Abstract
An audio decoder (200; 800; 2200) for providing decoded audio information (212; 812; 2212) based on an encoded audio information (210; 810; 2210), an audio encoder comprising: a decoder arithmetic (230; 820; 2220) to provide a plurality of decoded spectral values (232; 822; 2224; a) based on an arithmetically encoded representation (222; 821; 2222; acod_m (pki) (m), acod_r ( r)) of the spectral values; and a frequency domain to temporary domain converter (260; 830; 2230) to provide a temporary domain audio representation using the decoded spectral values (232; 822; 2224; a), to obtain the decoded audio information; where the arithmetic decoder has a configuration that allows you to select a mapping standard (cum_freq, ari_cf_m (pki) (9)) that describes a mapping of a code value (acod_m (pki) (m); value) to a code symbols (symbol) dependent on a contextual state; where the arithmetic decoder has a configuration that allows it to determine a numerical current contextual value (s) that describes the current contextual state in a manner dependent on a plurality of previously decoded spectral values (a) and also in a manner dependent on a spectral value ( a) to be decoded either in a first predetermined frequency region or in a second predetermined frequency region.
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