Data compression method and apparatus with optimized transitions

Details Data compression method and apparatus with optimized transitions Data compression method and apparatus with optimized transitions

1995-05-08

1997-11-11

Gaffin, Jeffrey A.

Coded data generation or conversion

Digital code to digital code converters

Adaptive coding

341 87, 341106, H03M 734

Patent

active

056869126

ABSTRACT:
A method of compressing a stream of raw data including the steps of providing a memory device having compression active state and a compression inactive state, inputting a raw data segment into the memory device, generating a compressed data segment based on the raw data segment, creating output data based on the compressed data segment when the memory device is in the compression active state, otherwise based on the raw data segment when in the memory device is the compression inactive state, calculating a compression coefficient, and setting the state of the memory device based on the compression coefficient, such that compressed data is output only when compression has recently proven effective, and raw data is output when compression has recently proven ineffective. The method may also include decompression of the output data.

REFERENCES:
patent: 4509038 (1985-04-01), Hirano
patent: 4558302 (1985-12-01), Welch
patent: 4847619 (1989-07-01), Kato et al.
patent: 4870415 (1989-09-01), Van Maren et al.
patent: 5175543 (1992-12-01), Lantz
patent: 5177480 (1993-01-01), Clark
patent: 5373290 (1994-12-01), Lempel et al.
"Compression of Individual Sequences via Variable-Rate Coding" pp. 530-536, Jacob Ziv, and Abraham Lempel, IEEE Transactions on Information Therory, vol. IT-24, No. 5, Sep. 1978.

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