Communications: electrical – Audible indication – Percussion-type sound producer
Patent
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.
Blum Richard K.
International Business Machines - Corporation
Lee Simon K.
Shoop Jr. William M.
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