SU1429326A1 - Device for detecting noise-like signals - Google Patents

Abstract

The invention relates to telecommunications and can be used in information transmission systems using probe-like signals to detect them. The purpose of the invention is to simplify the device by eliminating a number of functional blocks. The input signal in the form of a sequence of zeros and ones is compared with the signal of the generator 2 of the reference signal in comparison block 1, made in the form of a modulo two with inversion. When the sequence elements match, the comparison unit 1 generates signal 1. This signal allows the next clock pulse generator 7 clock pulses to generator 2 to pass through AND 3 and the current clock pulse to counter 5 through IS-NOT 4. Counter 5 counts the number of matches If the number of coincidences is equal to the length of the reference signal; a pulse of detection of noise-like signals appears at the output of the clock generator 6. If the elements of the compared sequences of the signal O of block 1 do not match, the reference signal is shifted by one element. 1 silt about. i (L

Description

The invention relates to telecommunications and can be used in receivers of information transmission systems using noise-like signals to detect them.

The aim of the invention is to simplify the device by eliminating a number of functional blocks.

The drawing shows a structural electrical circuit of a noise-like signal detection device.

The device for detecting noise-like signals contains a block 1 of comparison: a generator, a generator 2 of a reference signal,: element I 3, element I-HE 4, a counter 5 pulses, a driver 6 clock pulses and a generator 7 clock pulses

The device works as follows

: In the initial state of the noise-like signal detecting device Counter 5 is nullified. The second input of the comparison unit 1, made in the form of a modulo two with inrsion, receives an input periodic sequence of zeros and ones, and the first input - a periodic sequence of the reference signal from the output of the generator 2, clocked by the generator 7 through the open element I 3. If the elements of both sequences coincide, block 1 compares the signal 1, which permits the passage of the next clock pulse a generator 2 through the AND gate 3, and transmits a clock pulse to a valid tak tovsh input of the counter 5 through the AND-NO element 4 This happens as long as the elements of the input sequence and the reference signal coincide. Counter 5 counts these matches “When a counter is reached

With a value of 5 equal to the N-length of the reference signal, driver 6 delivers a pulse to the output of a noise-like signal detecting device and simultaneously zeroes counter 5.

If the elements of the input sequence and the reference signal do not match, block 1 of comparison compares signal O, which prohibits the passage of a valid clock pulse to generator 2 through the element I, i.e. the reference signal is shifted by one element.

Claims (1)

Invention Formula A device for detecting noise-like signals, comprising a series-connected clock generator, element I. and a reference signal generator, as well as a pulse counter, a clock generator and a comparison unit, the output of the clock generator being the output of the device, in order to simplify device by eliminating a number of functional blocks, an AND-NOT element is introduced, and the output of the reference signal generator is connected to the first input of the comparator unit, the output of which is connected inden to the second input of the AND element and the first input of the NAND element, the second input of which is connected to the output of the clock pulse generator, the output of the NAND element through the pulse counter is connected to the input of the sync pulse generator, the output of which is connected to the counter output pulse counter, and the second the input of the comparator is the input of the device, and the comparator is designed as a modulo two with inversion.