发明名称 |
Audio signal decoder, audio signal encoder, method for decoding an audio signal, method for encoding an audio signal and computer program using a pitch-dependent adaptation of a coding context |
摘要 |
An audio signal decoder (150 for providing a decoded audio signal representation (154) on the basis of an encoded audio signal representation (152) comprising an encoded spectrum representation (ac_spectral_data[]) and an encoded time warp information (tw_data[]) comprises a context-based spectral value decoder (160) configured to decode a codeword (acod_m) describing one or more spectral values or at least a portion (m) of a number representation of one or more spectral values in dependence on a context state, to obtain decoded spectral values (162, 297, x_ac_dec[]). The audio signal decoder also comprises a context state determinator (170) configured to determine a current context state (164, c) in dependence on one or more previously decoded spectral values (162, 297). The audio signal decoder also comprises a time warping frequency-domain-to-time-domain converter (180) configured to provide a time-warped time-domain representation (182) of a given audio frame on the basis of a set of decoded spectral values (162) associated with the given audio frame and provided by the context-based spectral value decoder and in dependence on the time warp information. The context-state determinator (170) is configured to adapt the determination of the context state to a change of a fundamental frequency between subsequent audio frames. An audio signal encoder applies a comparable concept. |
申请公布号 |
AU2011226143(A1) |
申请公布日期 |
2012.10.25 |
申请号 |
AU20110226143 |
申请日期 |
2011.03.09 |
申请人 |
FRAUNHOFER-GESELLSCHAFT ZUR FORDERUNG DER ANGEWANDTEN FORSCHUNG E.V.;DOLBY INTERNATIONAL AB |
发明人 |
BAYER, STEFAN;BACKSTROM, TOM;GEIGER, RALF;EDLER, BERND;DISCH, SASCHA;VILLEMOES, LARS |
分类号 |
G10L21/04;G10L19/02;G10L19/022;G10L25/90 |
主分类号 |
G10L21/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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