Inventor · disambiguated record
Akihisa Kawamura
Also filed as: KAWAMURA AKIHISA
72 granted patents·10 pending applications·1,856 citations·filing 1981–2024
99Inventor score
Files withMATSUSHITA ELECTRIC INDUSTRIAL CO LTD46PANASONIC IP MAN CO LTD10PANASONIC IP CORP AMERICA6PANASONIC CORP5SONY CORP3
Top patents by PatentIndex Score
82 records- 0193US6938209B2Audio information provision systemMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2002·Granted Aug 30, 2005·105 cites·19 claims
- 0293US6631352B1Decoding circuit and reproduction apparatus which mutes audio after header parameter changesMATUSHITA ELECTRIC IND CO LTD·Filed 2000·Granted Oct 7, 2003·110 cites·28 claims
- 0392US5796845ASound field and sound image control apparatus and methodMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1997·Granted Aug 18, 1998·149 cites·10 claims
- 0491US7069223B1Compressed code decoding device and audio decoding deviceMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2000·Granted Jun 27, 2006·76 cites·24 claims
- 0591US5677987AFeedback detector and suppressorMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1994·Granted Oct 14, 1997·169 cites·12 claims
- 0689US6295319B1Decoding deviceMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1999·Granted Sep 25, 2001·115 cites·13 claims
- 0788US5381482ASound field controllerMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1993·Granted Jan 10, 1995·87 cites·8 claims
- 0887US7394499B2Data transmitting method, data receiving method, data transmitting device, and data receiving deviceMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2002·Granted Jul 1, 2008·35 cites·10 claims
- 0987US7225388B2Error correction encoding and decoding methods and apparatuses for DVI audio dataSONY CORP·Filed 2005·Granted May 29, 2007·7 cites·8 claims
- 1087US5442712ASound amplifying apparatus with automatic howl-suppressing functionMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1993·Granted Aug 15, 1995·100 cites·19 claims
- 1186US10462553B2Speaker devicePANASONIC IP MAN CO LTD·Filed 2018·Granted Oct 29, 2019·5 cites·10 claims
- 1286US9820047B2Signal processing method and speaker systemPANASONIC IP MAN CO LTD·Filed 2016·Granted Nov 14, 2017·6 cites·10 claims
- 1386US8081764B2Audio decoderTAKAGI YOSIAKI·Filed 2006·Granted Dec 20, 2011·29 cites·8 claims
- 1486US8019614B2Energy shaping apparatus and energy shaping methodPANASONIC CORP·Filed 2006·Granted Sep 13, 2011·21 cites·20 claims
- 1586US5572591ASound field controllerMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1994·Granted Nov 5, 1996·78 cites·6 claims
- 1686US5164840AApparatus for supplying control codes to sound field reproduction apparatusMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1989·Granted Nov 17, 1992·37 cites·14 claims
- 1785US7844355B2Stream reproduction device and stream supply devicePANASONIC CORP·Filed 2006·Granted Nov 30, 2010·5 cites·5 claims
- 1884US5742688ASound field controller and control methodMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1995·Granted Apr 21, 1998·69 cites·24 claims
- 1983US6823310B2Audio signal processing device and audio signal high-rate reproduction method used for audio visual equipmentMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2001·Granted Nov 23, 2004·37 cites·15 claims
- 2082US9774935B2Speaker devicePANASONIC IP MAN CO LTD·Filed 2016·Granted Sep 26, 2017·4 cites·10 claims
- 2182US4751739AApparatus and method for controlling tone qualityMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1986·Granted Jun 14, 1988·33 cites·9 claims
- 2280US4896285ACalculation of filter factors for digital filterMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1988·Granted Jan 23, 1990·26 cites·31 claims
- 2378US5375188AMusic/voice discriminating apparatusMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1992·Granted Dec 20, 1994·35 cites·6 claims
- 2478US4888808ADigital equalizer apparatus enabling separate phase and amplitude characteristic modificationMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1988·Granted Dec 19, 1989·64 cites·31 claims
