bits that are fixed to "1". and C
A1-CA4 are bits that transmit the address number of the line correspondence table.

In such a bit configuration, on the transmitting side of the format conversion circuit 17, CAL is set to "1", CA2, CA3
, CA4 are set to rOJ and output.

Also, on the receiving side, CA 1-CA in the delta channel
4 bits are extracted from the delta channel and output to the line correspondence information generation circuit 21.

Blank space below this page [Effects of the Invention] As explained above, the present invention provides line correspondence information to each DS.
1 signal line, there is no need to prepare a dedicated signal line for transmitting line-compatible information. Furthermore, since line correspondence information can be matched online between opposing devices, the burden on the operator can be reduced.

[Brief explanation of drawings]

The figure is a block diagram showing one embodiment of the present invention. 11.12...PCM DSL signal input terminal, 13.
14...PCMDSL signal output terminal, 15.16...
・PCM line interface circuit (r'LI), 1
7... Formant conversion circuit (FMT), 18.1
9... Encoding/decoding circuit (COD/DEC), 20
...ADPCM line interface circuit (ALI)
, 21... Line correspondence information generation circuit (CIIIG), 3
1...ADPCM-ro Sl signal output terminal, 32...A
DPCM O31 signal input terminal.

Claims (1)

[Claims] (1) Two primary group signals that can accommodate 24 lines of PCM signals with a transmission speed of 64 kbps, and one with a transmission speed of 32 kbps.
An ADPCM transcoder that performs mutual code conversion between the ADPCM signal of s and one of the primary group signals capable of accommodating 48 lines, line correspondence information that matches the line correspondence information indicating the line correspondence of each of the above signals between opposing devices. In the matching method, the line correspondence table showing the line correspondence of each signal above is
The address number in the line correspondence table is inserted into the line that is prepared in advance inside the M transcoder and transmits the signaling information in the primary group signal that can accommodate 48 lines of the ADPCM signal, and the address number is inserted between the opposing devices. A line correspondence information matching method for an ADPCM transcoder characterized by transmitting and receiving this address number to match line correspondence information.