JPH0630481B2 - Signaling transmission method - Google Patents

Description

The present invention relates to a signaling transmission system, and more particularly to a signaling transmission system in a 60-channel transcoder.

[Conventional technology]

Conventionally, this type of system has signaled to TS (time slot) 16 of ADPCM signal when the number of signaling bits per channel recommended by CCITT is 2 bits or less, and to TS16 and TS17 when it is 3 bits or more. It was a way to insert.

[Problems to be solved by the invention]

In the conventional signaling method described above, when the signaling for each channel is 3 bits or more, TS16 alone is 60
TS because the signaling area for the channel cannot be secured
It is necessary to use 17 as well, which inevitably reduces the number of ADPCM channels by 2. In addition, the signaling area is set to TS for 60-channel ADPCM.
If it is limited to 16, the signaling bit for each channel is limited to 2 bits or less, and in addition, the processing called Special processing specified in CCITT Recommendation G.761 has to be applied to the signaling bit to prevent multi-frame pseudo synchronization. However, this also has the drawback of being weak against bit errors.

The present invention is to provide a signaling transmission method that solves such a problem.

[Means for solving problems]

The present invention uses two n-channel PCM signals and one 2n
In a signaling scheme in a 2n-channel transcoder for converting a channel ADPCM signal, a transmitting side converts two n-channel PCM signals into one 2n-channel AD signal.
PCM-ADPCM conversion means for converting into a PCM signal, signaling extraction means for extracting signaling for each channel from the two n-channel PCM signals, and signaling for each channel extracted by the signaling extraction means one multiframe before Signaling change detection means for detecting the presence or absence of a difference from the same-channel signaling for each channel, and predetermined bits are assigned to each frame for each channel only when the signaling change detection means finds that the signaling has changed. Signaling insertion means for inserting changed signaling into an ADPCM channel time slot for transmitting voice, and transmitting to the opposite side whether or not there is a change in signaling found by the signaling change detecting means. Change signal generating means for generating a signaling change signal for each channel, and a signaling change for allocating the signaling change signal for each channel to a predetermined time slot of a signaling area secured when the signaling for each channel is 2 bits or less The signal insertion area allocating means and the signaling change signal inserting means for inserting the signaling change signal for each channel into the signaling change signal insertion area are provided, and the receiving side receives one 2n channel ADPCM signal and two n channel PCM. ADPCM-PCM conversion means for converting the signal into a signal, and a signaling change signal for monitoring the signaling change signal included in the predetermined time slot of the 2n-channel ADPCM signal to determine the presence or absence of signaling changed for each channel. Monitoring means, signaling extraction means for extracting the signaling from the ADPCM channel time slot corresponding to the channel in which the signaling changes by the signaling change signal monitoring means, and the signaling by the presence or absence of the signaling change by the signaling change signal monitoring means Signaling forming means for selecting, for each channel, either the changed signaling extracted by the extracting means or the signaling that has been continued until now, and adjusting the signaling of each channel to the n-channel PCM signaling format, and the signaling forming means And a signaling insertion means for inserting the specified signaling into the predetermined time slots of the two n-channel PCM signals, and the signaling of the 2n-channel is performed for each ADPCM. It is characterized by transmitting only when signaling at catcher channel time slot is changed.

〔Example〕

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

1 and 2 show an embodiment of the present invention. FIG. 1 shows a transmitting side and FIG. 2 shows a receiving side. In this example, 2
This is a signaling transmission system in a 60-channel transcoder that converts one 30-channel 2048 kbit / s PCM signal and one 60-channel 2048 kbit / s ADPCM signal.

In the present embodiment, on the transmitting side of FIG. 1, PCM codes for 60 channels from the PCM signal input terminal 1 are PCM-AD.
It is input to the PCM conversion circuit 2. The conversion circuit 2 converts the PCM code for 60 channels into an ADPCM code and sends it to the signaling insertion circuit 5.

The PCM code for 60 channels is also input to the signaling extraction circuit 3, and the extraction circuit 3 outputs 60 PCM signals in the PCM signal.
The signaling for the channel is extracted. The extracted signaling is sent to the signaling insertion circuit 5 and the signaling change detection circuit 4. Signaling change detection circuit 4
Then, the extracted signaling is monitored to determine whether or not there is a difference from the signaling of the same channel one multiframe before. The determination result is sent to the signaling insertion circuit 5 and the signaling change signal generation circuit 6.

The signaling insertion circuit 5 inserts the changed signaling into the ADPCM channel time slot for transmitting the voice allocated by 4 bits per frame only in the channel in which the signaling change detection circuit 4 has found that the signaling has changed. And sends it to the signaling change signal insertion circuit 7. On the other hand, the signaling change signal generation circuit 6 generates a signaling change signal for each channel for transmitting to the opposite side whether or not there is a change in signaling found by the signaling change detection circuit 4,
It is sent to the signaling change signal insertion circuit 7. In the signaling change signal insertion circuit 7, T in the conventional signaling area is used.
The signaling change signal from the signaling change signal generation circuit 6 is inserted into the signaling change signal insertion area consisting of a maximum of 2 bits for each channel assigned to S16.

As described above, the 60-channel ADPCM signal output terminal 8 outputs the 60-channel ADPCM signal including signaling only when the signal changes for each channel and is sent to the receiving side.

On the receiving side in FIG. 2, 60-channel ADPC from the transmitting side
The M signal is sent to the ADPCM-PCM conversion circuit 10, the signaling change signal detection circuit 11 and the signaling extraction circuit 12 via the input terminal 9.

