Vir signal detector for a color television receiver

Details Vir signal detector for a color television receiver Vir signal detector for a color television receiver

H - Electricity

04

N

350/62

H04N 7/087 (2006.01) H04N 5/10 (2006.01) H04N 17/04 (2006.01)

Patent

CA 1093204

38-TR-9447 ABSTRACT OF THE DISCLOSURE A VIR signal detector circuit for a color television receiver identifies the repetitive reception of a VIR color information signal on a predetermined horizontal line of video signal. The detection is accomplished with minimum interference from Gaussian and pulse-type noise to assure that VIR color control circuits in the receiver are activated only upon receipt of an actual VIR signal. The VIR signal detector operates by generating a viewing pulse of very short duration each horizontal line in which a VIR signal may be transmitted. An accumulator, set to respond to a predetermined number of simultaneous detections of the viewing pulse and a video signal exceeding a predetermined value, generates a control signal indicating that a VIR signal is being received.

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