Muting circuit

Details Muting circuit Muting circuit

1985-02-25

1986-12-02

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455212, 455179, 455221, 3581911, H04B 116, H04N 550

Patent

active

046271015

ABSTRACT:
A television receiver has provisions for a second audio program (SAP) and an indication for signifying when the SAP is present and a muting circuit for muting the SAP, both in response to the output signal of a SAP detector. A filter capacitor is coupled to the detector output to prevent flicker of the indicator due to noise. To prevent the filter capacitor from incorrectly maintaining an indication of the presence of a SAP, thereby preventing proper SAP muting, when a new channel is selected, channel change signal causes a semiconductor switch to discharge the filter capacitor.

REFERENCES:
patent: 3568068 (1971-03-01), Russell, Jr.
patent: 3602822 (1971-08-01), Evans et al.
patent: 3662113 (1972-05-01), Von Recklinghauson
patent: 3882400 (1975-05-01), Hamada
patent: 4107614 (1978-08-01), Sugai
patent: 4112371 (1978-09-01), Ogita
patent: 4286290 (1981-08-01), Pyles et al.
patent: 4366442 (1982-12-01), Yamada
patent: 4450586 (1984-05-01), Fujino
patent: 4484174 (1984-11-01), Wilber et al.

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