Inventor
TOKUMO AKIO
21 patents
Patents
21 patentsUS4980914ADec 25, 1990
Sound field correction system
PIONEER ELECTRONIC CORP68 citations96
US4949048AAug 14, 1990
Pulse width modulation amplifier circuit
PIONEER ELECTRONIC CORP77 citations96
US4739513AApr 19, 1988
Method and apparatus for measuring and correcting acoustic characteristic in sound field
PIONEER ELECTRONIC CORP83 citations96
US4696370ASep 29, 1987
Headrest-mounted acoustic device
PIONEER ELECTRONIC CORP59 citations96
US4476571AOct 9, 1984
Automatic sound volume control device
PIONEER ELECTRONIC CORP64 citations96
US4622691ANov 11, 1986
Mobile sound field correcting device
PIONEER ELECTRONIC CORP57 citations95
US5343161AAug 30, 1994
Power amplifier apparatus
PIONEER ELECTRONIC CORP29 citations92
US4992749AFeb 12, 1991
Pulse-width modulating amplifier circuit
PIONEER ELECTRONIC CORP39 citations92
US4968948ANov 6, 1990
Pulse width modulation amplifier circuit
PIONEER ELECTRONIC CORP40 citations92
US4952884AAug 28, 1990
Pulse width modulation amplifier circuit
PIONEER ELECTRONIC CORP30 citations92
US4868878ASep 19, 1989
Sound field correction system
PIONEER ELECTRONIC CORP28 citations92
US4694498ASep 15, 1987
Automatic sound field correcting system
PIONEER ELECTRONIC CORP40 citations92
US4648117AMar 3, 1987
Mobile sound field correcting device
PIONEER ELECTRONIC CORP47 citations92
US4415863ANov 15, 1983
Pulse width modulation amplifier
PIONEER ELECTRONIC CORP35 citations92
US4456887AJun 26, 1984
Differential amplifier
PIONEER ELECTRONIC CORP24 citations82
US4644292AFeb 17, 1987
Automatic gain and frequency characteristic control unit in audio device
PIONEER ELECTRONIC CORP19 citations81
US4928071AMay 22, 1990
Limiter circuit
PIONEER ELECTRONIC CORP8 citations74
US4496860AJan 29, 1985
Voltage-controlled attenuator
PIONEER ELECTRONIC CORP7 citations74
US5043676AAug 27, 1991
Automatic level control circuit
PIONEER ELECTRONIC CORP2 citations63
US4258329AMar 24, 1981
Noise suppression system
PIONEER ELECTRONIC CORP4 citations63
US4418323ANov 29, 1983
Oscillator having capacitor charged and discharged by current mirror circuits
PIONEER ELECTRONIC CORP4 citations62