SU477531A1 - Periodic Pulse Isolation Device - Google Patents

Description

one

The invention relates to noise-resistant signal isolation and can be used to isolate bursts of periodic pulses or clock pulses in communication and control systems, as well as in television.

A device for extracting periodic pulses is known, comprising an input driver, a coincidence circuit connected directly to the driver output by one input, and a recorder through another delay unit.

A disadvantage of the known circuits is the low reliability due to the inertia of the frequency control circuits of the autogenerators or the gaps of one or several first pulses from the selected sequences.

In order to increase the reliability of operation, an anti-coincidence circuit is added to the proposed device, the inputs of which are connected in parallel to the inputs of the first coincidence circuit and the second coincidence circuit, one of the inputs of which is connected through the second delay unit to the output of the anti-coincidence circuit, In addition, the output of the second coincidence circuit is connected to the recorder directly, and the output of the first circuit is connected via the third delay unit.

The drawing shows the described device.

The device consists of input shaper 1, coincidence circuits 2 and 3, delay blocks 4-6, anti-matching circuit 7, recorder 8. If a packet is received from formation 1

from n pulses, following with period G, and other pulses, the intervals between which are different from the value T, then at the output of the coincidence circuit 2, connected to the shaper 1 by one input directly, and the other through a delay unit with rear window T,

a bundle of n-1 pulses will be allocated,

while there will be no first impulse

packs.

The anti-coincidence circuit 7, connected in parallel to the inputs of the coincidence circuit 2, selects the first and last (i) th pulse of the packet, as well as impulses with following intervals other than T. The anti-coincidence circuit 7 selected by the anti-coincidence circuit 7 is delayed by an interval of 7 in the block delays 5 and is fed to a coincidence circuit 3, at the other input of which the output pulses of the coincidence circuit act. In this case, at the output of the coincidence circuit 3, a single pulse will be generated, coinciding with the first burst of the packet delayed by the interval T.

In the delay block 6, a delay of a pack of -1 pulses per interval T occurs, so that when the recorder 8 receives a pulse from the coincidence circuit 3 and a pulsed packet of n-1 pulses following the delay, then we get the whole packet from n impulses, cleaned from impulses having intervals of a sequence different from the value of T.

A pulse packet passed to registrar 8 will be delayed by the value T.

In order to separate several bursts of pulses with different periods of following Tt, TZ, ..., T-k, the described circuits are connected in parallel, having delay blocks in each circuit at intervals T, T2, ..., T.

Subject invention

A periodic pulse extraction device containing an input driver, a coincidence circuit connected by one input to the driver output directly and the other through a delay unit, a recorder, characterized in that, in order to increase the reliability of operation, the device

additionally, an anti-coincidence circuit is introduced, the inputs of which are connected in parallel to the inputs of the mentioned coincidence nerve circuit and the second coincidence circuit, one of the inputs of which is connected through the second delay unit to the output of the anti-coincidence circuit, and the other to the output of the first coincidence circuit the match is connected to the recorder directly, and the output of the first circuit is through the third

delay block.

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