Squelch circuit

Details Squelch circuit Squelch circuit

1978-02-21

1979-10-30

Richardson, Robert L.

325478, H04B 110

Patent

active

041729960

ABSTRACT:
A squelch circuit for use in an angle-modulation communication receiver includes a squelch switch responsive to a control signal generated by a squelch control circuit. The squelch control circuit has a level detector for detecting a carrier level of a received signal and a decision circuit which detects the presence of impulse noise in the received signal. The output of the decision circuit is supplied to a counter for counting the number of impulse noise occurrences in a predetermined time period. The logical product of the outputs of the level detector and the counter is formed to generate the control signal for the squelch switch.

REFERENCES:
patent: 3437937 (1969-04-01), Warfield
patent: 3546607 (1970-12-01), Dixon
patent: 3564419 (1971-02-01), Yackish
patent: 3633112 (1972-01-01), Anderson
patent: 3961268 (1976-06-01), Hansen
patent: 3995220 (1976-11-01), Hansen

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