Circuit for compacting variable length into fixed word...

Details Circuit for compacting variable length into fixed word... Circuit for compacting variable length into fixed word...

H - Electricity

04

N

354/68, 350/70

H04N 1/41 (2006.01) H03M 7/42 (2006.01)

Patent

CA 1156764

CIRCUIT FOR COMPACTING DATA ABSTRACT OF THE INVENTION A circuit for compacting variable length data words into a fixed word length format is disclosed. Each variable length data word and its associated leading O's are separated by a delimiter bit and stored in memory. When the memory is accessed, the output word is loaded in parallel into a first shift register and shifted to strip the leading O's and delimiter bit. Theremaining data bits are then shifted serially into a second shift register. When the second shift register is full, the resultant fixed length data word is latched out. When the first shift register is empty, the next word is loaded in from memory. In this way, a series of variable length data words may be compacted into a series of fixed length words. The circuit is useful for compacting variable length Huffman codes since the boundaries between codes are self evident. This circuit can also be used as a character gener- ator, where the variable length data output comprises the bits required to generate a character image on a raster scanned display.

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