Inventor
TSUKAMOTO NOBUO
JP37 patents
⚠️ This page may combine multiple inventors who share the name “TSUKAMOTO NOBUO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
10 patentsUS5128981AJul 7, 1992
Radio communication system and a portable wireless terminal
HITACHI LTD339 citations99
US4881271ANov 14, 1989
Portable wireless communication systems
HITACHI LTD157 citations97
US5157660AOct 20, 1992
Communication system including portable terminals and fixed terminals
HITACHI LTD115 citations96
US5420845AMay 30, 1995
Methods of varying optical properties, optical devices, information recording media and information recording methods and apparatuses
HITACHI LTD39 citations92
US4441192AApr 3, 1984
Signal processing system having impulse response detecting circuit
HITACHI LTD30 citations92
US5392456AFeb 21, 1995
Method of controlling filter time constant and filter circuit having the time constant control function based on the method
HITACHI LTD33 citations90
US7359314B2Apr 15, 2008
Signal transmission system for transmitting a signal with a guard interval and a demodulation method thereof
HITACHI LTD10 citations84
US4250492AFeb 10, 1981
Non-uniform weighting circuitry
HITACHI LTD14 citations74
US4346472AAug 24, 1982
Method and apparatus for eliminating double bit errosion in a differential phase shift keying system
HITACHI LTD11 citations72
US5079513AJan 7, 1992
Demodulator and radio receiver having such a demodulator
HITACHI LTD5 citations60
HITACHI ELECTRONICS
9 patentsUS6512798B1Jan 28, 2003
Digital communication system of orthogonal modulation type
HITACHI ELECTRONICS78 citations98
US6304611B1Oct 16, 2001
OFDM modulator and OFDM modulation method for digital modulated wave having guard interval
HITACHI ELECTRONICS104 citations96
US6381251B1Apr 30, 2002
Data transmission apparatus and receiving apparatus using orthogonal frequency division multiplex modulation system
HITACHI ELECTRONICS51 citations92
US6246735B1Jun 12, 2001
Synchronization detection method for data transmission apparatus and data transmission apparatus using the same
HITACHI ELECTRONICS44 citations92
US6611493B1Aug 26, 2003
Communication, transmission and receiving method and apparatus using orthogonal frequency division multiplexing modulation system
HITACHI ELECTRONICS27 citations91
US6381236B1Apr 30, 2002
Bi-directional digital transmission system and bi-directional digital transmission method
HITACHI ELECTRONICS15 citations84
US6046629AApr 4, 2000
Method of an apparatus for demodulating amplitude-modulated signals in an amplitude phase shift keying (APSK) system
HITACHI ELECTRONICS20 citations83
US6473466B1Oct 29, 2002
Data transmitting method and data transmitting apparatus accompanied with a plurality of transmitting of receiving antennas
HITACHI ELECTRONICS8 citations72
US6813326B1Nov 2, 2004
Data transmission system, data transmission communication station, and data transmission method
HITACHI ELECTRONICS8 citations69
NIHON DEMPA KOGYO CO
7 patentsUS7398163B2Jul 8, 2008
Sensing apparatus
NIHON DEMPA KOGYO CO13 citations84
US7821344B2Oct 26, 2010
VCO driving circuit and frequency synthesizer
NIHON DEMPA KOGYO CO8 citations83
US7825701B2Nov 2, 2010
Frequency synthesizer
NIHON DEMPA KOGYO CO6 citations73
US7899633B2Mar 1, 2011
Sensing apparatus
NIHON DEMPA KOGYO CO4 citations62
US7893774B2Feb 22, 2011
VCO driving circuit and frequency synthesizer
NIHON DEMPA KOGYO CO2 citations62
US7888974B2Feb 15, 2011
Frequency synthesizer
NIHON DEMPA KOGYO CO2 citations62
US7603100B2Oct 13, 2009
High-frequency radio apparatus
NIHON DEMPA KOGYO CO0 citations52
HITACHI INT ELECTRIC INC
5 patentsUS7180368B2Feb 20, 2007
Distortion compensation circuit, distortion compensation signal generating method, and power amplifier
HITACHI INT ELECTRIC INC11 citations82
US6879630B2Apr 12, 2005
Automatic equalization circuit and receiver circuit using the same
HITACHI INT ELECTRIC INC15 citations82
US7242247B2Jul 10, 2007
Distortion compensation circuit, power amplifier using distortion compensation circuit, and distortion compensation signal generating method
HITACHI INT ELECTRIC INC16 citations79
US6745365B2Jun 1, 2004
Coder with error correction, decoder with error correction and data transmission apparatus using the coder and decoder
HITACHI INT ELECTRIC INC5 citations61
US7483368B2Jan 27, 2009
Method and detecting carrier shift amount in digital transmission signal, method of correcting carrier shift amount, and receiver employing these methods
HITACHI INT ELECTRIC INC0 citations41