SU653752A1 - Device for locating noise occurrence spot in communication channels - Google Patents

Description

I

The invention relates to the field of signal transmission and can be used to detect the place of occurrence of interference in communication channels.

A device for detecting the place of occurrence in communication channels is known, comprising a matching unit whose output is connected to input filters combined, a threshold unit and a registration unit 1.

However, this device has insufficient detection accuracy.

The aim of the invention is to improve the accuracy.

To do this, the device for detecting the location of interference in the communication channels containing a matching unit, the output of which is connected to the input-integrated filters, the threshold unit and the registration unit, is used to transduce the signal amplitude into a unipolar signal, pulse shaper, switch, trigger, An element And and a gating pulse generator, while the output of each filter is connected through a serially connected signal amplitude converter to a unipolar signal, a threshold unit and a pulse shaper to responsible trigger input; the output, the trigger is connected via an element, the other input of which is connected to the output of the gating pulse generator, the input of the registration unit, and one of the trigger inputs is connected to the input of the key, the output of which is connected to the control inputs of the threshold unit.

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

Claims (1)

It contains a matching unit 1, the output of which is connected to the filters 2, 3 integrated at the input. The output of each filter is connected via a serially connected converter 4, 5 amplitudes of the signal into a unipolar signal, threshold block 6, 7, and pulse generator 8, 9 to the corresponding inputs of the trigger 10. The output of the trigger is connected through the element 11 to the input of the block 12 registration. Another input element And is connected to the output of the generator 13 gate pulses. One of the inputs of the trigger 10 is connected to the input of the key 14, the output of which is connected to the control inputs of the threshold blocks b and 7. The operation of the device consists in determining the portion of the occurrence of impulse noise drying, measured by measuring the difference in the propagation time of impulse noise in different portions of the frequency range of the communication channel. The device works as follows. From the channel output, the pulse interference enters the input of block 1 matching. Two filters 2 and 3 are connected in parallel to the output of this block, whose responses to the impulse effect will be delayed relative to each other by an amount determined by the difference in the values of the group delay time at the corresponding frequencies of the characteristics of the group delay time of the channel section from the place of occurrence of the noise to the channel output . The impulse response generated by the filter, after passing through the corresponding transformations, changes the state of trigger 10, which gives permission for the arrival of gates from the generator output 13 of gates through element 11 to block 12. With a corresponding delay, a signal arrives at the other input of trigger 10, corresponding to the response of filter 3 to pulsed Inactivity and returns the trlgger to its initial state. In this case, the element And closes and the pulse counting; block 12 registration is terminated. The same signal controls key 14, by means of which the integrators in threshold blocks 6 and 7 are discharged, and the device returns to its original state. By knowing the frequency of the gating pulses and their number, recorded by the recording unit, one can determine the difference in the delay time in different parts of the frequency range, which is an indication of the place where the impulse noise occurred. An apparatus for detecting the place of occurrence of interference in communication channels, comprising a matching unit whose output is connected to input filters combined, a threshold unit and a recording unit, characterized in that, in order to improve the accuracy, signal amplitude converters are inserted into a single-pole signal , pulse shaper, key, trigger, gates, and the generator of gating pulses, and the output of each filter is connected via serially connected signal amplitude to single-field converter A real signal, a threshold unit and a pulse shaper to the corresponding trigger inputs, the output of which is connected via an And element, another input of which is connected to the output of the strobe pulse generator, to the input of the registration unit, and one of the trigger inputs is connected to the input of the key the inputs of the threshold block. Sources of information taken into account in the examination 1. USSR Author's Certificate Co 221046, cl. H 04 B 3/46, 1966.