Device and Method for Graduated Encoding of a Multichannel Audio Signal Based on a Principal Component Analysis
First Claim
1. A scalable coding method of a multi-channel audio signal (C1, . . . , CM), comprising a principal component analysis (PCA) transformation of at least two channels (L, R) of the said audio signal into a principal component (CP) and at least one residual sub-component (r) by rotation defined by a transformation parameter (θ
- ), wherein the method comprises the steps of;
forming a frequency subband-based residual structure (Sfr) on the basis of the at least one residual sub-component (r); and
defining a coded audio signal (SC) comprising the principal component (CP), at least one residual structure (Sfr) of a frequency subband and the sad transformation parameter (θ
).
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Abstract
A system and a method for the scalable coding of a multi-channel audio signal comprising a principal component analysis (PCA) transformation of at least two channels (L, R) of the audio signal into a principal component (CP) and at least one residual sub-component (r) by rotation defined by a transformation parameter (θ), comprising the following steps: formation of a frequency subband-based residual structure (Sfr) on the basis of the at least one residual sub-component (r), and definition of a coded audio signal (SC) comprising the principal component (CP), at least one residual structure (Sfr) of a frequency subband and the transformation parameter (θ).
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Citations
21 Claims
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1. A scalable coding method of a multi-channel audio signal (C1, . . . , CM), comprising a principal component analysis (PCA) transformation of at least two channels (L, R) of the said audio signal into a principal component (CP) and at least one residual sub-component (r) by rotation defined by a transformation parameter (θ
- ), wherein the method comprises the steps of;
forming a frequency subband-based residual structure (Sfr) on the basis of the at least one residual sub-component (r); and defining a coded audio signal (SC) comprising the principal component (CP), at least one residual structure (Sfr) of a frequency subband and the sad transformation parameter (θ
). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19, 20, 21)
- ), wherein the method comprises the steps of;
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17. A scalable encoder of a multi-channel audio signal (C1, . . . , CM), comprising transformation means (28) based on principal component analysis (PCA) transforming at least two channels (L, R) of the audio signal into a principal component (CP) and at least one residual sub-component (r) by rotation defined by a transformation parameter (θ
- , θ
(bi)), wherein the encoder comprises;structure formation means (30) for forming a frequency subband-based residual structure (Sfr) on the basis of the at least one residual sub-component (r); and defining means (29) for defining a coded audio signal (SC) comprising the principal component (CP), at least one residual structure (Sfr) of a frequency subband and the transformation parameter (θ
).
- , θ
Specification