Wide band automatic frequency control circuit

Details Wide band automatic frequency control circuit Wide band automatic frequency control circuit

1975-02-28

1976-03-16

Murray, Richard

Telegraphy

Systems

Simplex-reversing periodic

325418, H04N 706

Patent

active

039447251

ABSTRACT:
An automatic frequency control (AFC) circuit for a signal receiver having a tuner, intermediate frequency (IF) amplifier, video amplifier, and sync pulse separation means includes a discriminator coupled to the IF stage and a signal combining means coupled to the discriminator means and sync pulse separation means and to the tuner to effect a given "pull-in" range for the tuner in response to error signals from the discriminator and an increased "pull-in" range upon loss of sync signals from the sync pulse separation means when the tuner stage is increasingly detuned.

REFERENCES:
patent: 2962666 (1960-11-01), Pollak
patent: 3632864 (1972-01-01), Evans
patent: 3733432 (1973-05-01), Arimura
patent: 3796824 (1974-03-01), Baker
patent: 3858000 (1974-12-01), Merriweather

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