RU1789055C - Device for digital spaced conference communication - Google Patents

Abstract

The invention relates to digital communications technology. The goal is to improve the quality of communication by suppressing the subscriber's own signals and noise in the received signal, as well as increasing the reliability of maintaining operability upon failure of any of the transmitting nodes. The device contains M transmitting nodes (PU) 1, connected by an annular L C 2. Each PU contains a frame forming unit 3, a data receiving unit 4, a DAC 5, an ADC 6, the first 7 and the second 8 switches. Improving the quality of communication is achieved due to the fact that in block 4, the subscriber’s own signal is subtracted from the signal pressed from L C 2, which eliminates the local effect. The increase in reliability is achieved due to the fact that each of the control units can form an information frame, and thus, when the control unit generating the frame is terminated, its functions can be transferred to any other control unit. 3 ill. Yo

Description

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The invention relates to digital telecommunications, in particular to time division multiplexed communication systems, and can be used in digital telephony.

A known digital, distributed conference communication system is comprised of transceiver nodes coupled to each other by an annular communication line and a device for rearranging data from channel to channel. In this system, information switching in a frame is carried out in such a way that each conference call presents two time channels in a frame in which there is a total count of all participants, one channel being the data receiving channel and the other. goy - a channel for issuing data.

A known conference communication system in which the same principle of organizing a conference call is applied, but uses one time channel in a frame for a total count, and for clearing a channel after all subscribers have fetch information. a linear path is applied to a device which attenuates this channel. However, in these systems it is necessary to use additional special blocks: in the first case, a device is needed that rearranges the data from channel to channel, in the second case, a device that introduces attenuation into the conference-call channel after. sampling of information by all its participants. In addition, the total conference signal received by each participant has its own subscriber signal, which leads to a deterioration in the quality of conference calls and to increased requirements for the dynamic range of devices. The reliability of the system depends on the functioning of the centralized units for the implementation of conference communication modes: upon failure of a device that rearranges data from a channel to a channel or a device that attenuates a conference channel, a digital, distributed conference communication system 1 , 2 becomes inoperative.

The purpose of the invention is to improve communication quality by eliminating the subscriber’s own signal and subscriber noises from the received signal, as well as increasing reliability by maintaining the operability of the system as a whole upon failure of any of the nodes.

This goal is achieved in that in a digital distributed conference device, containing transceiving nodes interconnected by an annular communication line, into each of which a frame-forming unit is inserted, the first

input and first output connected to a ring line of communication, digital-to-analog converter, analog-to-digital converter, arithmetic-logic unit

5 data processing, the first and second switches, and the output of the first switch is connected to the input of an analog-to-digital converter, the output of which is connected to the second input of the frame forming unit, the second output of which is connected to the first input of the arithmetic-logical data processing unit, the second input of which the output of the analog-to-digital converter, and the output of the arithmetic-logical unit

15 data processing through a digital-to-analog Converter is connected to the input of the second switch.

In FIG. 1 shows a block diagram of a digital device, distributed

20 conferencing systems; in FIG. 2 and 3 are algorithms for processing conference signals and switching information in a frame,

.Digital, distributed

25 conference communication (Fig. 1) contains the first, second,..., Mth transceiver nodes 1-1, 1-2, .... 1-M, interconnected by an annular communication line 2. The transceiver node 1-1 consists of a block forming 30 no frame 3-1, block 4 receiving data

 digital to analog converter 5-1,

analog to digital converter 6-1,

the first and second switches 8-1 and 7-1,

N blocks of subscriber kits consisting of 91-9, 92-1, ..., 9N-1 receiving devices and .101-1, 102-1, ..., 10N-1 transmitting devices.

