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 (1(b1), . . . , 1(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)).
1 Assignment
0 Petitions
Accused Products
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 (1(b1), . . . , 1(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)).
-
Citations
24 Claims
-
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 (1(b1), . . . , 1(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)). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 23, 24)
-
-
20. An encoder (9) using principal component analysis (PCA) of a multi-channel audio signal (C1, . . . ,CM), said encoder (9) comprising:
-
decomposition means (21) for decomposing at least two channels (L, R) of said audio signal into a plurality of frequency sub-bands (1(b1), . . . , 1(bN), r(b1), . . . , r(bN)); calculation means (23) for calculating at least one transformation parameter (θ
(b1), . . . , θ
(bN)) as a function of at least some of said plurality of frequency sub-bands;transformation means (25) for 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));combination means (27) for combining at least some of said principal frequency sub-components (CP(b1), . . . , CP(bN)) in order to form a principal component (CP); and definition means (29) for 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)). - View Dependent Claims (22)
-
-
21. A decoder (15) 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 (15) comprises:
-
extraction means (41) for extracting a decoded principal component (CP′
) and at least one decoded transformation parameter;decoding decomposition means (43) for decomposing said decoded principal component (CP′
) into decoded principal frequency sub-components;inverse transformation means (47) for transforming said decoded principal frequency sub-components (CP′
(b1), . . . , CP′
(bN)) into a plurality of decoded frequency sub-bands (1′
(b1), . . . ,I′
(bN)); anddecoding combination means (49) 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.
-
Specification