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Title
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
Date Issued
2011
Author(s)
Fuchs, G.
Subbaraman, V.
Rettelbach, N.
Multrus, M.
Gayer, M.
Warmbold, P.
Griebel, C.
Weiss, O.
Patent No
20090253459
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.
Language
en
Patenprio
US 20090253459 P: 20091020