SU886307A2 - Device for transmitting and receiving discrete signals - Google Patents

Description

one

. The invention relates to communications and can be used in data transmission systems.

According to the main auth. No. 767998, a device for transmitting and receiving discrete signals is known, comprising a serially connected encoder, modulator, communication channel, selective amplifier, notch filter, signal conditioner, delay unit and decoder, as well as a reverse communication channel, two control units, threshold unit and serially connected power meter, integrator, signal converter and impulse noise counter, the output of which is connected to the input of the first control unit, the output of which is connected to the control input of the decoder and the first the reverse link path, the output of which is connected to the corresponding inputs of the encoder and modulator, while the second output of the pulse noise counter is connected to the second input of the integrator, the second output of which is connected to the input of the threshold unit, the output of which is connected to the input of the second control unit the second control unit is connected to the second input of the reverse link and to the control inputs of the selective amplifier, the delay unit and the signal conditioner, and the output of the notch filter is connected to the input of the power meter the second input of the signal converter 1 ..

However, the known device has a relatively low speed

10 transfer.

The purpose of the invention is to increase the transmission speed.

This goal is achieved in that a serially connected digital discriminator and an additional control unit, as well as a command receiver, are inputted into the device, the output of the additional control unit being connected to another input

20 of the encoder, the output of the decoder is connected to the input of the command receiver, the outputs of which are connected respectively to the other inputs of the first and second control units.

25

The drawing shows a structural electrical circuit of the proposed device.

A device for transmitting and receiving discrete signals comprises an encoder 1, 30 modulator 2, communication channel 3, selective amplifier 4, notch filter 5, signal former 6, delay unit 7, decoder 8, reverse communication channel 9, two units 10 and 11 controls, a threshold unit 12, a power meter 13, an integrator 14, a signal converter 15, a pulsed noise counter 16, a digital discriminator 17, an additional control block 18, and a command receiver 19.

The device works as follows.

The signal from the input source (not shown) enters encoder 1, where it is encoded with a given initial kdsm, and then with the help of modulator 2 enters channel 3 to the input of the selective amplifier 4 and through notch filter 5, the former B and block 7 enters decoder 8, where the receiver of the information is decoded and presented (not shown). To determine the relative level of the fluctuating noise, the signal from the output of the notch filter 5 is fed to the input of the meter 13, which measures the noise power in a single burst interval. The average noise power for the time interval equal to the duration of the adaptation interval (a given number of bursts) is determined by the integrator 14 by integrating the output signal of the meter 13. To ensure the independence of the noise power estimate from the intensity of the impulse noise from the 16-meter counter. integrator 14 introduces an integration weighting factor. The estimate of the average noise power obtained at the output of the integrator 14 is supplied through the threshold unit 12 to the input of the unit 11, in which the state is selected, the modem. In addition, this estimate is used to set a threshold level in converter 15, which determines whether impulse noise is present. Signals about the occurrence of impulse noise from the output of converter 15 are fed to a counter 16, which determines the amount of impulse noise in a given time interval, which is an estimate of the intensity of the impulse noise. This estimate is used in block 10 to select a transmission code.

In this way; Depending on the level of the fluctuating noise and the intensity of the impulse noise, the device selects the modem and codec state, which allows to maximize the transmission rate with a given confidence.

To the input of the digital discriminator. 17 signal about the amount of information to be transmitted. The digital discriminator 7 has two thresholds. If the amount of information is lower than the first threshold, then the adaptation of the device is prohibited, if the volume is higher than the first threshold, but lower than the second, only the modem is allowed;

5, adaptation of the entire device is developed.

From the output of the digital discriminator 17, the signal goes to an additional block 18, which produces

0 and sends commands to the input of encoder 1. The command signals from the output of encoder 1 through modulator 2, channel 3, selective amplifier 4, notch filter 5, .former b and block 7 are fed to the input of receiver 19. From the output

receiver 19, the codec and modem adaptation enable signals go to the first block 10 and the second block 11, respectively.

The proposed device allows

0 get a gain in effective transfer rate 1.5-2 times.

Claims (1)

1. USSR author's certificate 767998 cl. And 04 L 27/26 (prototype).