SU1100750A1 - Conferenece connection device for system with pulse-code modulation - Google Patents

Abstract

1. DEVICE CONFERENCE CONNECTION IN SYSTEMS WITH PULSE CODE MODULATION (PCM); containing input and output registers, serially connected memory block and buffer register, the output register input connected to the memory block input, characterized in that, in order to improve the quality of the conference connection, signals, the input of the group PCM signal of the first subscriber of the PCM combining unit is connected to the output of the memory unit, the input of the group PCM signal of the second subscriber of the PCM combining unit is connected to the output buffer register, the input of the channel interval which is connected to the input of the channel interval of the PCM combining unit, the output of which is connected to the input of the output register, the fourth input of the combining unit, the PCM signals is the input of an odd-cycle, the fifth input of the combining unit (the PCM signal is the input of an even cycle.

Description

2. The apparatus of claim 1, wherein the PCM signal combining unit contains five AND elements, two OR elements, two inverters, and two digital speech detectors, the first inputs of the first and second AND elements being inputs odd and even cycles, respectively, the second inputs of the first and second elements And are connected to the first inputs of the respective speech detectors and are the inputs of the group PCM signal of the first and second subscribers, respectively, the second inputs of the digital speech detectors are combined and connected to rvymi, inputs of the third, fourth and fifth AND gates and are the input slot, the output of the first digital speech a detector coupled to a second input of the fourth AND gate and via a first inverter to the second input of the fifth AND gate, the third. the input of which is connected to the first input of the second digital speech detector, the output of which is connected to the fourth input of the fifth AND element, the third input of the fourth AND element, and through the second inverter to the second input of the third AND element, the output of which is connected to the first input of the first OR element, the second and the inputs of which are connected to the outputs of the fourth and fifth elements And, respectively, the third input of the third element And is connected to the second input of the first element And, the input of which is connected to the first input of the second element OR, the second input otorrhea connected to the output of the second AND gate, the output of the second OR gate coupled to a fourth input of the fourth element I.

3. The device according to claim 2, wherein the digital speech detector contains two elements, an RS, a trigger, a serially connected binary counter and a binary code decoder, the first input of the first element I being the input of a group PCM the signal, the second input is the input of the channel interval, the third input is the input of the code word of the PCM signal, the output of the first element I is connected to the input of the S RS trigger and the first input of the binary counter to zero, the second input of the binary counter is connected to the output of the second er The element I, the first input of which is connected to the output of the RS flip-flop, the input R of which is connected to the output of the binary code decoder, the second input of the second element I is the input of frame synchronization.

The invention relates to digital telecommunications, in particular to systems with a pulse code modulation (PCM) and time division multiplexing, and can be used in conference communication devices on electronic PBXs with digital circuit switching.

A conference call device is known that contains shift registers, code converters, and a totalizer ij.

However, this device is difficult and does not have sufficient reliability.

The closest to the present invention is a conference communication device in systems with pulse-code modulation, containing input and output registers, serially connected memory block and buffer register, the output of the input register connected to the input of memory block 2.

However, the known device obladl low quality conferencing.

The purpose of the invention is to improve the quality of the conference.