In the ADPCM-PCM conversion circuit 10, 60 channels of A
Convert DPCM code to PCM code. PCM obtained
The signal is sent to the signaling insertion circuit 14.

On the other hand, in the signaling change signal detection circuit 11, the ADPC
The signaling for each channel assigned to the TS 16 of the M signal is monitored to determine the presence / absence of signaling that has changed for each channel. The determination result is sent to the signaling extraction circuit 12 and the signaling formation circuit 13.

The signaling extraction circuit 12 extracts the signaling from the ADPCM channel time slot corresponding to the channel in which the signaling changes, and the signaling formation circuit
Send to 13.

In the signaling formation circuit, the signaling change signal detection circuit 11 determines whether or not there is a signaling change, and when the signaling change is present, the changed signaling extracted by the signaling extraction circuit 12 is continued. One of the existing signaling is selected for each channel, the signaling of each channel is arranged in the signaling format of a 30-channel PCM signal, and the signal is sent to the signaling insertion circuit 14.

In the signaling insertion circuit 14, the signaling formation circuit 13
The signaling obtained in (1) is inserted into TS16 of the two 30-channel PCM signals and output from the two 30-channel PCM signal output terminals 15.

Next, in order to deepen the understanding of the present invention, description will be given using Tables 1 and 2. Table 1 shows a frame structure of a 60-channel ADPCM signal. 30 8-bit time slots except TS0 and TS16 are divided into 4 bits and are allocated to 60 ADPCM channel time slots. Conventionally, the signaling bit of 2 bits or less is assigned to each TS16 for each channel, but in the present invention, the signaling change signal is assigned to this.

Table 2 shows an example of signaling change signal allocation. That is, when the signaling of a certain channel included in the two 30-channel PCM signals changes on the transmitting side, the changed signaling is inserted in the corresponding ADPCM channel time slot of Table 1 and at the same time, the corresponding channel of the signaling change signal allocation of Table 2 is inserted. Information with a signaling change is inserted in the area. On the receiving side to which this ADPCM signal is sent, when the signaling change signal in Table 2 is detected and the information with the signaling change is detected, the corresponding ADPCM signal is detected.
The signaling is restored by extracting the signaling from the channel time slot, converting the changed signaling into the signaling that has been continuing until now, and inserting it into two 30-channel PCM signals.

EFFECTS OF THE INVENTION As described above, according to the present invention, the signaling is 4-bit ADP only when the signaling changes for each channel.
By transmitting using the CM channel time slot and at the same time transmitting the signal indicating the presence or absence of signaling change using the TS16, it is possible to process regardless of the number of signaling bits for each channel, and without reducing the number of channels. In addition, multi-frame pseudo synchronization can be prevented by appropriately determining the signal indicating the presence or absence of signaling change, and further, there is an advantage that it is resistant to bit errors because no special processing is required for signaling.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a diagram showing a transmitting side and FIG. 2 is a diagram showing a receiving side. 1 ... Two 30-channel PCM signal input terminals 2 ... PCM-ADPCM conversion circuit 3 ... Signaling extraction circuit 4 ... Signaling change detection circuit 5 ... Signaling insertion circuit 6 ... Signaling change signal generation circuit 7 ... Signaling Change signal insertion circuit 8 …… 60 channel ADPCM signal output terminal 9 …… 60 channel ADPCM signal input terminal 10 …… ADPCM-PCM conversion circuit 11 …… Signaling change signal detection circuit 12 …… Signaling extraction circuit 13 …… Signaling formation circuit 14 …… Signaling insertion circuit 15 …… Two 30-channel PCM signal output terminals

Claims (1)

[Claims] 1. Two n-channel PCM signals and one two
In a signaling method in a 2n-channel transcoder for converting an n-channel ADPCM signal, the transmitting side converts two n-channel PCM signals into one 2n-channel AD signal.
PCM-ADPCM conversion means for converting into a PCM signal, signaling extraction means for extracting signaling for each channel from the two n-channel PCM signals, and signaling for each channel extracted by the signaling extraction means one multiframe before Signaling change detection means for detecting the presence or absence of a difference from the same-channel signaling for each channel, and predetermined bits are assigned to each frame for each channel only when the signaling change detection means finds that the signaling has changed. Signaling insertion means for inserting the changed signaling into the ADPCM channel time slot for transmitting voice, and the presence / absence of signaling change found by the signaling change detection means are transmitted to the opposite side. Change signal generating means for generating a signaling change signal for each channel, and a signaling change for allocating the signaling change signal for each channel to a predetermined time slot of a signaling area secured when the signaling for each channel is 2 bits or less A signal insertion area allocating means and a signaling change signal inserting means for inserting the signaling change signal for each channel into the signaling change signal insertion area are provided, and the receiving side is provided with one 2n channel ADPCM signal and two n channel PCM. ADPCM-PCM conversion means for converting the signal into a signal, and a signaling change signal for monitoring the signaling change signal included in the predetermined time slot of the 2n-channel ADPCM signal to determine the presence or absence of signaling changed for each channel Viewing means, signaling extraction means for extracting signaling from an ADPCM channel time slot corresponding to a channel having a signaling change by the signaling change signal monitoring means, and the signaling by the presence or absence of signaling change by the signaling change signal monitoring means Signaling forming means for selecting, for each channel, either the changed signaling extracted by the extracting means or the signaling that has been continued until now, and adjusting the signaling of each channel to the n-channel PCM signaling format, and the signaling forming means And a signaling inserting means for inserting the specified signaling into the predetermined time slots of two n-channel PCM signals, and the 2n-channel signaling is provided in each ADPCM channel. Signaling transport in 2n channel transcoder, characterized in that the transmission only when the signaling in-time slot has changed.