Inventor · disambiguated record
Masayuki Iwamatsu
Also filed as: IWAMATSU MASAYUKI
30 granted patents·1 pending application·766 citations·filing 1977–2011
97Inventor score
Top patents by PatentIndex Score
31 records- 0197US8164388B2Amplifying apparatusIWAMATSU MASAYUKI·Filed 2010·Granted Apr 24, 2012·71 cites·5 claims
- 0295US7482870B2Class D amplifierYAMAHA CORP·Filed 2006·Granted Jan 27, 2009·29 cites·17 claims
- 0392US4851842AAnalog-to-digital conversion circuitIWAMATSU MASAYUKI·Filed 1988·Granted Jul 25, 1989·75 cites·4 claims
- 0490US5046107AInput level adjusting circuitYAMAHA CORP·Filed 1989·Granted Sep 3, 1991·53 cites·6 claims
- 0590US4856064ASound field control apparatusYAMAHA CORP·Filed 1988·Granted Aug 8, 1989·69 cites·4 claims
- 0687US5027687ASound field control deviceYAMAHA CORP·Filed 1989·Granted Jul 2, 1991·59 cites·11 claims
- 0785US4087759APower amplifier devicesNIPPON MUSICAL INSTRUMENTS MFG·Filed 1977·Granted May 2, 1978·20 cites·7 claims
- 0882US5999630ASound image and sound field controlling deviceYAMAHA CORP·Filed 1995·Granted Dec 7, 1999·86 cites·4 claims
- 0980US4121169AAmplifier deviceNIPPON MUSICAL INSTRUMENTS MFG·Filed 1977·Granted Oct 17, 1978·17 cites·14 claims
- 1079US4302727APower amplifier having bias circuit with temperature compensationNIPPON MUSICAL INSTRUMENTS MFG·Filed 1979·Granted Nov 24, 1981·16 cites·10 claims
- 1177US5040220AControl circuit for controlling reproduced tone characteristicsYAMAHA CORP·Filed 1989·Granted Aug 13, 1991·34 cites·8 claims
- 1277US4476442AAmplifier with distortion cancellationNIPPON MUSICAL INSTRUMENTS MFG·Filed 1982·Granted Oct 9, 1984·19 cites·10 claims
- 1376US5524053ASound field control deviceYAMAHA CORP·Filed 1994·Granted Jun 4, 1996·42 cites·11 claims
- 1470US8050425B2Audio signal supplying device, parameter providing system, television set, AV system, speaker apparatus, and audio signal supplying methodYAMAHA CORP·Filed 2008·Granted Nov 1, 2011·5 cites·15 claims
- 1569US4356452AClass A push-pull amplifier with bias controlling circuitNIPPON MUSICAL INSTRUMENTS MFG·Filed 1980·Granted Oct 26, 1982·14 cites·13 claims
- 1667US4241314ATransistor amplifier circuitsNIPPON MUSICAL INSTRUMENTS MFG·Filed 1978·Granted Dec 23, 1980·11 cites·2 claims
- 1767US4077012AAmplifier devicesNIPPON MUSICAL INSTRUMENTS MFG·Filed 1977·Granted Feb 28, 1978·11 cites·5 claims
- 1865US5680464ASound field controlling deviceYAMAHA CORP·Filed 1996·Granted Oct 21, 1997·46 cites·7 claims
- 1965US4910515ADigital signal processing circuitYAMAHA CORP·Filed 1988·Granted Mar 20, 1990·20 cites·4 claims
- 2063US7551031B2AmplifierYAMAHA CORP·Filed 2008·Granted Jun 23, 2009·2 cites·5 claims
- 2162US7961011B2AmplifierYAMAHA CORP·Filed 2008·Granted Jun 14, 2011·2 cites·15 claims
- 2258US8149057B2Signal processing circuitIWAMATSU MASAYUKI·Filed 2011·Granted Apr 3, 2012·2 cites·6 claims
- 2358US7961044B2AmplifierYAMAHA CORP·Filed 2009·Granted Jun 14, 2011·1 cites·10 claims
- 2458US5727067ASound field control deviceYAMAHA CORP·Filed 1996·Granted Mar 10, 1998·37 cites·3 claims
- 2551US2009052696A1Electroacoustic transducerYAMAHA CORP·Filed 2008·Application pending·0 cites
- 2649US4745298ASignal selection circuitNIPPON MUSICAL INSTRUMENTS MFG·Filed 1987·Granted May 17, 1988·14 cites·5 claims
- 2748US8265283B2Acoustic processing device and acoustic processing methodIWAMATSU MASAYUKI·Filed 2008·Granted Sep 11, 2012·0 cites·11 claims
- 2843US4217555AAmplifier circuit arrangement with stabilized power-supply currentNIPPON MUSICAL INSTRUMENTS MFG·Filed 1978·Granted Aug 12, 1980·4 cites·6 claims
- 2943US4137506ACompound transistor circuitryNIPPON MUSICAL INSTRUMENTS MFG·Filed 1977·Granted Jan 30, 1979·4 cites·9 claims
- 3040US8483407B2Noise reducing circuitIWAMATSU MASAYUKI·Filed 2010·Granted Jul 9, 2013·0 cites·4 claims
- 3133US4899150ADigital signal processing circuitYAMAHA CORP·Filed 1988·Granted Feb 6, 1990·3 cites·2 claims
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