Television receiver automatic frequency control system

Details Television receiver automatic frequency control system Television receiver automatic frequency control system

1975-10-02

1977-03-29

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 560

Patent

active

040150755

ABSTRACT:
A television receiver includes a tuner, IF amplifier, video and audio processing circuitry and deflection circuits. Two quadrature detectors are driven from the IF amplifier, one tuned to the sound IF carrier frequency and the other tuned to the picture IF carrier frequency. A combining circuit accepts only negative-going error voltages from the first detector and only positive-going error voltages from the second detector to produce an AFC with a response curve defined by the sound IF frequency at one end and the picture IF frequency at the other end. The output of the combining circuit supplies a voltage controllable oscillator in the tuner.

REFERENCES:
patent: 3045060 (1962-07-01), Meyer
patent: 3459887 (1969-08-01), Baker
patent: 3469025 (1969-09-01), Evans
patent: 3737565 (1973-06-01), Ma
patent: 3940554 (1976-02-01), Masuda
patent: 3949158 (1976-04-01), Rzeszewski

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