Source: http://www.google.com/patents/US8190425?dq=inventor:%22Arthur+R.+Hair%22&ei=VAy0Tsa4NYTl0QGQiqWiBA
Timestamp: 2017-12-17 23:54:58
Document Index: 795476435

Matched Legal Cases: ['art 7', 'art 7', 'art 7', 'art 7', 'Application No. 03', 'Application No. 03']

Patent US8190425 - Complex cross-correlation parameters for multi-channel audio - Google Patents
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...http://www.google.com/patents/US8190425?utm_source=gb-gplus-sharePatent US8190425 - Complex cross-correlation parameters for multi-channel audio
Publication number US8190425 B2
Application number US 11/336,403
Also published as US20070172071
Publication number 11336403, 336403, US 8190425 B2, US 8190425B2, US-B2-8190425, US8190425 B2, US8190425B2
Patent Citations (126), Non-Patent Citations (109), Referenced by (15), Classifications (4), Legal Events (3)
Complex cross-correlation parameters for multi-channel audio
US 8190425 B2
28. The method of claim 27 wherein the ratios of power are determined on a per-band basis.
Surround sound audio typically has even higher raw bitrate.
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.
1) For each band, the frequency encoder computes the energy of the previously (by base coding eg) compressed signal—E1.
2) For each band, the frequency encoder computes the energy of the original signal—E2.
3) If (E2−E1)>T, where T is a predefined threshold, the frequency encoder marks this band as the starting point.
4) The frequency encoder starts the operation here, and
5) The frequency encoder transmits the starting point to the decoder.
In the example shown in FIG. 41, audio blocks 4100 and 4110 comprise N sub-bands in the range 0 to N−1, with the sub-bands in each block partitioned into a lower-frequency baseband and a higher-frequency extended band. For audio block 4100, the displacement vector d0 is shown to be the displacement between sub-bands m0 and n0. Similarly, for audio block 4110, the displacement vector d1, is shown to be the displacement between sub-bands m1 and n1
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U.S. Classification 704/203
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