VIR chroma system

Details VIR chroma system VIR chroma system

1974-08-23

1976-04-13

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 912

Patent

active

039507807

ABSTRACT:
A reference signal contained in the vertical blanking interval of the transmitted television signal is used in the color television receiver for automatic hue and saturation control. This vertical interval reference (VIR) signal includes a chrominance reference portion and a black level reference portion. The chrominance reference portion contains hue indicative information in that one of the color difference signals is zero and saturation indicative information in that one of the color signals is zero. The receiver is responsive to the VIR signal once during the black level reference portion to establish a zero reference for the hue control circuit and for the saturation control circuit. The receiver is responsive to the VIR signal a second time during the chrominance reference portion to set proper hue and saturation by automatically reducing to zero any differences between the indication of hue and saturation obtained from the VIR chrominance reference portion and the established zero references.

REFERENCES:
patent: 3673320 (1972-06-01), Carnt et al.
patent: 3755617 (1973-08-01), Ichida
patent: 3780218 (1973-12-01), Rennick

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