Data compression system

Details Data compression system Data compression system

1982-02-26

1985-05-07

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

358261, 340347R, 375122, H04N 712

Patent

active

045162468

ABSTRACT:
A character base input data stream is encoded in compressed form by using a histogram of a sample of the data stream to determine the frequency of appearance of characters in the stream. A code for a character M+1 is generated in an encoder (112) to be of a length which is an inverse function of the frequency of appearance of character M+1 in the preceding M characters in the sample. Decoding can be achieved by forming a comparable sample window in a decoder (118) to which is applied an estimated index of the incoming character being decoded.

REFERENCES:
patent: 3560639 (1971-02-01), Centanni
patent: 4168513 (1979-09-01), Hains et al.
patent: 4228467 (1980-10-01), De Loyle et al.
Ismail et al., "Facsimile Compression Using a Classified Adaptive Block/Run-Length Coding Scheme", Conference NTC '80, IEEE National Telecommunications, Houston, TX, USA, Nov. 30-Dec. 4, 1980, p. 3638.
Usubuch et al., "Adaptive Predictive Coding for Newspaper Facsimile", Proceedings of IEEE, vol. 68, No. 7, Jul. 1980, pp. 807-813.

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