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 encoded audio information includes an arithmetic decoder 2224 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-to-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 describing the mapping of the code value to the symbol code in dependence on the numerical current context value describing the current context state. The arithmetic decoder is configured to determine a numerical current context value depending on a plurality of previously decoded spectral values. The arithmetic decoder evaluates at least one table using iterative section size reduction and determines whether the numeric 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 to derive a mapping rule index value describing the selected mapping table. Audio encoders also use iterative section table size reduction.

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