SU1288923A1 - System for transmission and reception of digital information - Google Patents

Abstract

The invention relates to telecommunications and can be used to transmit two digital streams over a single linear path. The purpose of the invention is to increase throughput. The system contains on the transmitting side regenerators 1, serial-parallel converters 2, buffer registers 3, block 4 of generating equipment, address generator 5, storage unit 6, expander, encoder, group signal shaper, cyclic signal receivers 10, superframe clock receiver 11, shaper signal channels and a driver of service symbols, and on the receiving side - a regenerator, a decoder, a compander, a shaper of a group signal, a block of generating equipment, a transmitter atel signal channels, a serial-parallel converter, the timing of frame receiver multiframe timing generator and receiver overhead symbols. Two group streams come to the system inputs and from PCM in a quasitroic form. In the regenerators 1, a sync pattern of the type 0011011 and 0000 is searched, respectively, and signals are generated by which block 4 is established in temporal correspondence with PCM input streams 2 hp. f-ly, 5 ill. (p (L to CX) 00 with to oo

Description

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The invention relates to electrical engineering and can be used to transfer two synchronous digital streams of pulse code modulation (PCM) equipment over a single linear path. ,

The purpose of the invention is to increase throughput.

FIG. 1, 2 shows a block diagram of the transmitting side; FIG. 3 is a block diagram of the receiving side; FIG. 4 is a block diagram of a transmitter of a group signal of the transmitting side; FIG. figure 5 is a structural diagram of the generator group signal of the receiving side.

The system contains on the transmitting side regenerators 1, serial-parallel converters 2, buffer registers 3, block 4 of generator equipment, address generator 5, storage unit 6, expander 7, encoder 8, group signal generator 9, cyclical receivers 10, receivers 11 superframe clock, shaper 12 signal channels, shaper 13 service symbols, and on the receiving side - regenerator 14, decoder 15, compander 16, shaper 17 group signal, block 18 of generator equipment- 5 ani, shaper 19 signal channels, serial-parallel converter 20, receiver 21 cyclic sync signal, receiver 22 cyclic sync signal, shaper 23 service symbols. The group signal generator 9 consists of a generator of 24 cycles, a parallel-serial converter 25 and a linear signal generator 26, and a service symbol generator 23 consists of a cyclic generator 27, parallel-series converter 28 and a linear signal generator 29.

The system works as follows.

Two group streams of pulse code modulation (PCM) equipment in quasitroic form (PCM1 and PCM2) arrive at the system inputs. In the regenerators 1, the digital binary signal is restored and linked to the clock frequency of the master oscillator of the transmission generating equipment unit 4. The identified PCM information streams are then fed to the inputs of receivers 10 and 11 and serial-parallel converters 2. Cyclic-signal receivers 0 search for a synchronization pattern of the type 0011011 and generate a divider setting signal for 256 of the 4 block of generating equipment. The receiver 11 of the cyclic sync signal searches for a sync pattern of type 0000 and generates a divider setting signal for 16 block 4. Thus, the dividers of block 4 are set in temporary correspondence with the PCM input streams.

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In series-parallel converters, 2 PCM streams are converted to a parallel 8-bit code. On the buffer registers 3, the frequency is fixed at 256 kHz and the temporary unification of two PCM streams is performed by alternately switching on the buffer registers 3 in the first and second half of the byte, respectively, into a common eight-bit bus. The combined PCM streams arrive at the storage unit 6, in which the PCM streams temporarily align with each other. This is achieved by writing to the storage unit 6 at the address corresponding to the temporary position of the input PCM stream, and reading at the total address for both streams produced by the generator equipment unit 4. The write and read mode is controlled at 512 kHz. The address generator 5 organizes the total address write address and reads by combining the input address sequences of PCM streams 1 and 2 and the sequences generated by generating equipment block 4 to form an adaptive differential PCM output signal structure (ADPCM).

As a result of the compensation of time shifts in the output signal of the storage unit 6, the first half of each PCM system is located in the first half of each channel interval, and the second byte of the second system on the second half is located. The eight-digit non-linear PCM code is then converted to a linear thirteen-bit code in expander 7, from the outputs of which the linear PCM signal goes to the encoder 8. The encoder 8 digitally converts linear PCM codes using the adaptive differential PCM algorithm (ADPCM) to four-digit ADPCM, which are then fed to the shaper 9 group signal. The frequency grid formed by the generator equipment unit 4 provides the ADPCM algorithm operations for all 60 PCM channels (64 bytes) in the ADPCM output signal format. The imaging unit 9 converts the parallel ADPCM code into a serial code and introduces the service and signal symbols, as well as the conversion into a linear quasi-troc signal.

Thus, an output signal similar to the PCM signal is formed, in which instead of one information byte of PCM there are 2 four-bit words ADCM of the first and second PCM systems, respectively. The input of signal 5 information is provided by the shaper 12 of the signal transmission channels. The control signal, respectively, on the leading and trailing edge of the pulse allocates 0

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information from the signal channels of the first and second PCM system from the non-transformed stream at the output of the storage unit 6. The extracted signal symbols of the first and second PCM streams are converted into a stream of ADPCM so that one original sixteenth channel interval (CI) is filled.

