Device and method for encoding by principal component analysis a multichannel audio signal
First Claim
1. A method for coding by principal component analysis (PCA) of a multi-channel audio signal (C1, . . . ,CM), comprising the steps of:
- decomposing at least two channels (L, R) of said audio signal into a plurality of frequency sub-bands (I(b1), . . . I(bN), r(b1), . . . r(bN));
calculating a rotation angle (θ
(b1), . . . θ
(bN)) per sub-band among at least some of said plurality of frequency sub-bands, as at least one transformation parameter;
transforming at least some of said plurality of frequency sub-bands into a plurality of frequency sub-components using at least one of the calculated rotation angles (θ
(b1), . . . θ
(bN)), as the at least one transformation parameter, said plurality of frequency sub-components comprising principal frequency sub-components (CP(b1), . . . CP(bN));
combining at least some of said principal frequency sub-components (CP(b1), . . . CP(bN)) in order to form a principal component (CP); and
forming a coded audio signal (SC) representing said multi-channel audio signal (C1, . . . CM), said coded audio signal (SC) comprising said principal component (CP) and said at least one transformation parameter (θ
(b1), . . . θ
(bN)).
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Abstract
A system and a method for coding by principal component analysis (PCA) of a multi-channel audio signal comprising the following steps: decomposing at least two channels (L, R) of said audio signal into a plurality of frequency sub-bands (I(b1), . . . , I(bN), r(b1), . . . , r(bN)), calculating at least one transformation parameter (θ(b1), . . . , θ(bN)) as a function of at least some of said plurality of frequency sub-bands, transforming at least some of said plurality of frequency sub-bands into a plurality of frequency sub-components as a function of said at least one transformation parameter (θ(b1), . . . , θ(bN)), said plurality of frequency sub-components comprising principal frequency sub-components (CP(b1), . . . , CP(bN)), combining at least some of said principal frequency sub-components (CP(b1), . . . , CP(bN)) in order to form a principal component (CP), and defining a coded audio signal (SC) representing said multi-channel audio signal (C1, . . . , CM), said coded audio signal (SC) comprising said principal component (CP) and said at least one transformation parameter (θ(b1), . . . , θ(bN)).
17 Citations
24 Claims
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1. A method for coding by principal component analysis (PCA) of a multi-channel audio signal (C1, . . . ,CM), comprising the steps of:
-
decomposing at least two channels (L, R) of said audio signal into a plurality of frequency sub-bands (I(b1), . . . I(bN), r(b1), . . . r(bN)); calculating a rotation angle (θ
(b1), . . . θ
(bN)) per sub-band among at least some of said plurality of frequency sub-bands, as at least one transformation parameter;transforming at least some of said plurality of frequency sub-bands into a plurality of frequency sub-components using at least one of the calculated rotation angles (θ
(b1), . . . θ
(bN)), as the at least one transformation parameter, said plurality of frequency sub-components comprising principal frequency sub-components (CP(b1), . . . CP(bN));combining at least some of said principal frequency sub-components (CP(b1), . . . CP(bN)) in order to form a principal component (CP); and forming a coded audio signal (SC) representing said multi-channel audio signal (C1, . . . CM), said coded audio signal (SC) comprising said principal component (CP) and said at least one transformation parameter (θ
(b1), . . . θ
(bN)). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An encoder using principal component analysis (PCA) of a multi-channel audio signal (C1, . . . , CM), said encoder comprising:
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decomposition means for decomposing at least two channels (L, R) of said audio signal into a plurality of frequency sub-bands (I(b1), . . . , I(bN), r(b1, . . . r(bN)); calculation means for calculating a rotation angle (θ
(b1), . . . , θ
(bN)) per sub-band among at least some of said plurality of frequency sub-bands, as at least one transformation parameter;transformation means for transforming at least some of said plurality of frequency sub-bands into a plurality of frequency sub-components using at least one of the calculated rotation angles (θ
(b1), . . . , θ
(bN) as the at least one transformation parameter, said plurality of frequency sub-components comprising principal frequency sub-components (CP(b1), . . . , CP(bN));combination means for combining at least some of said principal frequency sub-components (CP(b1), . . . , CP(bN)) in order to form a principal component (CP) ; and formation means for forming a coded audio signal (SC) representing said multi-channel audio signal (C1, . . . , CM), said coded audio signal (SC) comprising said principal component (CP) and said at least one transformation parameter (θ
(b1), . . . , (θ
(bN)). - View Dependent Claims (23)
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24. A decoder of a received signal comprising a coded audio signal (SC) coming from an original multi-channel signal comprising at least two channels (L, R), wherein said decoder comprises:
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extraction means for extracting a decoded principal component (CP′
) and at least one decoded transformation parameter;decoding decomposition means for decomposing said decoded principal component (CP′
) into decoded principal frequency sub-components;inverse transformation means for transforming said decoded principal frequency sub-components (CP′
(b1), . . . , CP′
(bN)) into a plurality of decoded frequency sub-bands (I′
(b1), . . . , I′
(bN)) ; anddecoding combination means for combining said decoded frequency sub-bands in order to form at least two decoded channels (L′
, R′
) corresponding to said at least two channels (L, R) coming from said original multi-channel audio signal.
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Specification