Muting circuit

Details Muting circuit Muting circuit

1978-03-14

1980-12-09

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

455234, H04N 560

Patent

active

042387710

ABSTRACT:
A muting circuit for a television or AM signal receiver which uses a synchronous detector.
The muting circuit includes an input terminal for receiving an amplitude modulated signal, a synchronous detector for detecting such AM signal, a circuit for supplying a reference signal having a predetermined frequency and phase to the synchronous detector, an amplifier, a circuit path for delivering to the amplifier the detected signal produced by the synchronous detector, a level detecting device connected to the output of the synchronous detector for producing an excess signal when the detected signal exceeds a predetermined level, an integrator for producing a muting signal in response to the production over an extended period of time of the excess signal, and a switching device connected to the amplifier for muting the signal produced by the amplifier in response to the production of the muting signal.

REFERENCES:
patent: 2904678 (1959-09-01), Malchow
patent: 3686430 (1972-08-01), Parker
patent: 3873925 (1975-03-01), Eastmond
patent: 3939425 (1976-02-01), Toyoshima
patent: 3979679 (1976-09-01), Bush et al.
patent: 4095191 (1978-06-01), Shibuya
patent: 4117406 (1978-09-01), Takahashi et al.

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