Color video signal generators

Details Color video signal generators Color video signal generators

1973-10-05

1976-02-17

Griffin, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 75, H04N 146, H04N 902

Patent

active

039394875

ABSTRACT:
A circuit arrangement for developing composite video signals used in color TV transmission using digital techniques. A plurality of N color select channels are gated by appropriate digital-type control signals. Each of the channels includes means for establishing the chroma amplitude and phase of the signal associated with a particular color. The phase and amplitude of each of the channels, which represents chrominance information, is developed by time shifting, gating, and phase shifting the basic 3,579,545 hz square wave. The chrominance information of each channel is combined at an appropriate LC filter. Luminance amplitude information is separately developed for each channel. Chrominance information, luminance information, and other video information (composite sync, combined video) are resistively added at a common node summing point. Other gating signals are also utilized so that the summed signal represents full chroma transmission information, such as is necessary for a standard TV signal.

REFERENCES:
patent: 2874212 (1959-02-01), Bechley
patent: 3668686 (1972-06-01), Strohmeyer
patent: 3749823 (1973-07-01), Warner
patent: 3761607 (1973-09-01), Hanseman
patent: 3771155 (1973-11-01), Yasuda

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