RGBI to multilevel grey scale encoder

Details RGBI to multilevel grey scale encoder RGBI to multilevel grey scale encoder

1986-06-13

1988-04-19

Shepperd, John W.

Communications: electrical

Land vehicle alarms or indicators

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

358 13, G06F 314, H04N 1104, H04N 1112

Patent

active

047393122

ABSTRACT:
An encoder (500) encodes a TTL type of R,G,B,I video drive signal into a common multilevel grey scale digitally encoded composite video signal which is transmitted over a single coaxial cable (302). The incoming R,G,B,I bits, such as provided from a color computer (304, 306, 308, 310), are buffered and translated (50a, 50b) from TTL to ECL and fed to a common video digital-to-analog converter (100) along with translated composite sync information (312, 314, 10, 324). A white reference level signal is dynamically derived from the translated sync information (200, 202) and provided to the full height input of the video D/A converter (324, 100) which converts the translated R,G,B,I input into a 16 level multibit grey scale code in a linear function from full intensity white to black, with a seventeenth level being provided in the digitally encoded composite video signal to represent sync information.

REFERENCES:
patent: 3603962 (1971-09-01), Lechner

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