SU1665521A1 - Pulse-code-modulator data transmission and reception system with multiuser channel groups assignment - Google Patents

Abstract

The invention relates to telecommunications and can be used in digital communication systems. The purpose of the invention is to improve the noise immunity to the disturbance of phasing of information signals. The system for transmitting and receiving information with pulse-code modulation and the allocation of multiple-use channel groups contains a transmission node containing a component 1 digital component transmitting unit 1, a multiplexing unit 2, an intermediate node containing a regenerator 4, a key 5, an OR element 6, a sync receiver 7 , Element 9, receiving interface block 10, consisting of a generator 11, memory block 12 and phase locked loop 13, a transmission interface block 14 consisting of a code converter 15 and memory block 16, and node 18 receiving but. The goal is achieved by introducing a digital flux alignment unit into the transmission node, and channel signal converters 17 are inserted into the intermediate node. 2 hp f-ly, 3 ill.

Description

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The system for transmitting and receiving information with pulse-code modulation and the allocation of multiple-use channel groups contains a transmission node containing a component digital stream transmission block 1, a multiplex bpoc 2, an intermediate node containing a regenerator 4, a key 5, an OR element 6, a sync receiver 7 , Element 9, interface block 10 The invention relates to telecommunications and can be used in digital communication systems, including process communication systems,

The aim of the invention is to increase the noise immunity to phasing violation of information signals.

Figure 1 shows a structural electrical circuit of a system for transmitting and receiving information with pulse-code modulation and the allocation of multiple-use channel groups; Fig. 2 is a structural electrical circuit of a digital stream alignment unit; FIG. 3 shows a structural electrical circuit of a converter of channel signals.

The system contains a transmission node containing a component 1 digital component transmission block 1, a multiplex unit 2 and a digital stream alignment block 3, an intermediate node containing a regenerator 4, a key 5, an OR element 6, a clock signal receiver 7, an AND 9 element, a receive interface block 10 consisting of a driver 11, a memory block 12 and a phase locked loop 13, a transmission interface block 14 consisting of a code converter 15 and a memory block 16, channel converters 17 and a receiving node 18, the digital stream alignment block 3 IT regenerator 19, clock signal generator 20, clock pulse generator 21, reception interface block 22, transmission interface block 23, clock receiver 24, key 25, AND element 26, OR element 27. The channel signal converter 17 contains decoder 28, encoder 29, the first 30 and second 31 switches, the first 32 and second 33 low-pass filters, the differential amplifier 34, the sampling and storage unit 35, the modulator 36, the amplifier 37.

The system of transmitting and receiving information with pulse-code modulation and the allocation of groups of channels of collective use works as follows.

Component digital stream from the output of block 1 is fed to one of the inputs

A memory unit consisting of a driver 11, a memory unit 12 and a phase locked loop unit 13, a transmission interface unit 14 consisting of a code converter 15 and a memory unit 16, and a reception unit 18. The goal is achieved by introducing a digital flux alignment unit into the transmission node, and channel signal converters 17 are inserted into the intermediate node. 2 hp f-ly, 3 ill.

unit 2, where it is combined with other component streams into an aggregate digital stream. The specified association of component streams is asynchronous.

From the output of block 2, the aggregate digital stream enters the input of block 3, where it is converted. The transformation is reduced to the alignment of the beginning of the cycle of the indicated component stream with the beginning of the cycle of the aggregate stream. From the output of block 3, the aggregate digital flow and the linear code goes through the communication line to the first input of the regenerator 4. Amplified and reconstructed aggregate digital

the stream from the output of the regenerator 4 in binary code goes to the second input of the receiver 7, the key 5 and through the element AND 9 to the input of the generator 11 of the block 10. At the same time, not the first input of the generator 11 receives

pulse sequences from the first output of the generator 8, providing joint operation with the receiver 7 of the driver 11, which provides the opening of the element And 9 with the subsequent selection

component stream from the aggregate and its recovery in block 12.

The component digital stream is recorded in block 12 by an unrestored recording clock frequency from the output

the generator 11, and the readout is the recovered clock frequency from the output of block 13. From the output of block 12, the component signal in binary code goes to the information input of the converter 17. Input of the component stream from the output of the converter 17 into the modular one is carried out sequentially by the converter 15 of block 14, the element OR 6 and through the second input by the regenerator 4, then from the first

the output of the regenerator 4 aggregate digital stream in the linear code is transmitted through the communication line and the node 18

Transfer of component digital stream from converter output 17 to input

block 14 is made along the codirectional junction, t, nd. simultaneously with the component stream information signal with

the output of the converter 17 is transmitted to the recovered frequency signal. Converter 15 provides, at its output, the conversion of a component digital stream from a serial to a parallel binary code, the formation of recording signals, according to which information signals are recorded in block 16.

