U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Probability adaptation for arithmetic coders

Patent 4935882 Issued on June 19, 1990. Estimated Expiration Date: Icon_subject July 20, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

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Inventors

Application

No. 222332 filed on 07/20/1988

US Classes:

702/181Probability determination

Examiners

Primary: Gruber, Felix D.

Attorney, Agent or Firm

International Classes

G06F 015/36
G06F 007/10

Abstract

Apparatus and method for adapting the estimated probability of either the less likely or more likely outcome (event) of a binary decision in a sequence of binary decisions involves the up-dating of the estimated probability in response to the renormalization of an augend A. The augend A changes value with each binary decision, the size of the change depending on which of the binary events has occurred as input. Re-normalization of A occurs when the A value becomes less than a prescribed minimum value AMIN. According to the invention, there may be differing contexts in which binary decisions may occur, each context having a corresponding estimated probability value which is up-dated with binary decisions in the respective context. Also according to the invention, there may be one or more possible next values for an estimated probability in response to a given binary decision event. The selection of one of multiple possible next values in response to a given binary decision event is preferably determined based on a renormalization correlation count.

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