Automatic color tuning system with variable gain APC circuit

Details Automatic color tuning system with variable gain APC circuit Automatic color tuning system with variable gain APC circuit

1987-06-02

1988-08-23

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

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358 25, H04N 945

Patent

active

047664835

ABSTRACT:
An automatic color tuning system includes a counter controlled oscillator that is started in the middle of its controllable frequency range. If the counter counts around and no color burst signal is detected, the oscillator is stopped. Whenever the oscillator is sweeping, an automatic phase control circuit is operated at low gain for assuring that the oscillator will be close to the frequency of the color burst signal when lock-up occurs. Whenever the oscillator is stopped, the automatic phase control circuit gain is made high. Once the automatic phase control circuit locks up the oscillator to a color burst signal, a subsequent loss of the color signal does not re-initiate the counter.

REFERENCES:
patent: 4015287 (1977-03-01), Hovens
patent: 4255759 (1981-03-01), Ohmori et al.
patent: 4443769 (1984-04-01), Aschwanden et al.
patent: 4477831 (1984-10-01), Hosoya
patent: 4544943 (1985-10-01), Quan
patent: 4561014 (1985-12-01), Douziech et al.

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