Muting circuit for a radio receiver

Details Muting circuit for a radio receiver Muting circuit for a radio receiver

1974-11-25

1976-02-17

Griffin, Robert L.

325348, H04B 110

Patent

active

039394310

ABSTRACT:
A zero crossing detector and one shot circuit connected to receive audio frequency signals from a receiver and provide a pulse each time the signal crosses a reference level, first and second one shot timers connected to receive the pulses and provide pulses in response thereto which coincide with the zero crossing of a predetermined signal it is desired to mute, coincidence gates receiving the one shot pulses and the delayed pulses and cooperating with a missing pulse detector and a relay in the receiver to mute the receiver whenever the pulses from either of the one shot timers coincide with the pulses from the zero crossing detector, which coincidence indicates a signal of the frequency it is desired to mute.

REFERENCES:
patent: 3437937 (1969-04-01), Warfield
patent: 3564419 (1971-02-01), Yackish
patent: 3603884 (1971-09-01), Zaura, Jr.
patent: 3633112 (1972-01-01), Anderson
patent: 3758856 (1973-09-01), Fromm
patent: 3843928 (1974-10-01), Nishimura et al.

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