Arithmetic decoding apparatus

Details Arithmetic decoding apparatus Arithmetic decoding apparatus

2009-02-27

2010-10-26

Williams, Howard (Department: 2819)

Coded data generation or conversion

Digital code to digital code converters

To or from code based on probability

Reexamination Certificate

active

07821430

ABSTRACT:
Disclosed herein is an arithmetic decoding apparatus that decodes encoded data while updating first and second state variables based on first and second context variables. The first context variable represents a probability state. The second context variable represents a most probable symbol. The arithmetic decoding apparatus includes: a decoding information table that stores transitions of a range of the most probable symbol and a range of a least probable symbol within a range identified by the first context variable, and a number of a symbol for which the range of the most probable symbol becomes less than a specific value; a number-of-symbols determination section configured to determine the number of symbols in the encoded data that are to be decoded collectively; and an output section configured to decode and output a symbol corresponding to the number of symbols that are to be decoded collectively.

REFERENCES:
patent: 5025258 (1991-06-01), Duttweiler
patent: 5774081 (1998-06-01), Cheng et al.
patent: 6864813 (2005-03-01), Horie
patent: 7262722 (2007-08-01), Jahanghir et al.
patent: 7304590 (2007-12-01), Park
patent: 2005/0088324 (2005-04-01), Fuchigami et al.

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