This goal is triggered by the fact that in a conference call device in systems with pulse code modulation, containing input and output registers, serially connected memory block and buffer register, the output of the input register connected to the memory block input, a block is entered combining the PCM signals, the input of the group PCM signal of the first subscriber of the PCM signal combining unit connected to the memory block input, the input of the group PCM signal of the second subscriber of the PCM combining unit connected to the output of the buffer register, The channel interval input of which is connected to the channel interval input of the PCM combining unit, the output of which is connected to the output register input, the fourth input of the PCM signal combining unit to the odd-cycle input (NC fifth input of the IC-combining unit of the even-cycle (QC). In this case, the ICMsignal merge block contains five AND elements, two OR elements, two inverters, and two digital speech detectors (CRS), with the first inputs of the first and second AND elements being odd and even respectively, the second inputs of the first and second elements I are connected to the first inputs of the respective speech detectors and are the inputs of the group PCM signal of the first and second subscribers, respectively, the second inputs of the digital speech detector are combined and connected to the first inputs of the third, fourth and fifth And elements are the input of the channel interval, the output of the first digital speech detector is connected to the second input of the fourth element And through the first inverter to the second inputs of the fifth element And, the third input which is connected to the first input of the second digital speech detector, the output of which is connected to the fourth input of the fifth And element, the third input of the fourth And element, and through the second inverter to the second input of the third And element, the output of which is connected to the first input of the first OR element, second and the third inputs of which are connected to the outputs of the fourth and fifth elements of AND; respectively, the third input of the third element AND is connected to the second input of the first element AND, the output of which is connected to the first input of the second element OR, the second D of which is connected to the output of the second element AND, the output of the second element OR is connected to the fourth input of the fourth element I. In addition, the digital speech detector contains two elements AND, Yab-trigger, serially connected binary counter and a binary code decoder, with the first input of the first element And is the input of a group PCM signal, the second input is the input of the channel interval, the third input is the input, the PCM-code codeword discharge, the output of the first element I is connected to the S input of the RS flip-flop and the first binary input reset In the zero counter, the second input of the binary counter is connected to the output of the second And element, the first input of which is connected to the output of the RS flip-flop, the input R of which is connected to the output of the binary code decoder, the second input of the second And element is an input of frame synchronization. FIG. Figure 1 shows the electrical circuit diagram of a conference device in systems with pulse code modulation; in fig. 2 is a structural electrical circuit of the PCM-signal combining unit; in fig. 3 is a structural electrical circuit of a digital speech detector. The conferencing device in systems with pulse-code modulation contains an input register 1, an output register 2, a memory block 3, a buffer register 4, and a PCM combining block 5. The PCM combining unit 5 contains the first digital speech detector b, the second digital speech detector 7, the first element AND 8, the second element AND 9, the third element AND 10, the fourth element AND 11, the fifth element And 12, the first element OR 13 , the second element OR 14, the first inverter 15 and the second inverter 16. The digital speech detectors b and 7 contain the first element 17, the second element 18 and 18, the RS flip-flop 19, the binary counter 20 and the decoder 21 binary code. The conference device in systems with pulse-code modulation operates as follows. The PCM signals of the first and second subscribers are supplied to the device synchronously. Depending on the values of the logical signals generated by the digital speech detectors, the combination of the circuit consisting of the fourth element And 11 and the fifth element And 12 may be in one of the three STATES. The transmission is conducted by the first subscriber, the second subscriber is listening. At the output of the first POR, an optical 1 appears, and at the output of the second POR, a logical O, with which elements 11 and 12 are closed. Logical 1, remaining from the second inverter 16, the retium element 10 opens in the channel interval allocated to the conference room. connection, the PCM signal of the subscriber passes through the elements 10 13 to the output of the device and then to the switching device for distribution to the channel interval. This mode of operation of the device is maintained for as long as the first user speaks and the second subscriber serves. The second subscriber leads the transmission, the first subscriber listens. A logical O appears at the output of the PDA-1, with which the fourth element 11 is kept closed, and the output of the RS-2 is a logical 1. The fifth element 12 opens with a signal of the logical O, coming from the second inverter 15 and TsOR-2, and the PCM signal of the second subscriber passes through the elements 12 and to the output of the device the same as in the first case. Thus, if only one subscriber speaks, the SPM signal passes through the device each cycle without alternate transmission. The transmission is carried out simultaneously by both subscribers. At the output of the PDS-1 and TSOR-2, logical 1 appears, which opens the fourth element 11, and elements 12 and 10 are closed by logical O coming from the inverters 16 and 15, respectively. In the channel interval allocated for the conferencing connection , elements 12 and 13 alternately pass the PCM signal of the first and second subscribers, coming from the second element 14. To the input of the second element 14 in the odd cycle, the first element 8 receives the PCM signal of the first subscriber, i.e. the NTS opens the first element 8, in an even cycle, the CHZ signal opens the second element 9 and the PCM-, the second subscriber’s signal goes to the input of the second element 14. .. Thus, the alternating front part of the subscribers ’voice signals Simultaneous transmission and operation of the entire device is generally determined by the operation of digital speech detectors. Digital speech detectors detect the presence or absence of a speech signal from a digital stream in each channel. Various principles of speech detection can be used to construct the POR, based on the analysis of the digital stream of the PCM signal. Digital speech detector works as follows (fig.Z). From the compaction equipment, a group is received at the input of the first element 17, a second PCM signal. . If there is a speech signal in the channel at the output of the first element 1, a stream of units of the corresponding PCM signal is separated, and from the first unit the RS flip-flop 19 is set to one state and kept in this state until The decoder 21 will not receive a signal that returns it to its original zero state on the input. In the diagram of FIG. 3, the RS-flip-flop is executed in the YLI-NOT basis, and if it is executed in the NAND basis, the signal at the output of the first element 17 needs to be inverted. A logical signal 1, taken from a single (top in the diagram) output of the trigger 19, is an output signal of the CPOR and the second element 18 opens through this signal, through which synchronization pulses from the compaction equipment follow, with a period of 2 ms. Binary counter 20 counts these pulses and, when a combination is established at the output of the binary counter, corresponding to the setting of the decoder 21, the RS flip-flop 19 is reset to the zero state. Thus, the time of the counting of the binary counter 20 determines the time Td, the switching off of the POR, and depends on the number of bits of the binary counter 20 and the period of the pulses CS, ,,,, 2 fur 2 2 where 11 is the number of bits of the binary 20. If the TgbUA interval is chosen sufficiently long, on the order of 50–200 ms (and accordingly the number of bits of the binary counter is 20), then at this interval there is a high probability (close to 1) in the selected PCM section if the speech signal in the channel is wits one, from which binary counter 20 is reset to zero This state is not calculated to the final sum, determined by the setting of the decoder 21. Due to this, the COR is kept in the on state and in speech pauses not exceeding T8 (. The device of the conference links in systems with pulse-code modulation can be used in ring communication systems without a central switching station, when one subscriber participates in each intermediate station in a conference connection. For this, signals from the linear path are fed to the inputs of the first subscriber, and signals from the local subscriber to the inputs of the second subscriber. Signals from the output of the device come back to the linear path. In order to eliminate the repeated imposition of speech signals during their circulation around the ring, it is necessary to envisage some measures for organizing the conference channel. In the event that in the ring transmission system, the forward and reverse paths are spatially traversed in various ways, these measures are summarized as follows. For a conference connection, two 8-bit channel intervals are fixed in the transmission system, for example, the i-th and (1 + 1) -th. In this case, the i-th channel, the digital stream of which is directed from the main point that performs the functions of synchronization and forming the structure of the transmission cycle, is used only for transmission. At the main point, the signals of the i-ro channel are transmitted to the (1 + 1) -th channel that is easy to implement with a simple 8-row shear resistor, from which subscribers receive summed signals from other subscribers.

