Abstract
An audio decoder (200; 800; 2200) for providing decoded audio information (212; 812) based on encoded audio information (210; 810), audio decoder comprising: an arithmetic decoder (230; 820; 2220) to provide a plurality of decoded spectral values (232; 822; 2224) based on an arithmetically encoded representation (222; 821; 2222) of the spectral values; and a frequency domain to temporary domain converter (260; 830; 2230) to provide a temporary domain audio representation (262; 812; 2212) using decoded spectral values (232; 822; 2224), to obtain the information of decoded audio (212; 812; 2212); where the arithmetic decoder (230; 820; 2220) is configured to select a mapping standard (297; cum_freq ()) that describes a mapping of a code value (value) of the arithmetically encoded representation of the spectral values to a code of symbols (symbol) representing one or more of the decoded spectral values, or at least a portion of one or more of the decoded spectral values, in a manner dependent on a numerical current contextual value (s) describing a current contextual state, where the arithmetic decoder is configured to determine the current numerical contextual value (s) in a manner dependent on a plurality of previously decoded spectral values (a); where the arithmetic decoder is configured to evaluate at least one table (ari_s_hash (387); ari_gs_hash (225)) using an iterative reduction of the interval size (542; 546), to determine whether the current numerical contextual value (s) is identical to a tabular contextual value described by an entry (j, ari_s_hash (i), ari_gs_hash (i)) of the table or is within a range described by the entries in the table, and to derive a norm index value Mapping (pki) that describes a selected mapping standard (arith_cf_m (pki) (9)).
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| 4G,3G | 06/03/2016 | ISLD-201512-009 | FRAUNHOFER SOCIETY | No | Family Member | ||||
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