Compression of multilevel signals

Details Compression of multilevel signals Compression of multilevel signals

1986-04-29

1988-06-07

Shoop, Jr., William M.

Communications: electrical

Audible indication

Percussion-type sound producer

H03M 730

Patent

active

047499834

ABSTRACT:
This invention relates to method and apparatus for compressing multilevel signals. The compression is based upon prediction errors and probability distributions. Compression is improved by conditioning the probability distributions using context of previous events. Storage required for storing the probability distributions is reduced by partitioning the prediction errors into predetermined ranges which become the coding events and contexts. Compression is made efficient with a partition which is a function of the sign and the number of significant bits in the prediction errors.

REFERENCES:
patent: 4467317 (1984-08-01), Langdon, Jr. et al.
"Compression of Black-White Images with Arithmetic Coding" by Rissanen and Langdon, IEEE Transactions on Communications, vol. COM-29, No. 6, Jun. 1981.
"Parameter Reduction and Context Selection for Compression of Gray-scale Images", by Todd et al., IBM J. Res. Develop., vol. 29, No. 2, Mar. 1985.
"Computer Design", by Langdon, Computeach Press, San Jose, California, 1982, pp. 489-491.
"An Introduction to Arithmetic Coding", IBM Journal of Research and Development, by Langdon, vol. 28, No. 2, pp. 135-149.

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