Input odd U, LIK / ICL

UI, n - (, UCH

Bt

foot

Interval

Phase 2 in this case, when the forward and reverse transmission paths are parallel (for example, in the same cable) and there is the possibility of connecting to the reverse path, they also specialize by purpose. The forward path, directed from the main point, is used as a transmitter, and the return path is used as a receiver. In this case, only one slot is used for conference conferencing. The use of the proposed device can significantly improve the quality of a conference

Claims (3)

1. CONFERENCE DEVICE IN SYSTEMS WITH PULSE-CODE '· MODULATION (PCM) containing input and output registers, a memory block and a buffer register connected in series, the output of the input register being connected to the input of the memory block, distinguished by the fact that in order to improve the quality of the conference call, the PCM signal combining unit was introduced to it, the PCM signal input of the first subscriber of the PCM signal combining unit connected to the output of the memory unit, the PCM signal of the second subscriber of the PCM combining unit als connected to the output 'of the buffer register, the input slot is connected to the input of combining unit timeslot the PCM signals, the output of which is connected with the output register input, the fourth input _{of the} combining block PCM signal is input S Nogo odd cycle, a fifth block input combining PCM signals is an even cycle input. SO .. 1100750 2. The device according to π. 1, characterized in that the PCM signal combining unit contains five AND elements, two OR elements, two inverters and two digital speech detectors, the first inputs of the first and second elements AND being the inputs of the odd and even cycles, respectively, the second inputs of the first and second elements And connected to the first inputs of the respective voice detectors and are inputs of the group PCM signal of the first and second subscribers, respectively, the second inputs of digital voice detectors are combined and connected to the first, inputs of the third , the fourth and fifth elements And are the input of the channel interval, the output of the first digital speech detector is connected to the second input of the fourth element And and through the first inverter to the second input of the fifth element And, the third. whose input is connected to the first input of the second digital speech detector, the output of which connected to the fourth input of the fifth AND element, the third input of the fourth AND element and through the second inverter to the second input of the third AND element, the output of which is connected to the first input of the first OR element, the second and third whose outputs are connected to the outputs of the fourth and fifth AND elements, respectively, the third input of the third AND element is connected to the second input of the first AND element, the output of which is connected to the first input of the second OR element, the second input of which is connected to the output of the second AND element, the output of the second OR element connected to the fourth input of the fourth element I. I 3. The device according to claim 2, characterized in that the digital speech detector contains two AND elements, an RS trigger, a binary counter and a binary code decoder connected in series, the first input of the first AND element being an input of a group PCM signal, the second input being an input channel interval, the third input is the input of the discharge of the PCM signal code word, the output of the first element And is connected to the input S of the RS-trigger and the first input of resetting the binary counter to zero, the second input of the binary counter is connected to the output of the second element Having a first input coupled to an output RS-flip-flop, the input R is connected to output binary decoder, a second input of the second AND gate is input to the frame synchronization.