H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/59
H04N 9/68 (2006.01) H04N 9/64 (2006.01)
Patent
CA 1100228
SO999 VIR-CONTROLLED COLOR CORRECTION FOR COLOR VIDEO SIGNAL RECEIVING APPARATUS ABSTRACT OF THE DISCLOSURE Hue and color saturation are controlled in response to a received VIR signal, the latter having a chrominance reference portion and a luminance reference portion. The level of a pre- selected one or more demodulated color signals which are produced by the color demodulator in color video signal receiving apparatus is detected during the time that the VIR signal is received. The level-detected demodulated color signal is used to produce a con- trol signal for controlling the hue or color saturation. A storage circuit, such as a capacitor, is provided to store the control sig- nal throughout the duration which separates successive VIR signals. A VIR detector is provided for detecting the presence of a VIR signal in the received video signal; and when the absence of a VIR signal from the received video signal is detected, the control signal storage circuit is preset to a predetermined value. By so presetting the storage circuit, the time required for successful VIR-controlled color correction is minimized when the video signal receiving apparatus is switched from, for example, one broadcast channel which does not include a VIR signal to another broadcast channel which does include a VIR signal. In a preferred embodiment, both hue and color saturation are controlled in response to a VIR signal. The level of a selected color difference signal (R-Y), produced during the chrominance ref- erence portion of the VIR signal, is used to control hue; and the level of a simulated color drive signal (B), also produced during the chrominance reference portion of the VIR signal, is used to control color saturation. -i-
296357
Isono Katsuo
Sanada Seiji
Gowling Lafleur Henderson Llp
Sony Corporation
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