Source: http://www.google.com/patents/US7660424?dq=5579430
Timestamp: 2017-07-25 11:52:03
Document Index: 481071910

Matched Legal Cases: ['Application No. 03', 'Application No. 03', 'Application No. 03', 'Application No. 20050055704', 'Application No. 01017', 'Application No. 2002', 'Application No. 01017', 'Application No. 2002', 'Application No. 02804662']

Patent US7660424 - Audio channel spatial translation - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsUsing an M:N variable matrix, M audio input signals, each associated with a direction, are translated to N audio output signals, each associated with a direction, wherein N is larger than M, M is two or more and N is a positive integer equal to three or more. The variable matrix is controlled in response...http://www.google.com/patents/US7660424?utm_source=gb-gplus-sharePatent US7660424 - Audio channel spatial translationAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS7660424 B2Publication typeGrantApplication numberUS 10/522,515PCT numberPCT/US2003/024570Publication dateFeb 9, 2010Filing dateAug 6, 2003Priority dateFeb 7, 2001Fee statusPaidAlso published asUS20050276420, US20090208023Publication number10522515, 522515, PCT/2003/24570, PCT/US/2003/024570, PCT/US/2003/24570, PCT/US/3/024570, PCT/US/3/24570, PCT/US2003/024570, PCT/US2003/24570, PCT/US2003024570, PCT/US200324570, PCT/US3/024570, PCT/US3/24570, PCT/US3024570, PCT/US324570, US 7660424 B2, US 7660424B2, US-B2-7660424, US7660424 B2, US7660424B2InventorsMark Franklin DavisOriginal AssigneeDolby Laboratories Licensing CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (38), Non-Patent Citations (32), Referenced by (39), Classifications (11), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetAudio channel spatial translation
US 7660424 B2Abstract
Lout coeffs=cos (0), sin (0)=(1, 0) MidLout coeffs=cos (22.5), sin (22.5)=(0.92, 0.38) Cout coeffs=cos (45), sin (45)=(0.71, 0.71) MidRout coeffs=cos (67.5, sin (67.5)=(0.38, 0.92) Rout coeffs=cos (90), sin (90)=(0, 1) Thus, for the case of a matrix with fixed coefficients and a variable gain controlled by a scale factor at each matrix output, the signal output at each of the five output channels is (where “SF” is a scale factor for a particular output identified by the subscript):
RMS Energy ( A ) = ∫ A 2 ∂ t = A 2 _ = ( .707 X + Y ) 2 _ = ( 0.5 X 2 + 0.707 XY + Y 2 ) _ = 0.5 X 2 _ + 0.707 XY _ + Y 2 _ Because X and Y are uncorrelated,
(where “abs” indicates taking the absolute value). Normalizing the latter two numbers to sum-square to 1.0 yields values of 0.8678 and 0.4969 respectively. Thus, switching these values to the opposite channels, the dominant scale factor components are (note that the value of the dominant scale factor, prior to direction weighting, is the square root of effective_xcor):
(the dominant signal is closer to Cout than MidLout). The use of one channel's antidom component, normalized, as the other channel's dominant scale factor component may be better understood by considering what happens if the nominal ongoing primary direction happens to point exactly at one of the two chosen channels. Suppose that one channel's coefficients are [A, B] and the other channel's coefficients are [C, D] and the nominal ongoing primary direction coordinates are [A, B] (pointing to the first channel), then:
where “sqrt( )” means “square13 root of ( )” For a two-input module with 4 outputs:
First, within a particular module's preliminary scale factor calculations, the endpoints are possible candidates for dominant signal scale factor components by block 355 (and normalizer 361). Second, in the “fill” calculation of block 357 (and normalizer 363) of FIG. 4C, the endpoints are treated as possible fill candidates, along with all the interior channels. Any non-zero fill scale factor component may be applied to all outputs, even the endpoints and the chosen dominant outputs. Third, if there is a lattice of multiple modules, a supervisor (such as supervisor 201 of the FIG. 2 example) performs a final, fourth, assignment of the “endpoint” channels, as described above in connection with FIGS. 2 and 3. In order for block 459 to calculate the “excess endpoint energy” scale factor components, the total energy at all interior outputs is reflected back to the module's inputs, based on neighbor-compensated_xcor, to estimate how much of the energy of interior outputs is contributed by each input (“interior energy at input ‘n’”), and that energy is used to compute the excess endpoint energy scale factor component at each module output that is coincident with an input (i.e., an endpoint).
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INTEREST;ASSIGNOR:DAVIS, MARK FRANKLIN;REEL/FRAME:016820/0418Effective date: 20050125Owner name: DOLBY LABORATORIES LICENSING CORPORAITON,CALIFORNIFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:DAVIS, MARK FRANKLIN;REEL/FRAME:016820/0418Effective date: 20050125Nov 30, 2010CCCertificate of correctionMar 14, 2013FPAYFee paymentYear of fee payment: 4RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services