Dual time constant AFC filter

Details Dual time constant AFC filter Dual time constant AFC filter

1980-08-18

1982-01-05

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358165, H04N 550

Patent

active

043097243

ABSTRACT:
An AFC circuit for a television system having stereophonic sound is disclosed. In response to a channel change, which causes a significant change in the level of the AFC error signal, the error signal is coupled substantially without modification to the local oscillator control terminal and the sound is muted. After an interval sufficient to permit frequency lock to be achieved the error signal is then coupled to the oscillator through a low pass filter and the muting operation is terminated.

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