The generator 9 is connected to the common bus by a control signal of all cycles except zero. Shaper 13 service symbols connect 9 symbols of the cyclic (0011011) and super-cyclic (0000) sync signals to the common bus of the generator in the zero even intervals of the even cycles and the sixteenth zero-cycle channels, respectively. In addition, shaper 9 provides the ability to transmit non-transformed "transparent PCM channels coming from the output of storage unit 6.,

At the receiving side, the ADPCM binary digital signal is recovered and a clock frequency of 2048 kHz is allocated by the Regulator 14. The ADPCM digital signal from the output of the regenerator 14 is fed to the inputs of cyclic and supercycle receivers 21 and 22 and serial-parallel converter 20. Receivers 21 and 22 similarly to the transmitting side, the search for sync combinations and the installation of dividers of the generating equipment unit 18 are carried out. In the converter, the 20-digital ADPCM stream is converted into a four-bit parallel code so that each word ADPCM takes up an interval equal to half a byte. The resulting four-bit code is fed to the inputs of the decoder 15, in which the inverse conversion of ADPCM codes into 12-bit PCM linear codes is carried out.

Conversion to the original 8-bit non-linear PCM code is carried out in compander 16. Received from the outputs of compander 16, the reconstructed eight-bit PCM signal, consisting of the combined PCM streams of the first and second systems, is fed to a group 17 receive signal generator, which is similar to 9, the service and signal symbols are entered into the PCM group streams, transformed into a serial code, and the formation of quasi-linear linear signals of PCM 1 and PCM 2.

The signal channels are inputted by the shaper 19 of the signal reception channels, which extract the symbols of the signal channels from the ADPCM stream and convert them to the original PCM signal format. Shaper 23 service characters enter the blue

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combinations in the PCM streams are similar to the former on the transmitting part.

Claims (3)

1. A digital information transmission and reception system comprising two regenerators on the transmitter side, the outputs of which are connected to the first and second installation inputs of the generator equipment unit through corresponding cyclic clock receivers, the first and second outputs of which are connected to the first inputs of the series-parallel converters, respectively; the inputs of which are combined with the second inputs of the receivers of the cyclic clock signal and the inputs of the regenerators and connected to the output of the clock frequency unit generator equipment, serially connected storage unit, expander, encoder and group signal generator, the third, fourth, fifth and sixth outputs of the generator equipment block are connected respectively to the control inputs of the memory block, encoder, group signal generator and output symbol service symbols, the outputs of which connected to the service inputs of the group signal generator, the outputs of the regenerators are connected to the third inputs of the series-parallel converters , the seventh output of the generator equipment unit is connected to the combined first inputs of the buffer registers, on the receiving side - serially connected regenerator, serially parallel converter, decoder, compander and group signal shaper, the output of the regenerator is connected to the first input of the frame sync signal receiver, the second input of which is combined with the second the input of the series-parallel converter and is connected to the output of the clock frequency of the generator equipment unit, the first input which is connected to the output of the cyclic sync signal receiver, the second input of the generator equipment unit is combined with the input of the regenerator, the first, second, third and fourth outputs of the generator equipment block are connected respectively to the control inputs of the series-parallel converter, decoder, group signal generator and service symbol driver, the outputs of which are connected to the service inputs of the group signal generator, characterized in that, in order to increase the bandwidth on the transmitting side, two cyclic signal receiver receivers, an address driver and a signal channel driver, the outputs of the regenerators connected to the first inputs, the reception of NIKOV cyclic signal signals, the second the inputs of which are combined and connected to the output of the clock frequency of the generator equipment unit, the outputs of the receivers of the superframe clock signal are connected to the corresponding inputs of the block of generator equipment, the eighth outputs of which are connected to the information inputs of the memory unit through the address generator, the outputs of the parallel-parallel converters memory block, the outputs of which are connected to the combined second input of the imaging group signal outputs and the outputs of which are connected to the third inputs of the group signal former, the ninth outputs of the generator equipment unit are connected to the second inputs of the signal channel former; on the receiving side, the cyclic signal receiver and the driver of the signal channels, and the regenerator output is connected to the first input of the receiver of a cyclic clock signal, the second input of which and the output are connected respectively to the output of the clock frequency and the third the input of the generator equipment unit, the fifth outputs of which are connected to the first inputs of the signal channel generator, the second inputs of which are combined with the second inputs of the group signal generator and connected to the outputs of the series-parallel converter, the third five the inputs of the group signal generator are connected to the output of the signal channel generator. 2. The system according to claim 1, wherein the group transmission shaper consists of a series-connected loop generator, a parallel-series converter and a line signal shaper, whose outputs are the outputs of the group signal generator, first, second, third, and fourth the fifth loop input cells are the first, second, third control and service inputs of the group signal generator, respectively; the fourth input of the cycle generator is combined with the second input House serializer. 3. The system according to claim 1, characterized in that the reception group signal generator consists of a series-connected cycle generator and a parallel-series converter, the outputs of which are connected to the inputs of the corresponding linear signal conditioners, first, second, third, fourth and fifth The shaper dusters are the first, second, and third control and service inputs of the shaper, respectively. group signal, the fourth input of the loop generator is combined with the second input of the parallel-serial converter. 0  /  / / N / / FIG. 2 u 77 V V / 21 I / Shaper of the group signal FIG. Figm  / 21 I l i 28 I 5