Abstract
An audio decoder for providing decoded audio information based on encoded audio information comprises an arithmetic decoder to provide a plurality of decoded spectral values based on an arithmetically encoded representation of the spectral coefficients. The audio decoder further comprises a frequency domain to time domain converter to provide a representation of time domain audio that uses decoded spectral values, to obtain the decoded audio information. The arithmetic decoder has a configuration that allows you to select a mapping standard that describes a mapping of a code value to a symbol code in a manner dependent on a numerical current contextual value that describes a current contextual state. The arithmetic decoder has a configuration that allows it to determine the current numerical contextual value in a manner dependent on a plurality of previously decoded spectral values. The arithmetic decoder has a configuration that allows you to evaluate at least one table that uses an iterative reduction of the interval size to determine if the current numerical contextual value is identical to a tabular contextual value described by an entry in the table or is within from an interval described by the entries in the table, and derive an index value from mapping standards that describes a selected mapping table. An audio encoder also applies an iterative reduction of the interval size.
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