G - Physics – 09 – G
Patent
G - Physics
09
G
350/40
G09G 5/36 (2006.01) G09G 1/02 (2006.01) G09G 1/28 (2006.01) G09G 5/06 (2006.01) H04N 7/13 (1990.01)
Patent
CA 1326536
METHOD AND APPARATUS FOR GENERATING VIDEO SIGNALS ABSTRACT OF THE DISCLOSURE A video signal generator employs a host processor subsystem (11), display controller system (18), display generator subsystem (20), refresh memory subsystem (24), and video data system (28) to process pixel data in parallel to achieve high pixel frequency rates permitting large flicker-free images. To achieve high pixel frequencies, parallel processing is maintained from the bit map memory (36) until the data is processed by the digital-to- analog converter (DAC) (54). The display generator subsystem (20) outputs a multi-bit digital data address signal (35) which is used to address a plurality of bit map memory (BMM) arrays (36). The BMM arrays (36) operate in parallel, and the data (35) is read into a portion of each BMM array (37, 39) until the array (37, 39) is filled. The data is read out of the arrays (37, 39) in parallel (32) and into a plurality of BMM output multiplexers (MOM) (38), new data continuously being read into each BMM array (37, 39). The MOM (38) time division multiplexes the data signal (32) into data nibbles (26), of fewer bits,representing the color intensity of the data signals (32). The data nibbles (26)are multiplexed by a plurality of video multiplexers (40) to produce a multi-bitcolor intensity code (44) which is used to address a plurality of color look-up tables (CLUTs) (40). The CLUTs (40) select the array data for display, and generate color codes (48). The color codes (48) are multiplexed to the desired pixel frequency rate and are input into DACs (54) to drive a monitor (58).
603516
Hughes Aircraft Company
Sim & Mcburney
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