Look ahead for high speed CCITT decompressor

Details Look ahead for high speed CCITT decompressor Look ahead for high speed CCITT decompressor

1990-12-24

1993-04-27

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 1419

Patent

active

052067343

ABSTRACT:
A new and improved decoder for decoding CCITT compressed image data. This decoder separates all the incoming codes into short codes and long codes. The short codes are sent to the short channel decoder and the long codes are sent to the Long Channel decoder. The short channel decoder has a twin set decoder which decodes two short codes in parallel and guarantees two bits of decompressed data per clock cycle. The Long Channel decoder decodes the long codes which always generate at least four bits of decompressed data. A look ahead logic determines the a0b1 and a0b2 relative distances for each of the next two codes to be decoded on the next clock cycle, while the current codes are in the process of decoding. The look ahead logic helps to increase the decoding speed.

REFERENCES:
patent: 4245257 (1981-01-01), Yamazaki et al.
patent: 4562484 (1985-12-01), Rallapalli et al.
patent: 4626921 (1986-12-01), Ohtani et al.
patent: 4839738 (1989-06-01), Kaku et al.
patent: 4968135 (1990-11-01), Wallace et al.

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