VIR hue control system

Details VIR hue control system VIR hue control system

1977-06-06

1978-11-28

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 9535

Patent

active

041278674

ABSTRACT:
An automatic hue control system for a color television receiver using a single sampling of a vertical interval reference (VIR) signal to establish the hue setting of the receiver. A VIR signal periodically appears during a pre-selected line in the vertical blanking interval of a broadcast video signal and includes a chrominance reference portion of such phase that one color difference signal as detected should be zero and another portion having no chroma content. Sampling of the VIR signal during at least a portion of the chrominance reference portion and AC coupling in the control loop enables the loop to respond to any transition in the one color difference signal between chroma reference times and no chroma times. Any such transitions are used to correct the hue setting of the receiver.

REFERENCES:
patent: 3673320 (1972-06-01), Carnt
patent: 3950780 (1976-04-01), Freestone

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