Source: http://www.google.com/patents/US5291557?dq=6,205,432
Timestamp: 2015-04-26 20:05:01
Document Index: 741572116

Matched Legal Cases: ['art 3', 'art 3', 'art.5', 'art 3', 'art 3', 'art.7']

Patent US5291557 - Adaptive rematrixing of matrixed audio signals - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsIn a system in which a low-bit rate encoder and decoder carries matrixed audio signals, an adaptive rematrix rematrixes matrixed signals from an unmodified 4:2 matrix encoder to separate and isolate quiet components from loud ones, thereby avoiding the corruption of quiet signals with the low-bit-rate...http://www.google.com/patents/US5291557?utm_source=gb-gplus-sharePatent US5291557 - Adaptive rematrixing of matrixed audio signalsAdvanced Patent SearchPublication numberUS5291557 APublication typeGrantApplication numberUS 07/959,730Publication dateMar 1, 1994Filing dateOct 13, 1992Priority dateOct 13, 1992Fee statusPaidAlso published asCA2142092A1, CA2142092C, DE69311569D1, DE69311569T2, EP0664943A1, EP0664943B1, WO1994009608A1Publication number07959730, 959730, US 5291557 A, US 5291557A, US-A-5291557, US5291557 A, US5291557AInventorsMark F. Davis, Stephen D. VernonOriginal AssigneeDolby Laboratories Licensing CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (3), Non-Patent Citations (14), Referenced by (35), Classifications (6), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetAdaptive rematrixing of matrixed audio signals
US 5291557 AAbstract
1. Apparatus for adaptively rematrixing the audio output signals of a 4:2 audio signal matrix for coding, transmission, or storage and retrieval in a system in which the noise level varies with signal amplitude level, comprisingmeans for determining which of the signals among the matrix output signals and the sum and difference of the matrix output signals has the smallest amplitude, and means for applying the matrix output signals to the coding, transmission, or storage and retrieval if one of the matrix output signals has the smallest amplitude and for applying the sum and difference of the matrix output signals to the coding, transmission, or storage and retrieval if one of the sum and difference of the matrix output signals has the smallest amplitude. 2. The apparatus of claim 1 wherein the sum of the matrix output signals is an amplitude weighted sum and the difference of the matrix output signals is an amplitude weighted difference.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS3944735 *May 22, 1974Mar 16, 1976John C. BogueDirectional enhancement system for quadraphonic decodersUS4799260 *Feb 26, 1986Jan 17, 1989Dolby Laboratories Licensing CorporationVariable matrix decoderUS5109417 *Dec 29, 1989Apr 28, 1992Dolby Laboratories Licensing CorporationLow bit rate transform coder, decoder, and encoder/decoder for high-quality audio* Cited by examinerNon-Patent CitationsReference1Davidson, Grant, Antill, Fielder, Louis, Antill, Mike; "High-Quality Audio Transform Coding at 128 kBits/s," Dolby Technical Papers Publication No. S90/8873, reprinted from Proceedings of International Acoustics, Speech, and Signal Processing, Albuquerque, N.M., Apr. 1990.2 *Davidson, Grant, Antill, Fielder, Louis, Antill, Mike; High Quality Audio Transform Coding at 128 kBits/s, Dolby Technical Papers Publication No. S90/8873, reprinted from Proceedings of International Acoustics, Speech, and Signal Processing, Albuquerque, N.M., Apr. 1990.3International Organization for Standardization, "Coding of Moving Pictures and Associated Audio for Digital Storage Media at up to about 1.5 Mbits/s," Document CD 11172-3, Part 3, Audio, Annex G, Joint Stereo Coding, subpart 3-G.2 ms- Stereo and Intensity Stereo Coding Layer III Sep. 1992, pp. G-1 and G-2.4International Organization for Standardization, "Coding of Moving Pictures and