JPH03181239A - Tandem connection system for pcm channel - Google Patents

Abstract

PURPOSE:To reduce the deterioration of the reproduced voices by providing a channel interface CHINF circuit, a speed conversion circuit, a decoding DE CODE circuit, and a coding CODE circuit. CONSTITUTION:A CHIHF 31 receives the reception data 41 separated for each channel from a separate multiplexing device 2a (2b) and writes the data 41 in an FIFOM 33. A read clock 39 of the FIFOM 33 is given from the CHINF 31 synchronously with an intra-office clock supplying device 1, and the data 41 is converted into the speed of the clock 39 received from the CHINF 31. The output data 40 on the FIFOM 33 is inputted to a CODE 35, and the CODE 35 converts the received data 40 into a bipolar signal which is sent to a PCM tandem connection device 3. The bipolar signal received from the device 3 performs the bipolar violation monitoring and the bipolar/unipolar conversion via a DECODE 34.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a PCM channel tandem connection system for a PCM code communication system.

[Conventional technology]

In the conventional PCM channel tandem connection method, the transmitting side performs PCM-voice conversion and the extraction of signaling information, and the receiving side connects the voice and performs the voice-PCM conversion again and inserts the signaling information. was.

[Problem to be solved by the invention]

In the conventional PCM channel tandem connection method described above,
The transmitting side performs PCM-voice conversion and extracts signaling information, and the receiving side connects the voice and converts the voice-PCM again.
Since it is a tandem connection method that converts PCM-voice and inserts signaling information, PCM-voice and voice-P
There is a drawback that the audio quality deteriorates significantly due to CM conversion.

[Means to solve the problem]

The PCM channel tandem connection system of the present invention includes a channel interface circuit that interfaces with a demultiplexer and receives clock supply, a speed conversion circuit that converts the speed of transmitting side data and receiving side data, and transmitting side data in bipolar format. a decoding circuit that extracts transmission signaling information from a violation code using a violation code and converts the bipolar signal into a unipolar signal; and a code circuit that converts the receiving side data into a bipolar signal and adds reception signaling information when a bipolar violation occurs. ing.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a block diagram showing an example of the PCM tandem connection device in Fig. 1, and Fig. 3 is a fast-in-fast receiving side diagram in Fig. 2. A diagram showing the relationship between the input/output data of the out memory and the clock, Figure 4 is a diagram showing an example of bipolar violation occurrence on the receiving side, and Figure 5 is a signaling extraction of the PCM tandem connection device in Figure 2. Figure 6 showing an example of
This figure is a diagram showing the relationship between input/output data and clocks of the fast-in-fast-out memory on the transmitting side in FIG. 2.

In FIG. 1, in this embodiment, a PCM tandem connection device 3 faces each other and transmits and receives data, and a clock is supplied to this PCM tandem connection device 3 to separate and multiplex 30 channels of 64Kbps data. The demultiplexing and multiplexing devices 2a and 2b and the demultiplexing and multiplexing device 2a
, 2b, and an internal clock supply device 1 for supplying an internal clock to the internal clocks.

In FIG. 2, the PCM tandem connection device 3 in FIG. A fast-in-fast-out memory (hereinafter referred to as FIFOM) 32 that performs speed conversion of data on the receiving side, a FIFOM 3B that performs speed conversion of data on the receiving side, and a fast-in-fast-out memory (hereinafter referred to as FIFOM) that performs speed conversion of the data on the receiving side, and extracts transmission sidner ring information from the sending side data in bipolar format using a violation code. A decoder circuit (hereinafter referred to as DEC) that converts a bipolar input signal into a unipolar signal
(hereinafter referred to as C0DE) 34, and a code circuit (hereinafter referred to as C0DE) 3 that converts receiving side data into a bipolar signal and adds reception side ringing information when a violation occurs.
5 at the bottom of the tank.

Next, the operation of the PCM tandem connection device shown in FIG. 2 will be explained.

