Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1976-10-06
1978-05-09
Griffin, Robert L.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 28, H04N 962, H04N 9535
Patent
active
040890252
ABSTRACT:
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 short duration during each horizontal line in which a VIR signal may be present. 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.
REFERENCES:
patent: 3755617 (1973-08-01), Ichida
patent: 3867010 (1975-02-01), Rzeszewski
patent: 3950780 (1976-04-01), Freestone
Banker Robert O.
Brown Charles T.
Ghaem-Maghami Sanjar
Holshouser Howard E.
Wachter Kenneth J.
General Electric Company
Griffin Robert L.
Psitos Aristotelis M.
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