Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1989-02-10
1991-01-15
Shepperd, John W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
H04N 965
Patent
active
049857541
ABSTRACT:
A high index color encoding system (10) is provided for the purpose of receiving RGB video input from a personal computer or similar device and generating video signals in other formats for use by conventional video equipment. The color encoding system (10) includes operational circuitry (30) adapted to shape and modify the chrominance portions of the signals at a relatively high carrier frequency of four times the NTSC standard frequency with the lower NTSC output carrier being reconstituted by a doubly balanced mixer (266) component, thus substantially improving signal quality. The operational circuitry further includes synchronization generation circuitry (148), a Y, I, Q matrix (66) for creating luminance and chrominance components from RGB signals, an I, Q modulator (96) for producing high quality chrominance output and a dynamic aperture (246) for enhancing the rise slope of the luminance signal, among other components. Various available video outputs to the system (10) are user selectable and user adjustable for compatibility with desired end use equipment and formats. The primary expected uses of the system are in graphics generation applications, utilization of conventional video equipment for computer video display and in memorialization of computer display sequences.
REFERENCES:
patent: 3732360 (1973-05-01), Breimer et al.
patent: 4402006 (1983-08-01), Karlock
Hughes Michael J.
Shepperd John W.
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