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Audio Encoder, Audio Decoder, Method for Encoding an Audio Information, Method for Decoding an Audio Information and Computer Program Using a Detection of a Group of Previously-Decoded Spectral Values

 
: Fuchs, G.; Subbaraman, V.; Rettelbach, N.; Multrus, M.; Gayer, M.; Warmbold, P.; Griebel, C.; Weiss, O.

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Frontpage ()

US 20090253459 P: 20091020
WO 2010EP65725 A: 20101019
WO 2011048098 A1: 20110428
English
Patent, Electronic Publication
Fraunhofer IIS ()

Abstract
An audio decoder (200) for providing a decoded audio information (212) on the basis of an encoded audio information (210) comprises a arithmetic decoder (230) for providing a plurality of decoded spectral values (232) on the basis of an arithmetically-encoded representation (222) of the spectral values and a frequency-domain-to-time-domain converter (260) for providing a time-domain audio representation (262) using the decoded spectral values, in order to obtain the decoded audio information. The arithmetic decoder (230) is configured to select a mapping rule describing a mapping of a code value onto a symbol code in dependence on a context state. The arithmetic decoder is configured to determine or modify the current context state in dependence on a plurality of previously-decoded spectral values. The arithmetic decoder is configured to detect a group of a plurality of previously-decoded spectral values, which fulfill, individually or taken together, a predetermined condition regarding their magnitudes, and to determine the current context state in dependence on a result of the detection. An audio encoder uses similar principles.

: http://publica.fraunhofer.de/documents/N-201665.html