Block 3 works as follows. The aggregate digital stream in the linear code goes to the first input of the regenerator 19 and from its output to the receiver 24, the key 25, the element AND 26 and the element OR 27, whose operation is similar to the joint operation of the regenerator 4, the receiver 7, the key 5, the element OR 6 and the element And 9. At the same time, the pulse sequences of the installation and the clock frequency of the aggregate digital flow produced by the regenerator 19 ensure synchronous operation of the generator 20. The unrestored component digital flow from the output of the regenerator 19 is fed to the input of the unit 22, operating under the influence of the control pulse sequence generator 20. The isolated and reduced component digital stream from the second output of block 22 is supplied directly to the second block 23 to BHOD sonaprazlennomu joint.

The Converter 17 operates as follows. The recovered component digital stream through the fourth run of converter 17 is fed to the input of decoder 28, which also receives the clock frequency of the component digital stream and the pulse control sequence of the decoder 28 generated by generator 8. The decoding of the component digital stream results in a pulse train of pulse amplitude modulation { AIM) at the output of the decoder 28, which, after appropriate gating on the first switch 30, is fed to the input of the first filter 32. The effect of the latter on the sequence of PIM pulses leads to the transformation of the latter into a tone frequency signal. The sequence of PIM pulses from the output of the decoder 28 is fed to the input of the differential amplifier 34. The PIM pulses are pre-built by the second switch 31.

The amplitude-amplified PIM sequence from the output of the differential amplifier 34 is fed to the second input of the encoder 29, where it is encoded in the clock frequency of the component signal. The result of encoding a PAM signal is a sequence of code groups characterized by a given

the duration of the code group and its position relative to the cyclic clock signal

0 component digital stream. The local station’s tonal frequency signals of the intermediate station are transmitted using the first input of the differential amplifier 34. In this case, the signals are filtered by the second filter 33 and amplified to the nominal level of the amplifier 37, after which they are amplitude-modulated in the modulator 36. A sample of the amplitude of the pulse from the output of the modulator 36 and its storage for the encoding time by encoder 29 is provided by block 35.

Claims (3)

1. An information transmission and reception system with pulse-code modulation and allocation of multiple-use channel groups, comprising a serially connected transmission node, an intermediate node and a receiving node, the transmitting node containing a grouping unit and a component digital component transmitting unit connected to one of its inputs. flow, and the intermediate node contains a regenerator, the first input and the first output of which 5 are respectively an input and an output of an intermediate link, a key connected in series and an element of the PI, the output of which is connected to the second input of the regenerator, the receiver of clock signals, the output 0 which is connected to the first clock signal generator input, the second input of which is combined with the first sync signal receiver input and connected to the second output of the regenerator, the third output of which is under5 keys to the second input of the sync signal receiver, the first input of the And element and the first input of the key, the second input of which combined with the second input of the And element, the synchronizing inputs of the receiving interface unit and the transmission interface unit and connected to the first output of the sync signal generator, and the output of the transmission interface unit chen to the second input of the OR gate, wherein TZM that 5 in order to improve noise immunity to the disturbance of phasing of transmitted information signals, a digital flow equalization block was inserted into the transmitting unit, connected between the output of the dead-life block and the output of the transmitting node, another output of the digital alignment block connected to the component digital streams of the transmitting block, and intermediate the node introduced converters of channel signals, the first inputs of which are combined and connected to the second output of the clock signal generator, the third output of which connected to the combined second inputs of converters of channel signals, the third inputs of which are combined and connected to the first output of the receive interface unit, the second output of which is connected to the combined fourth inputs of converters of channel signals, the fifth inputs of which are combined and connected to the fourth output of the sync signal generator, and the third the output of the reception interface block is connected to the first input of the transmission interface block, the second input of which is connected to the combined outputs of the channel converters signals. 2. The system according to claim 1, characterized in that the digital flux alignment unit contains a regenerator, the input and output of which are respectively the input and outputs of the digital flux alignment unit, the other output of which is the output of the clock signal generator, the input of which is connected to the first output clock generator, the first input of which is combined with the first clock receiver input, the third output of which is connected to the combined second clock receiver input and the first inputs of the key and the And element, the other one d which is combined with a second input key, and a clock input receiving unit interface and the transmission interface unit and connected to the second output R the clock signal generator, the second input of which is connected to the output of the clock signal receiver, the output of the AND element is connected to the input of the receiving interface, the first and The second outputs of which are connected to the same inputs of the transmission interface block, the output of which is connected to the input of the OR element connected between the output of the key and the second input of the regenerator. 3. The system of claim 1, wherein the channel signal converter comprises a serially connected decoder, a first switch and a low-pass filter, the second low-pass filter connected in series, an amplifier, a modulator, a sampling unit and storage, a differential amplifier and an encoder, the output of which is the output of a channel signal converter, the first input of which is the first input of a decoder, and the second input of a channel signal converter is the combined synchronous inputs of the first and second switches, the first inputs of which are combined, the output of the second switch is connected to the second input of the differential amplifier, the combined second inputs of the encoder and decoder are the third input of the channel signal converter, the fourth input of which is the third input of the decoder, and the fifth input of the converter of channel signals are the combined synchronous inputs of the encoder and the modulator. G2 H 3 T You move th I-t-I I TV input 3