First, FIGS. 1 and 2 show the operation of the receiving side.

This will be explained using FIGS. 3 and 4.

The CHIHF 31 receives received data 41 separated into channels from the demultiplexer 2a (or 2b), and
Write to FOMB. The readout clock 39 of the FIFOM 33 is given from the CHINF 31 to the internal clock supply device 1 in synchronization, and the received data 41 is sent to the CHINF
The read clock from 31 is converted to 3 speeds. In addition, the input/output data of FI FOM33 is 41.40
The relationship between the internal clock 39 and the internal clock 39 is shown in FIG.

The output data 40 of the FIFOM33 is input to the C0DE35. The C0DE 35 converts the receiving side data 40 into a bipolar signal and sends it to the opposing PCM tandem connection device 3 shown in FIG.

At this time, it is necessary to insert reception synchronization information, which is added by bipolar violation in this embodiment. That is, the received signaling signal 42
Any one of the bits is violated and signaling on/off is displayed with or without violation. Incidentally, an example of occurrence of bipolar violation is shown in FIG.

Next, regarding the operation on the transmitting side, FIGS. 1 and 2.

This will be explained using FIGS. 5 and 6.

A bipolar signal from the opposing PCM tandem connection device 3 shown in FIG. 1 is input to the DECODE 34. D.E.
CODE34 performs bipolar violation monitoring and bipolar/unipolar conversion. The 8-bit data of one time slot is synchronized with the internal 8kHz clock, and by monitoring the bipolar violation of the transmitting side data, it extracts transmission synchronization information. A transmission signaling signal 43 is sent to CHINF31.

Incidentally, an example of signaling extraction is shown in FIG.

DECODE 34 performs bipolar/unipolar conversion and writes transmit data 36 to FI FOM 32. CH
The INF 31 reads the transmitting side data from the FIFOM 32 at the speed of the transmission clock 8 of the demultiplexer 2a. Incidentally, the relationship between the input/output data of the FIFOM 32 and the tarok is shown in FIG.

The CHINF 31 inserts signaling information in accordance with the signaling pulse from the demultiplexer 2a and sends it to the demultiplexer 2a.

〔Effect of the invention〕

As explained above, the present invention includes a channel interface circuit that interfaces with a demultiplexer and receives clock supply, a speed conversion circuit that converts the speed of transmitting data and receiving data, and converts bipolar format transmitting data to PCM has a decoding circuit that extracts transmission signaling information using a ration code and converts a bipolar signal into a unipolar signal, and a code circuit that converts receiving side data into a bipolar signal and adds reception signaling information when a bipolar violation occurs. Since it is possible to perform tandem connections for signaling and audio without converting signals to audio, it has the effect of reducing the deterioration of reproduced audio that is a problem with conventional tandem connection methods.
Furthermore, there is no special additional connection part in the conventional tandem connection method, which has the effect of simplifying installation.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a block diagram showing an example of the PCM tandem connection device in Fig. 1, and Fig. 3 is a fast-in-fast receiving side diagram in Fig. 2. A diagram showing the relationship between out-memory input/output data and tarokku, Figure 4 is a diagram showing an example of occurrence of bipolar violation on the receiving side, and Figure 5 is a signaling extraction of the PCM tandem connection device in Figure 2. Figure 6 showing an example of
This figure is a diagram showing the relationship between input/output data and clocks of the fast-in-fast-out memory on the transmitting side in FIG. 2.

Claims (1)

[Claims] A channel interface circuit that interfaces with the demultiplexer and receives clock supply, a speed conversion circuit that converts the speed of transmitting side data and receiving side data, and extracting transmission signaling information from the transmitting side data in bipolar format using a violation code. a decoding circuit that converts bipolar signals into unipolar signals;
A PCM channel tandem connection system characterized by comprising a code circuit that converts the receiving side data into a bipolar signal and adds reception signaling information when a bipolar violation occurs.