Manual tint control circuit in the color APFC loop mixes two sub

Details Manual tint control circuit in the color APFC loop mixes two sub Manual tint control circuit in the color APFC loop mixes two sub

1978-06-07

1979-11-06

Stellar, George G.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 9535

Patent

active

041737709

ABSTRACT:
A tint control circuit for color television receivers includes a voltage-controlled oscillator for locally generating a color subcarrier, a variable phase shifter shifting the phase of the generated subcarrier in dependence on a manually adjusted DC control voltage, and a phase detector which allows a received color burst to be supplied to a load circuit in dependence on the difference in phase between the color burst and the DC-controlled, variable phase-shifted subcarrier in order to derive a DC control voltage from the load circuit which controls the voltage-controlled oscillator.

REFERENCES:
patent: 3454708 (1969-07-01), Curtis et al.
patent: 3483316 (1969-12-01), Hickok
patent: 3743764 (1973-07-01), Wittmann
patent: 3781701 (1973-12-01), Cecchin et al.

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