Source: http://www.google.com/patents/US8190425?dq=6335678
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Patent US8190425 - Complex cross-correlation parameters for multi-channel audio - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsAn audio encoder encodes a combined channel (e.g., a sum channel) for a group of plural physical audio channels. The encoder determines plural parameters for representing individual physical channels of the group as modified versions of the encoded combined channel. The plural parameters comprise ratios...http://www.google.com/patents/US8190425?utm_source=gb-gplus-sharePatent US8190425 - Complex cross-correlation parameters for multi-channel audioAdvanced Patent SearchPublication numberUS8190425 B2Publication typeGrantApplication numberUS 11/336,403Publication dateMay 29, 2012Filing dateJan 20, 2006Priority dateJan 20, 2006Also published asUS20070172071Publication number11336403, 336403, US 8190425 B2, US 8190425B2, US-B2-8190425, US8190425 B2, US8190425B2InventorsSanjeev Mehrotra, Wei-ge ChenOriginal AssigneeMicrosoft CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (109), Non-Patent Citations (109), Referenced by (5), Classifications (4), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetComplex cross-correlation parameters for multi-channel audioUS 8190425 B2Abstract An audio encoder encodes a combined channel (e.g., a sum channel) for a group of plural physical audio channels. The encoder determines plural parameters for representing individual physical channels of the group as modified versions of the encoded combined channel. The plural parameters comprise ratios of power in each individual channel to power in the combined channel (e.g., a ratio of the power of a right channel to the power of the combined channel, and a ratio of the power of the left channel to the power of the combined channel). The plural parameters can include a complex parameter. The combined channel and the plural parameters facilitate reconstruction at the audio decoder of source channels. An audio decoder performs a forward complex transform on the multi-channel audio data and reconstructs plural channels from the multi-channel audio data. The decoder can maintain second-order statistics for the source channels.
U ⁡ ( Λ α ) 1 / 2 = [ a ⁢ ⁢ C 0 b ⁢ ⁢ C 0 c ⁢ ⁢ C 1 d ⁢ ⁢ C 1 ] , and assume W0F and W1F have the same power as and are uncorrelated to W0 and W1 respectively, the reconstruction procedure in FIGS. 23 or 22 produces the desired correlation matrix for the final output. In practice, the encoder sends power ratios |C0| and |C 1|, and the imaginary-to-real ratio Im(X0X1* )/α. The decoder can reconstruct a normalized version of the cross correlation matrix (as shown in FIG. 25). The decoder can then calculate θ and find Eigenvalues and Eigenvectors, arriving at the desired transform.
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