H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/59
H04N 9/68 (2006.01) H04N 9/64 (2006.01)
Patent
CA 1099399
ABSTRACT Color control apparatus for use in video receiving apparatus of the type utilizing a VIR signal having at least a chrominance reference signal therein. A chrominance channel provides for processing the chrominance component included in the color video signal, and an extracting circuit separates burst and chrominance reference signals from the received color video signal. Predetermined parameters in the separated burst signal and a corresponding parameter in the chrominance reference signal are detected. A common amplifier is responsive to the detected parameters for producing an amplified control signal which, in turn, adjusts the color characteristic of the processed chromin- ance component in accordance with the amplified control signal. The detected parameters may be the level of the respective burst and chrominance reference signals, which levels are detected by comparison with a reference level. The detected burst signal level thus is used in an automatic chrominance control circuit. The detected chrominance reference signal level is used in a color saturation control circuit. Both of these control circuits are connected with the common amplifier for controlling the color saturation level of a processed chrominance component. Also the detected parameter may be the respective phases of the burst and chrominance reference signals with respect to a local oscillating signal used for demodulating the chrominance component. In that event, the detected burst signal phase and chrominance reference signal phase are used in automatic phase control and hue control circuits, respectively, both of these control circuits being connected to the common amplifier. In a preferred embodiment, the color control apparatus includes an ACC and a saturation control circuit connected to one common amplifier for controlling color saturation. An APC circuit and a hue control circuit is connected to another common amplifier for controlling the hue characteristic of the ultimately demodulated color signals.
297175
Isono Katsuo
Sanada Seiji
Gowling Lafleur Henderson Llp
Sony Corporation
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