Coded data generation or conversion – Analog to or from digital conversion – Multiplex
Patent
1993-11-02
1996-02-20
Williams, Howard L.
Coded data generation or conversion
Analog to or from digital conversion
Multiplex
395153, 345115, H03M 166
Patent
active
054932998
ABSTRACT:
A digital/analog conversion apparatus with a color palette RAM for a multimedia, comprising a first latch circuit for inputting a pixel address signal, a pixel mask register for selectively masking the pixel address signal from the first latch circuit in response to a control signal from a microprocessor interface circuit, a second latch circuit for storing digital color information temporarily, and first to third digital/analog converters for converting the digital color information from the second latch circuit into analog R, G and B color information. The palette RAM stores digital color information from the microprocessor interface circuit and outputs the digital color information stored in its location corresponding to the pixel address signal from the pixel mask register to the second latch circuit. The apparatus also comprises first to third switching circuits for inputting the digital color information from the color palette RAM, digital video color information from an external video medium and external digital color information from a pixel address signal input line and selectively outputting the inputted information in response to external first to third control signals, and a third latch circuit for transferring the output information from the second switching circuit to a digital color information output terminal.
REFERENCES:
patent: 4942391 (1990-07-01), Kikuta
patent: 5250933 (1993-10-01), Beaudin et al.
Cha Kwon H.
Hyun Jeong S.
Kim Min H.
Kwon Oh B.
Song Jae H.
Hyundai Electronics Industries Co,. Ltd.
Williams Howard L.
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