Digitally-controlled color signal generation means for use with

Details Digitally-controlled color signal generation means for use with Digitally-controlled color signal generation means for use with

1980-01-08

1981-07-14

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340725, 340744, 340800, 340814, 358 17, G06F 314

Patent

active

042789729

ABSTRACT:
A microcomputer including a video generator and timing means which provides color and high resolution graphics on a standard, raster scanned, cathode ray tube is disclosed. A horizontal synchronization counter is synchronized at an odd-submultiple of the color subcarrier reference frequency. A "delayed" count is employed in the horizontal synchronization counter to compensate for color subcarrier phase reversals between lines. This permits vertically aligned color graphics without substantially altering the standard horizontal synchronization frequency. Video color signals are generated directly from digital signals by employing a recirculating shift register.

REFERENCES:
patent: 3571513 (1971-03-01), Ward
patent: 3624634 (1971-11-01), Clark
patent: 3771155 (1973-11-01), Hayashi
patent: 3877009 (1975-04-01), Kanie et al.
patent: 3878536 (1975-04-01), Gilliam
patent: 4093960 (1978-06-01), Estes
patent: 4119954 (1978-10-01), Seitz et al.
patent: 4119956 (1978-10-01), Murray

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