SU767979A1 - Device for controlling quality of communication channel - Google Patents

Description

(54) DEVICE FOR QUALITY CONTROL OF COMMUNICATION CHANNEL

one

This invention relates to radio.

A device for controlling the quality of a communication channel is known, comprising a sequentially connected matching unit, a selection block for a controlled parameter, an AND element, the second input of which is connected to the output of a quantizing pulse generator, and an error counter, as well as a summing counter, a time stamp generator and an indicator

However, the known device does not have the necessary accuracy of control.

The purpose of the invention is to increase 15 accuracy and control.

To do this, a device for controlling the quality of the communication channel, containing a serially connected matching unit, a SIOC of the extraction of the monitored parameter 20, an element AND whose second input is connected to the output of a quantizing pulse generator, and an error counter, as well as a summing counter, a time generator 25 and an indicator , n blocks of matches were introduced according to the number of initiated communication quality states, n additional AND elements and a metering session counter, with output 30

the quantizing pulse generator is connected to the second signal input of the error counter, the zero input of which is connected to the combined first inputs of additional elements And, the output of the label generator BpeMeHVi and the input of the metering session counter, the output of which is connected to the zero input of the summing counter, and the outputs of the error counter are connected to the inputs of the corresponding matching blocks, the outputs of which are connected to the second inputs of the corresponding additional elements AND, the output of the first of which is connected to the signal the input of a summing counter, the output of which and the outputs of the remaining p-1 additional Elements And are connected to the corresponding inputs of the indicator, and the unit of the monitored parameter is made in the form of an amplitude selector with the following threshold, whose signal input is connected to its threshold input through serially connected Hz "1 Lit. detector, low pass filter and voltage divider. The drawing shows a structural electrical circuit of the proposed device.

The device for monitoring the quality of the communication channel comprises a matching unit 1; a monitored parameter extraction unit 2 comprising an amplitude selector 3 with the following threshold, an amplitude detector 4, a low-pass filter 5 and a voltage divider b; element And 7; 8 quantizing pulse generator; counter 9 errors; blocks 10-13 matches; elements AND 14-17; totalizer counter 18; generator 19 time stamps; counter 20 measurement sessions and indicator 21 o.

The device works as follows.

The signals from the outputs of the communication channels are fed to block 1, designed to match the communication channels with the device Quality Control channels. From the output of block 1, the signals are transmitted to an amplitude selector 3 and simultaneously to series-connected amplitude detector 4, filter 5 and voltage divider 6, which form a threshold voltage applied to the threshold input of the amplitude selector 3. If the signal amplitude is less than the threshold voltage, t At the output of the amplitude selector 3, a signal appears, the duration of which characterizes the value of the quality of the communication channels. The higher the quality of the communication channels, the longer the total duration of the signal during the measurement session at the output of the amplitude selector 3. The duration of the signal at the output of the amplitude selector 3 depends on the quality of the signal and on its shape. Each waveform for a given quality of the communication channel corresponds to its own signal duration.

From the output of the amplitude selector 3, the signals arrive at the input of the element And 7, to the second input of which a quantum is supplied; the pulses from the generator 8. As a result, at the output of the element 7 we get a signal sampled by the pulses of the generator 8. Next, the signal pulses are fed to the subtracting input of the counter 8 , the summing input of which is pulsed directly from the generator 8. The number of pulses from the output of the element And 7 during the measurement session M is always less than the number of pulses received from the generator 8, Npej, i.e.

The difference in the number of pulses dM "and N accumulated in counter 9 during a session of T f and the corresponding states of the cascades of counter 9 characterize the quality of the communication channels. For a given quality of communication channels of a given waveform, there is a definite AN mapped to the x-state of the counter 9. Due to the fact that various random noise is acting on the communication channels, the number of pulses M beyond Tj is a random variable characterized by its main parameters; expectation and dispersion, due to randomness N (j is the number of impulses AN behind T. also will be a random variable with the same dispersion, but with a different expectation.

A more accurate control of the current state of the communication channels requires large deviations of N from its mean value (expected value), both upwards and downwards, should be excluded. This is achieved by connecting blocks 11–13 matches to the outputs of those cascades of counter 9, the state of which determines the quality of communication channels with a given spread, i.e. at the same time, the low and high bits of the counter 9 are not used to monitor the current state of the communication channels.

The signals from the outputs of the blocks 11-13 through the elements 15-17 are fed to the indicator 21. The second inputs of the elements 15 15-17 are pulsed from the generator 19 of the time stamps. The signals from the inputs of the And 15-17 elements correspond to certain states of the quality of communication channels (the number of their gradations can be any).

The outputs of the cascades of the counter 9, which determine the lower bits, are connected to a block 10 of coincidence. The signals from the output of the block 10 coincidence through the element And 14 are fed to the input of the summing counter 18. The second input of the element And 14 is pulsed from the generator of the time stamp 19. The capacity of the summation counter 18 corresponds to the quality condition of the communication channels in which they are to be repaired or replaced with serviceable ones. The signal from the output of the counter 18 is applied to the indicator 21. The count of the counter .18 is produced by pulses of the time stamp generator 19 through the counter 20 of the measurement sessions.

The technical and economic efficiency of the communication channel quality control device is to increase the control accuracy.

Claims (1)

Invention Formula 1, A device for monitoring the quality of communication, comprising a serially connected matching unit, an output parameter of the monitored parameter, an AND element, the second input of which is connected to the output of a quantizing pulse generator, and an error counter, as well as a summing counter, a time stamp generator, and different indicator By the fact that, in order to increase the control accuracy, n blocks were entered into it according to the number of initiated quality conditions of the communication channel, n additional elements AND and the metering session counter, while the output of the quantizing pulse generator is connected to the second signal input of the error counter, zero input which middle with the combined first inputs of additional elements And, with the output of the generator of time stamps and with the input of the metering session, the output of which is connected. to the zeroing input of the summing counter, and the outputs of the error counter are connected to the inputs of the corresponding matching blocks, the outputs of which are connected to the second inputs of the corresponding additional And elements, the output of the first of which is connected to the signal input of the totaling counter, and the outputs of the remaining n-1 additional elements And connected to the corresponding inputs of the indicator. 2, The device according to claim 1, characterized in that the selection block of the monitored parameter is made in the form of an amplitude selector with the following threshold, the signal input of which is connected to its threshold input through series-connected amplitude detector, low pass filter and voltage divider. S Sources of information accepted. Attention in the examination 1 - USSR Copyright Certificate 499682, cl. H 04 L 1/00, 1973 (prototype),