Associated Audio," ISO/IECF JTC1/SC2/WG11, MPEG 90/000, Berlin Meeting Documents, Dec. 1990, Appendix pp. 100, 101, and two unumbered pages labeled General Stereo Encoder Flow-Chart, and General Stereo Decoder Flow-Chart.5 *International Organization for Standardization, Coding of Moving Pictures and Associated Audio for Digital Storage Media at up to about 1.5 Mbits/s, Document CD 11172 3, Part 3, Audio, Annex G, Joint Stereo Coding, subpart 3 G.2 ms Stereo and Intensity Stereo Coding Layer III Sep. 1992, pp. G 1 and G 2.6 *International Organization for Standardization, Coding of Moving Pictures and Associated Audio, ISO/IECF JTC1/SC2/WG11, MPEG 90/000, Berlin Meeting Documents, Dec. 1990, Appendix pp. 100, 101, and two unumbered pages labeled General Stereo Encoder Flow Chart, and General Stereo Decoder Flow Chart.7ten Kate, W. R. Th. et al, "A New Surround-Stereo-Surround Coding Technique," J. Audio Eng. Soc., vol. 40, No. 5, May 1992, pp. 376-383 (German version appeared in RTM, vol. 35, pp. 10-16 (1991)).8ten Kate, W. R. Th. et al, "Matrixing of Bit Rate Reduced Audio Signals," Proc. ICASSP-92, vol. 2, pp. II-205-208, IEEE, San Francisco, Mar. 23-26, 1992.9 *ten Kate, W. R. Th. et al, A New Surround Stereo Surround Coding Technique, J. Audio Eng. Soc., vol. 40, No. 5, May 1992, pp. 376 383 (German version appeared in RTM, vol. 35, pp. 10 16 (1991)).10 *ten Kate, W. R. Th. et al, Matrixing of Bit Rate Reduced Audio Signals, Proc. ICASSP 92, vol. 2, pp. II 205 208, IEEE, San Francisco, Mar. 23 26, 1992.11 *Theiler, G nther et al, MUSICAM Surround: A Multi Channel Stereo Coding Method, Audio Engineering Society Preprint 3337, Presented at 92nd Convention, 1992 Mar. 24 27, Vienna, Austria.12Theiler, Gunther et al, "MUSICAM-Surround: A Multi-Channel Stereo Coding Method," Audio Engineering Society Preprint 3337, Presented at 92nd Convention, 1992 Mar. 24-27, Vienna, Austria.13van der Waal, Robbert G. et al, "Subband Coding of Stereophonic Digital Audio Signals," 1991 International Conference on Acoustics, Speech, and Signal Processing, vol. 5, May 14-17, 1991, Toronto, Ontario, Canada pp. 3601-3604.14 *van der Waal, Robbert G. et al, Subband Coding of Stereophonic Digital Audio Signals, 1991 International Conference on Acoustics, Speech, and Signal Processing, vol. 5, May 14 17, 1991, Toronto, Ontario, Canada pp. 3601 3604.* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS5463424 *Aug 3, 1993Oct 31, 1995Dolby Laboratories Licensing CorporationMulti-channel transmitter/receiver system providing matrix-decoding compatible signalsUS5625745 *Jan 31, 1995Apr 29, 1997Lucent Technologies Inc.Noise imaging protection for multi-channel audio signalsUS5632005 *Jun 7, 1995May 20, 1997Ray Milton DolbyEncoder/decoder for multidimensional sound fieldsUS5699484 *Apr 26, 1996Dec 16, 1997Dolby Laboratories Licensing CorporationMethod and apparatus for applying linear prediction to critical band subbands of split-band perceptual coding systemsUS5701346 *Feb 2, 1995Dec 23, 1997Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E.V.Method of coding a plurality of audio signalsUS5749073 *Mar 15, 1996May 5, 1998Interval Research CorporationSystem for automatically morphing audio informationUS5907623 *Nov 22, 1995May 25, 1999Sony Corporation Of JapanAudio noise reduction system implemented through digital signal processingUS6252905Feb 5, 1998Jun 26, 2001International Business Machines CorporationReal-time evaluation of compressed picture quality within a digital video encoderUS6529604 *Jun 29, 1998Mar 4, 2003Samsung Electronics Co., Ltd.Scalable stereo audio encoding/decoding method and apparatusUS6624873May 5, 1998Sep 23, 2003Dolby Laboratories Licensing CorporationMatrix-encoded surround-sound channels in a discrete digital sound formatUS6807278Sep 22, 1998Oct 19, 2004Sony