SU1584112A2 - Device for detecting noise-like signals - Google Patents

Abstract

The invention relates to telecommunications. The purpose of the invention is to reduce the search time for noise-like signals. The device for detecting noise-like signals contains a comparison unit 1, an inverter 2, an EL OR 3 unit, a r-4 reference signal, counters 5 and 6 pulses, a synchronizer driver 7 consisting of decoders 11 and 12, and an OR 13 unit, and also, AND 8, EL AND 9, and Mr. 10 clock pulses. When the elements of the reference and input sequences coincide, the counters 5 and 6 calculate these and further matches, respectively. When the counters 5 and 6 reach the specified values, the driver 7 sends an impulse to the device output through its first and second branches and simultaneously closes the counters 5 and 6. If the input and reference sequence elements do not match, the comparison unit 1 outputs the signal "0", which through inverter 2 and power OR 3 zeroes counter 6 and prohibits the passage of the current clock pulse to r-4 through power 8. Thus, a shift (delay) of the reference sequence in relation to the input signal sequence occurs. The goal is achieved by the introduction of an inverter 2, an EL OR 3 and a counter 6. The device according to claim 2 f-ly is characterized by the performance of the former 7. 1 Cp f-ly, 1 ill.

Description

, The invention relates to electricity (communication, can be used in receivers of information transmission systems using noise-like signals for their detection and time synchronization, and is an improvement of the device according to aut. No. 1429326. The purpose of the invention is to reduce the search time for noise-like signals .

The drawing shows a block diagram of a device for detecting noise-like signals.

The device for detecting noise-suppressing signals contains a block 1 of comparison, an inverter 2, an element OR 3, a generator 4 of a reference signal, a counter 5 pulses, an additional counter 6 pulses, a driver 7 sync signals, an element AND 8, an element NAND 9 and a generator 10 clock pulses. Shaper 7 contains the first 11 and second 12 decoders and the element OR 13.

The device works as follows.

After switching on the device, the counter 5 and the additional counter 6 are zeroed. The first input of block 1 receives an input periodic pseudo-random sequence of zeros and ones, the second input receives a periodic pseudo-random sequence of the reference signal, clocked by generator 10 through the hidden element 8. block 1 generates a signal 1, which permits the passage of the current clock pulse through the element AND-NOT 9 to the clock inputs of the counter 5 and the additional counter 6 and going to the generator 4 through the element And 8. This happens as long as the elements of the input and reference sequences are the same. Counter 5 counts these matches. When the counter reaches 5,. equal to N, the length of the reference signal, the driver 7, through its first branch consisting of the first decoder 11 and the element OR 13, gives a pulse to the output of the device and simultaneously turns the counter 5. Additional counter 6 counts the next matching elements of the input and

five

0

0

0

five

0

reference sequences. When the additional counter 6 reaches the value of n logj (N + 1), the controller 7, via its second branch, consisting of the second decoder 12 and the element OR 13, sends a pulse to the output of the device and simultaneously completes the additional counter 6 through the element OR 3.

Since the output of the imaging unit 7 is connected to the reset inputs of both counters, they are nullified by the pulse that came first in the first or second branch of the imaging unit 7. If the input elements and the jiocontensions do not match, unit 1 generates a signal O, which through inverter 2 and the element OR 3 resets (zeroes) the additional counter 6 and. prohibits the passage of the current clock pulse to the generator 4 through the element And 8, i.e. there is a shift (delay) of the reference sequence with respect to the sequence of the input signal.

Claims (2)

Invention Formula one . The device for detecting noise-like signals by auth. No. 1429326, characterized in that, in order to reduce the search time for noise-like signals, the inverter, the OR element and the additional pulse counter, the clock input and the output of which are connected to the output of the NAND element and to the auxiliary input of the clock generator, are output respectively which is connected to the second input of the OR element, the inverter input is connected to the output of the comparison unit. 2. A device according to claim 1, characterized in that the sync pulse generator contains first and second decoders, the outputs of which are connected respectively to the first and second inputs of the OR element, the output of which is the output of the sync pulse generator, the inputs of the first and second decoders are respectively input and an additional input of the sync pulse generator.