| US 7,349,135 B2 | ||
| Time multiplexed image data decompression circuit | ||
| George L. Eldridge, Long Beach, Calif. (US); Munir G. Salfity, Torrance, Calif. (US); and John Cheng Ming Tou, Rancho Palos Verdes, Calif. (US) | ||
| Assigned to Xerox Corporation, Norwalk, Conn. (US) | ||
| Filed on Oct. 25, 2002, as Appl. No. 10/281,422. | ||
| Prior Publication US 2003/0123071 A1, Jul. 03, 2003 | ||
| Int. Cl. H04N 1/36 (2006.01); H04N 1/64 (2006.01); H04N 1/411 (2006.01); G06F 3/12 (2006.01); G06K 15/02 (2006.01) | ||
| U.S. Cl. 358—515 [358/1.15; 358/1.16; 358/539; 358/426.01; 358/425] | 1 Claim |
| 1. A time multiplexed image data decompression circuit, comprising:
a compressor to divide color separation images into 8-line strips, and to independently compress each strip;
a single decompressor to decompress the color separation images, strip by strip, by interleaving the color separation images,
and to apply them to two or more print heads, one for each color separation image;
direct memory access from a main memory used to apply the color separation images to the single decompressor, wherein decompressor
output is demultiplexed into the two or more print heads, one of the print heads for each of the color separation images;
and
a page sync and a line sync from each of the print heads synchronize accessing of a correct image raster from the buffers
of the decompressor to each of the print heads, wherein
the single decompressor output drives the two or more print heads simultaneously in a single-pass color printer,
a multiplexing logic controls output from the direct memory access into the decompressor, and
the output of the single decompressor includes four separate buffers, each of the buffers corresponding to each of the color
separation images.
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