AUDIO ENCODER AUDIO DECODER METHOD FOR ENCODING AN AUDIO INFORMATION METHOD FOR DECODING AN AUDIO INFORMATION AND COMPUTER PROGRAM USING AN ITERATIVE INTERVAL SIZE REDUCTION

Abstract

An audio decoder 2200 for providing decoded audio information based on the encoded audio information is an arithmetic decoder for providing a plurality of decoded spectral values 2224 based on an arithmetically encoded representation 2222 of spectral coefficients. 2200. The audio decoder also includes a frequency domain-time domain converter 2230 for providing a time domain audio representation using the decoded spectral values 2224 to obtain decoded audio information 2212. The arithmetic decoder is configured to select a mapping rule that describes the mapping of code values to symbol codes depending on the numerical current context values describing the current context state. The arithmetic decoder is configured to determine the numerical current context value depending on the plurality of previously decoded spectral values. The arithmetic decoder uses an iterative interval size reduction to evaluate at least one table, and whether the numerical current context value is equal to the table context value described by the entry of the table or lies within the interval described by the entries of the table. And determine a mapping rule index value describing the selected mapping table. The audio encoder also uses repeat interval table size reduction.

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