Data compression method and apparatus

Details Data compression method and apparatus Data compression method and apparatus

1996-08-26

1998-12-15

Beausoliel, Jr., Robert W.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Plural load device systems

395888, 395309, G06F 1134

Patent

active

058505652

ABSTRACT:
A data compressor scans one or more data files to locate variable-length strings of characters (data) that can be more efficiently compressed by delta compression (i.e. by referring to a string in an earlier version of the data file) than by traditional compression (i.e. by referring to a string of characters that occurs earlier in the data file). The compressor employs a criterion to select the strings that are likely to be most amenable to delta compression, i.e. to provide the highest overall compression ratio. The compressor creates a dictionary that describes the selected strings, which can then be advantageously used to delta-compress edited (changed) versions of the data files for transmission to another computer. In addition, a "dual-mode" data compressor employs a combination of delta and traditional compression to efficiently compress data and send one or more files from a sending computer to a receiving computer, where a decompressor reconstitutes a copy of the files. As the dual-mode compressor processes the files, it creates a dictionary.

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patent: 5598543 (1997-01-01), Notarianni et al.

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