- 2575US6356639B1Audio decoding apparatus, signal processing device, sound image localization device, sound image control method, audio signal processing device, and audio signal high-rate reproduction method used for audio visual equipmentMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1998·Granted Mar 12, 2002·42 cites·10 claims
- 2672US10491984B2Speaker devicePANASONIC IP MAN CO LTD·Filed 2016·Granted Nov 26, 2019·2 cites·9 claims
- 2771US10777209B1Coding apparatus and coding methodPANASONIC IP CORP AMERICA·Filed 2018·Granted Sep 15, 2020·2 cites·7 claims
- 2871US8184817B2Multi-channel acoustic signal processing deviceTAKAGI YOSHIAKI·Filed 2006·Granted May 22, 2012·7 cites·10 claims
- 2970US7236838B2Signal processing apparatus, signal processing method, program and recording mediumMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2001·Granted Jun 26, 2007·12 cites·8 claims
- 3070US6584443B1Apparatus and method for audio data/audio-related information transferMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2000·Granted Jun 24, 2003·9 cites·27 claims
- 3169US6363407B1Exponential calculation device and decoding deviceMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2001·Granted Mar 26, 2002·12 cites·16 claims
- 3268US8284961B2Signal processing deviceMIYASAKA SHUJI·Filed 2006·Granted Oct 9, 2012·6 cites·8 claims
- 3366US6297754B1Decoding deviceMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2000·Granted Oct 2, 2001·14 cites·10 claims
- 3465US12513454B2Loudspeaker devicePANASONIC IP CORP AMERICA·Filed 2023·Granted Dec 30, 2025·0 cites·11 claims
- 3565US12513455B2Audio devicePANASONIC IP CORP AMERICA·Filed 2023·Granted Dec 30, 2025·0 cites·13 claims
- 3665US6751177B1Signal processorMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1999·Granted Jun 15, 2004·17 cites·7 claims
- 3765US6460016B1Audio decoding device for decoding coded audio information with multiple channelsMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2000·Granted Oct 1, 2002·12 cites·7 claims
- 3864US7714934B2Transmission method, transmission system, sending device and reception deviceSONY CORP·Filed 2006·Granted May 11, 2010·1 cites·4 claims
- 3964US6546105B1Sound image localization device and sound image localization methodMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1999·Granted Apr 8, 2003·37 cites·32 claims
- 4064US5684881ASound field and sound image control apparatus and methodMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1994·Granted Nov 4, 1997·23 cites·20 claims
- 4163US7129991B2Transmission method of digital audio data with video dataMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2002·Granted Oct 31, 2006·6 cites·24 claims
- 4263US6473374B1Method of transmitting data among a plurality of LSIs, and DVD-audio reproducing apparatus using the methodMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2000·Granted Oct 29, 2002·4 cites·26 claims
- 4363US5617478ASound reproduction system and a sound reproduction methodMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1994·Granted Apr 1, 1997·38 cites·2 claims
- 4462US7230650B2Data transmission method, data receiving method, video data transmission apparatus and video data receiving apparatusMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2002·Granted Jun 12, 2007·7 cites·12 claims
- 4562US2024147154A1Acoustic devicePANASONIC IP CORP AMERICA·Filed 2023·Application pending·0 cites
- 4660US5123050ASound field control systemMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1990·Granted Jun 16, 1992·17 cites·2 claims
- 4759US7050870B2Reproduction apparatus and music delivery systemMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2001·Granted May 23, 2006·7 cites·7 claims
- 4859US6377641B1Reproduction apparatus and reproduction methodMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2000·Granted Apr 23, 2002·3 cites·10 claims
- 4959US2025071456A1Loudspeaker devicePANASONIC IP MAN CO LTD·Filed 2024·Application pending·0 cites
- 5058US11994605B2Direction of arrival estimation device, system, and direction of arrival estimation methodPANASONIC IP CORP AMERICA·Filed 2020·Granted May 28, 2024·0 cites·9 claims
Showing the top 50 of 82 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →