Source: http://www.google.com/patents/US7729790?dq=552685
Timestamp: 2014-09-30 18:15:48
Document Index: 759549545

Matched Legal Cases: ['Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60']

Patent US7729790 - Phase alignment of audio output data in a multi-channel configuration - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsSystems and methods for ensuring proper phase alignment of audio signals which are processed by separate hardware channels in an audio amplification system. In one embodiment, the phase alignment is controlled by determining the number of audio data samples which are stored in the input buffers of multiple...http://www.google.com/patents/US7729790?utm_source=gb-gplus-sharePatent US7729790 - Phase alignment of audio output data in a multi-channel configurationAdvanced Patent SearchPublication numberUS7729790 B1Publication typeGrantApplication numberUS 10/805,590Publication dateJun 1, 2010Filing dateMar 19, 2004Priority dateMar 21, 2003Publication number10805590, 805590, US 7729790 B1, US 7729790B1, US-B1-7729790, US7729790 B1, US7729790B1InventorsLarry E. Hand, Jack B. Andersen, Daniel L. W. Chieng, Michael A. Kost, Wilson E. TaylorOriginal AssigneeD2Audio CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (11), Classifications (10), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetPhase alignment of audio output data in a multi-channel configurationUS 7729790 B1Abstract Systems and methods for ensuring proper phase alignment of audio signals which are processed by separate hardware channels in an audio amplification system. In one embodiment, the phase alignment is controlled by determining the number of audio data samples which are stored in the input buffers of multiple audio amplification units and controlling reads from the input buffers to minimize the difference between an actual read-write pointer differential and a target differential. In a master unit, the target differential is a predetermined target value corresponding to a desired delay in the buffer. The actual pointer differential of the master unit is passed to one or more slave units. The actual pointer differential of the master unit is used as the target differential of the slave units. The pointer differentials of the slave units are thereby driven to track the pointer differential of the master unit, keeping the units synchronized.
RELATED APPLICATIONS This application claims priority to U.S. Provisional Patent Application No. 60/469,774, entitled �Phase Alignment of Output Audio in a Multi-SRC Configuration,� by Hand, et al., filed May 12, 2003; U.S. Provisional Patent Application No. 60/456,414, entitled �Adaptive Anti-Clipping Protection,� by Taylor, et al., filed Mar. 21, 2003; U.S. Provisional Patent Application No. 60/456,430, entitled �Frequency Response Correction,� by Taylor, et al., filed Mar. 21, 2003; U.S. Provisional Patent Application No. 60/456,429, entitled �High-Efficiency, High-Performance Sample Rate Converter,� by Andersen, et al., filed Mar. 21, 2003; U.S. Provisional Patent Application No. 60/456,421, entitled �Output Device Switch Timing Correction,� by Taylor, et al., filed Mar. 21, 2003; U.S. Provisional Patent Application No. 60/456,422, entitled �Output Filter, Phase/Timing Correction,� by Taylor, et al., filed Mar. 21, 2003; U.S. Provisional Patent Application No. 60/456,428, entitled �Output Filter Speaker/Load Compensation,� by Taylor, et al., filed Mar. 21, 2003; U.S. Provisional Patent Application No. 60/456,420, entitled �Output Stage Channel Timing Calibration,� by Taylor, et al., filed Mar. 21, 2003; U.S. Provisional Patent Application No. 60/456,427, entitled �Intelligent Over-Current, Over-Load Protection,� by Hand, et al., filed Mar. 21, 2003; each of which is fully incorporated by reference as if set forth herein in its entirety.
SUMMARY OF THE INVENTION One or more of the problems outlined above may be solved by the various embodiments of the invention. Broadly speaking, the invention comprises systems and methods for ensuring proper phase alignment of audio signals which are processed by separate hardware channels in an audio amplification system. The phase alignment is controlled by determining the number of audio data samples which are stored in the input buffers of multiple audio amplification units and controlling reads from the input buffers to minimize the difference between an actual read-write pointer differential and a target differential. In a master unit, the target differential is a predetermined target value corresponding to a desired delay in the buffer. In one or more slave units, the target differential is the actual pointer differential of the master unit. The pointer differentials of the slave units are thereby driven to track the pointer differential of the master unit, keeping the units synchronized.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS One or more embodiments of the invention are described below. It should be noted that these and any other embodiments described below are exemplary and are intended to be illustrative of the invention rather than limiting.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS5390180 *Feb 16, 1994Feb 14, 1995Nec America, Inc.SONET DS-N desynchronizerUS5778218 *Dec 19, 1996Jul 7, 1998Advanced Micro Devices, Inc.Computer systemUS5918073 *Jun 27, 1997Jun 29, 1999Advanced Micro Devices, Inc.Computer systemUS6294954Jan 11, 2000Sep 25, 2001Audiologic, IncorporatedAdaptive dead time control for switching circuitsUS6389139 *Nov 18, 1997May 14, 2002Dana InnovationsPowered volume control for distributed audio systemUS6429737 *Jul 6, 2000Aug 6, 2002Stmicroelectronics, Inc.Method and apparatus for multi-channel digital amplificationUS6683494 *Mar 26, 2002Jan 27, 2004Harman International Industries, IncorporatedDigital signal processor enhanced pulse width modulation amplifierUS7099426 *Sep 3, 2002Aug 29, 2006Xilinx, Inc.Flexible channel bonding and clock correction operations on a multi-block data pathUS7302396 *Apr 27, 1999Nov 27, 2007Realnetworks, Inc.System and method for cross-fading between audio streamsUS20020122518 *Nov 8, 2001Sep 5, 2002Nobuyuki YasudaSampling frequency conversion apparatusUS20030042976 *Aug 30, 2001Mar 6, 2003Pallab MidyaCircuitry for creating a spectral null in a differential output swiitching amplifier and method therefor* Cited by examinerClassifications U.S. Classification700/94, 341/61, 713/503International ClassificationG06F17/00, H03M7/00, G06F1/04Cooperative ClassificationH03M5/08, H03F3/217European ClassificationH03F3/217, H03M5/08Legal EventsDateCodeEventDescriptionJan 10, 2014REMIMaintenance fee reminder mailedMay 5, 2010ASAssignmentFree format text: SECURITY AGREEMENT;ASSIGNORS:INTERSIL CORPORATION;TECHWELL, INC.;INTERSIL COMMUNICATIONS, INC. AND OTHERS;REEL/FRAME:24337/395Owner name: MORGAN STANLEY & CO. INCORPORATED,NEW YORKEffective date: 20100427Free format text: SECURITY AGREEMENT;ASSIGNORS:INTERSIL CORPORATION;TECHWELL, INC.;INTERSIL COMMUNICATIONS, INC.;AND OTHERS;REEL/FRAME:024337/0395Owner name: MORGAN STANLEY & CO. INCORPORATED, NEW YORKMar 24, 2009ASAssignmentFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TAYLOR, WILSON E.;REEL/FRAME:22441/449Effective date: 20090320Owner name: D2AUDIO CORPORATION,CALIFORNIAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TAYLOR, WILSON E.;REEL/FRAME:022441/0449Mar 19, 2004ASAssignmentEffective date: 20040318Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HAND, LARRY E.;ANDERSEN, JACK B.;CHIENG, DANIEL L. W. AND OTHERS;REEL/FRAME:15123/482Owner name: D2AUDIO CORPORATION,TEXASFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HAND, LARRY E.;ANDERSEN, JACK B.;CHIENG, DANIEL L. W.;AND OTHERS;REEL/FRAME:015123/0482RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google