Method and apparatus for compression and decompression of data

Details Method and apparatus for compression and decompression of data Method and apparatus for compression and decompression of data

1993-01-11

1993-10-19

Hoff, Marc S.

Coded data generation or conversion

Digital code to digital code converters

Adaptive coding

341 87, H03M 730

Patent

active

052549909

ABSTRACT:
In a data compressing and decompressing apparatus, having improved efficiency and enhanced compression ratio whereby character sequence of received data is coded and decoded by referring to a dictionary related to the last character of the immediately preceding character sequence, and a character sequence which is one character extended character sequence of the coded and decompressed character sequence is registered in the dictionary in relation with the last character of the immediately preceding character sequence so that the compression ratio of the coding of data is increased.

REFERENCES:
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patent: 4876541 (1989-10-01), Storer
patent: 4881075 (1989-11-01), Weng
patent: 4899148 (1990-02-01), Sato et al.
patent: 5027376 (1991-06-01), Friedman et al.
BIT, vol. 25, No. 4, 1985, pp. 593-603; Jakobsson, M. "Compression of Character Strings by an Adaptive Dictionary".
European Search Report dated Oct. 30, 1992.

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