Inventor
IWAMATSU MASAYUKI
JP30 patents
⚠️ This page may combine multiple inventors who share the name “IWAMATSU MASAYUKI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
YAMAHA CORP
15 patentsUS5999630ADec 7, 1999
Sound image and sound field controlling device
YAMAHA CORP86 citations96
US5027687AJul 2, 1991
Sound field control device
YAMAHA CORP59 citations96
US4856064AAug 8, 1989
Sound field control apparatus
YAMAHA CORP69 citations96
US7482870B2Jan 27, 2009
Class D amplifier
YAMAHA CORP29 citations92
US5727067AMar 10, 1998
Sound field control device
YAMAHA CORP37 citations92
US5680464AOct 21, 1997
Sound field controlling device
YAMAHA CORP46 citations92
US5524053AJun 4, 1996
Sound field control device
YAMAHA CORP42 citations92
US5046107ASep 3, 1991
Input level adjusting circuit
YAMAHA CORP53 citations92
US5040220AAug 13, 1991
Control circuit for controlling reproduced tone characteristics
YAMAHA CORP34 citations92
US4910515AMar 20, 1990
Digital signal processing circuit
YAMAHA CORP20 citations82
US8050425B2Nov 1, 2011
Audio signal supplying device, parameter providing system, television set, AV system, speaker apparatus, and audio signal supplying method
YAMAHA CORP5 citations63
US7551031B2Jun 23, 2009
Amplifier
YAMAHA CORP2 citations63
US4899150AFeb 6, 1990
Digital signal processing circuit
YAMAHA CORP3 citations63
US7961011B2Jun 14, 2011
Amplifier
YAMAHA CORP2 citations61
US7961044B2Jun 14, 2011
Amplifier
YAMAHA CORP1 citations52
NIPPON MUSICAL INSTRUMENTS MFG
10 patentsUS4087759AMay 2, 1978
Power amplifier devices
NIPPON MUSICAL INSTRUMENTS MFG20 citations82
US4745298AMay 17, 1988
Signal selection circuit
NIPPON MUSICAL INSTRUMENTS MFG14 citations74
US4476442AOct 9, 1984
Amplifier with distortion cancellation
NIPPON MUSICAL INSTRUMENTS MFG19 citations74
US4356452AOct 26, 1982
Class A push-pull amplifier with bias controlling circuit
NIPPON MUSICAL INSTRUMENTS MFG14 citations74
US4302727ANov 24, 1981
Power amplifier having bias circuit with temperature compensation
NIPPON MUSICAL INSTRUMENTS MFG16 citations74
US4241314ADec 23, 1980
Transistor amplifier circuits
NIPPON MUSICAL INSTRUMENTS MFG11 citations74
US4121169AOct 17, 1978
Amplifier device
NIPPON MUSICAL INSTRUMENTS MFG17 citations74
US4077012AFeb 28, 1978
Amplifier devices
NIPPON MUSICAL INSTRUMENTS MFG11 citations74
US4217555AAug 12, 1980
Amplifier circuit arrangement with stabilized power-supply current
NIPPON MUSICAL INSTRUMENTS MFG4 citations63
US4137506AJan 30, 1979
Compound transistor circuitry
NIPPON MUSICAL INSTRUMENTS MFG4 citations63
IWAMATSU MASAYUKI
5 patentsUS8164388B2Apr 24, 2012
Amplifying apparatus
IWAMATSU MASAYUKI71 citations97
US4851842AJul 25, 1989
Analog-to-digital conversion circuit
IWAMATSU MASAYUKI75 citations95
US8149057B2Apr 3, 2012
Signal processing circuit
IWAMATSU MASAYUKI2 citations62
US8483407B2Jul 9, 2013
Noise reducing circuit
IWAMATSU MASAYUKI0 citations41
US8265283B2Sep 11, 2012
Acoustic processing device and acoustic processing method
IWAMATSU MASAYUKI0 citations41