The device operates as follows. The block forming unit 3-1 provides information transmission to the annular communication line and reception of information from the line, reads and writes information into the temporary channels of the frame. Conference Calls of External Subscribers

45 with the subscribers of the first transceiver node are read by the block forming unit 3-1 and through the second output are fed to the first input of block 4-1, which performs the functions of switching and arithmetic-logical processing of the incoming information, and the resulting information from the output of block 4-1 to the input of the digital-to-analog converter 5-1 and using the second switch 7-1, it is distributed to the subscribers. The signals of the participants of the conference communication of the first transceiver node are fed to the inputs of the first switch 8-1, from the output of which the sampled speech signals are fed to the analog-to-digital input

converter 6-1. From the output of block 6-1, the encoded speech signals of the subscribers are fed to the second input of block 4-1 and to the second input of the block forming unit 3-1, which records this information in the time channels of the frame.

In FIG. 2 and 3, the operation of the second transceiver node is considered when the subscribers AB 1-2, ABV-2 and subscribers AB1-1, AB1-3 of the first and third transceiver nodes connected to it are in the same conference call. In this case, from the corresponding time channels of the frame, the block forming unit 3-2 reads the samples of subscribers AB1-1 and AB1-3 and sets the corresponding channels of the frame to the samples of subscribers of the second transceiver node AB 1-2 and AB2-2.

Conference signal processing algorithms are implemented as follows. The samples of the subscribers of the second transceiver node AB 1-2 and AB2-2 are received at the second input of the arithmetic-logical data processing unit 4-2, the samples of the subscribers of the first and third transceiver nodes AB1-1 and AB1-3 are received at the first input of the block 4-2 and summarize. Further, two options for processing conference signals are possible. In the first case (Fig. 2), the result of the first summation is added to the AB1-2 subscriber count and the result is sent to the AB2-2 subscriber, and the AB-2 subscriber count is added to the first summation and the received information goes to the AB1-2 subscriber. In the second case (Fig. 3), all the samples of the conference participants AB1-2, AB2-2, AB1-1, AB1-3 are sequentially summed up with further preliminary subtraction of their own sample before the information is sent to the subscriber, i.e. subscriber’s own counting AB1-2 is subtracted from the total result, and the result is sent to this subscriber, and information obtained by subtracting subscriber’s own counting from AB2-2 from the general result is subtracted from AB2-2.

The advantages in using the first or second processing algorithms are determined in a particular implementation by minimizing the cost of hardware and software, but in both cases

In this case, the quality of the conference call is improved by eliminating its own signal and intrinsic noise from the received signal subscribers. 5 In addition, the processing of conference communication signals by each of those transceiver nodes whose subscribers are in the conference communication and the absence of centralized blocks for 10 implementation of conference communication modes, such as in prototype 1. allows to increase the reliability of the digital system of distributed conference communication: when any of the transceiver nodes fails, only the subscriber connected to the failed transceiver node is dropped from the communication mode. A faulty transceiver node is automatically disconnected from the ring network due to the presence of a redundant ring communication line.

The use of the proposed device improves the quality and reliability of the digital distributed conference communication system.

Claims (1)

25 claims A digital distributed conferencing device comprising N transmitting nodes connected by an annular communication line, each transmitting unit co30 holding a data receiving unit, characterized in that, in order to improve the quality of communication by suppressing the own signals in the received signal and noise of the subscriber, as well as improving reliability 35 by maintaining operability in the event of failure of any of the transmitting nodes, each transmitting node contains a block for forming a frame, the first and second outputs connected to the annular 40 by a communication line, a digital-to-analog converter, an analog-to-digital converter, first and second switches, the output of the first switch being connected to the input of the analog-to-digital converter, 45, the output of which is connected to the second input of the frame forming unit, the second output of which is connected to the first input of the data receiving unit, the second input of which is connected to the output of the analog-to-digital converter, and the output of the data receiving unit through the digital-to-analog converter is connected to the input of the second switch. Calr g {yee-g) I. 1 - -f | C | 1 and 4.)  Jq. Meg.-a. Oh | {xvch-d FIG. 3: M. lelier