Corporation Of JapanAudio noise reduction system implemented through digital signal processingUS6850622Jul 30, 2001Feb 1, 2005Sony CorporationSound field correction circuitUS7428440Nov 14, 2002Sep 23, 2008Realnetworks, Inc.Method and apparatus for preserving matrix surround information in encoded audio/videoUS7437299 *Mar 20, 2003Oct 14, 2008Koninklijke Philips Electronics N.V.Coding of stereo signalsUS7454257Feb 8, 2001Nov 18, 2008Warner Music GroupApparatus and method for down converting multichannel programs to dual channel programs using a smart coefficient generatorUS7490044Jun 8, 2004Feb 10, 2009Bose CorporationAudio signal processingUS7542815 *Sep 1, 2004Jun 2, 2009Akita Blue, Inc.Extraction of left/center/right information from two-channel stereo sourcesUS7630500 *Apr 15, 1994Dec 8, 2009Bose CorporationSpatial disassembly processorUS7668317 *May 30, 2001Feb 23, 2010Sony CorporationAudio post processing in DVD, DTV and other audio visual productsUS7894611Dec 7, 2009Feb 22, 2011Bose CorporationSpatial disassembly processorUS8086334May 7, 2009Dec 27, 2011Akita Blue, Inc.Extraction of a multiple channel time-domain output signal from a multichannel signalUS8538031 *Sep 15, 2010Sep 17, 2013Dolby International AbMethod for representing multi-channel audio signalsUS8600533Nov 21, 2011Dec 3, 2013Akita Blue, Inc.Extraction of a multiple channel time-domain output signal from a multichannel signalUS8693696Aug 31, 2010Apr 8, 2014Dolby International AbApparatus and method for generating a level parameter and apparatus and method for generating a multi-channel representationUS8824690May 23, 2011Sep 2, 2014Samsung Electronics Co., Ltd.Apparatus and method for processing multi-channel audio signal using space informationUS20110002470 *Sep 15, 2010Jan 6, 2011Heiko PurnhagenMethod for Representing Multi-Channel Audio SignalsDE4409368A1 *Mar 18, 1994Sep 21, 1995Fraunhofer Ges ForschungVerfahren zum Codieren mehrerer AudiosignaleEP0725492A2 *Jan 24, 1996Aug 7, 1996AT&amp;T Corp.Perceptual stereo audio encoderEP2136361A1Jan 30, 2004Dec 23, 2009Dolby Laboratories Licensing Corp.Low-complexity audio transcodingWO1995026083A1 *Feb 2, 1995Sep 28, 1995Karlheinz BrandenburgProcess for coding a plurality of audio signalsWO1997019447A1 *Nov 22, 1996May 29, 1997Sony Pictures EntertainmentDsp decoder for decoding analog sr encoded audio signalsWO1997019448A1 *Nov 22, 1996May 29, 1997Sony Pictures EntertainmentAudio noise reduction system implemented through digital signal processingWO1997037512A1 *Mar 14, 1997Oct 9, 1997Harman Int IndSix-axis surround sound processor with improved matrix and cancellation controlWO2002099727A2 *Feb 8, 2002Dec 12, 2002Warner Music Group IncApparatus and method for down converting multichannel programs to dual channel programs using a smart coefficient generatorWO2003092260A2 *Apr 22, 2003Nov 6, 2003Realnetworks IncMethod and apparatus for preserving matrix surround information in encoded audio/video* Cited by examinerClassifications U.S. Classification381/22, 381/23International ClassificationH05H5/00, H04S3/02Cooperative ClassificationH04S3/02European ClassificationH04S3/02Legal EventsDateCodeEventDescriptionAug 17, 2005FPAYFee paymentYear of fee payment: 12Aug 16, 2001FPAYFee paymentYear of fee payment: 8Aug 21, 1997FPAYFee paymentYear of fee payment: 4Dec 10, 1996CCCertificate of correctionOct 13, 1992ASAssignmentOwner name: DOLBY LABORATORIES LICENSING CORPORATION, CALIFORNFree format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:DAVIS, MARK FRANKLIN;REEL/FRAME:006361/0478Effective date: 19921012Owner name: DOLBY LABORATORIES LICENSING CORPORATION, CALIFORNFree format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:VERNON, STEPHEN D.;REEL/FRAME:006361/0482Effective date: 19921012RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services