AUDIO ENCODER, AUDIO DECODER, METHOD FOR ENCODING AN AUDIO INFORMATION, METHOD FOR DECODING AN AUDIO INFORMATION AND COMPUTER PROGRAM USING A REGION-DEPENDENT ARITHMETIC CODING MAPPING RULE
摘要
<p>An audio decoder (2200) for providing a decoded audio information (2212) on the basis of an encoded audio information (2210) comprises an arithmetic decoder (2220) for providing a plurality of decoded spectral values (2224) on the basis of an arithmetically-encoded representation (2222) of the spectral values and a frequency-domain-to-time-domain converter (2230) for providing a time-domain audio representation using decoded spectral values (2224), in order to obtain the decoded audio information. The arithmetic decoder 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 a numeric current context value describing the current context state in dependence on a plurality of previously decoded spectral values and also in dependence on whether a spectral value to be decoded is in a first predetermined frequency region or in a second predetermined frequency region. An audio encoder provides an encoded audio information on the basis of an input audio information.</p>
申请公布号
CA2778325(A1)
申请公布日期
2011.04.28
申请号
CA20102778325
申请日期
2010.10.19
申请人
FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
发明人
FUCHS, GUILLAUME;SUBBARAMAN, VIGNESH;RETTELBACH, NIKOLAUS;MULTRUS, MARKUS;GAYER, MARC;WARMBOLD, PATRICK;GRIEBEL, CHRISTIAN;WEISS, OLIVER