Adaptive data compression system

Details Adaptive data compression system Adaptive data compression system

1991-12-09

1994-06-07

Chin, Stephen

Pulse or digital communications

Spread spectrum

Direct sequence

375121, H04B 166, H04L 2300

Patent

active

053196821

ABSTRACT:
An adaptive data compression system comprises an encoder 2 which responds to input characters by producing output codewords according to a stored encoding map or table of characters and codewords, and an adapter 4, 5 which adapts the encoding map or table in accordance with the input characters so as to increase the compression ratio between the input characters and output codewords. An optimizer 5 monitors the performance of the system and accordingly varies adaptation of the encoding map or table by the adapter 4 so as to optimize performance of the system. Performance of the system is preferably monitored in terms of the computational loading of the processor and the compression ratio it achieves. A decoder 7 subsequently decodes the codewords by reference to a corresponding decoding map or table which is adapted 9, 10 in accordance with the output data from the decoder and in accordance with variations in the adaptation process in the encoder.

REFERENCES:
patent: 4560977 (1983-06-01), Murakami et al.
patent: 5086439 (1992-02-01), Asai et al.
patent: 5172228 (1992-12-01), Israelson

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