Abstract
Audio decoder (200; 800) to provide decoded audio information (212; 812) based on encoded audio information (210; 810), comprising: an arithmetic decoder (230; 820) to provide a plurality of decoded spectral values (232; 822) based on an arithmetically encoded representation (222; 821) of the spectral values; and a frequency domain to temporary domain converter (260; 830) to provide a temporary domain audio representation (262; 812) that uses decoded spectral values (232; 822), to obtain decoded audio information (212; 812); wherein the arithmetic decoder (230; 820) is configured to select a mapping standard (297; cum_freq ()) that describes a mapping of a code value of the arithmetically encoded representation to a symbol code (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 contextual state (s); and wherein the arithmetic decoder (230; 820) is configured to determine the current contextual state (s) in a manner dependent on a plurality of previously decoded spectral values, wherein the arithmetic decoder is configured to detect a group of the plurality of values previously decoded spectra that satisfy, considered individually or together, a predetermined condition related to their magnitudes, and to determine or modify the current contextual state (s) in a manner dependent on a result obtained with the detection.
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| 4G,3G | 06/03/2016 | ISLD-201512-009 | FRAUNHOFER SOCIETY | No | Family Member | ||||
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