Inventor
WATATANI YOSHIZUMI
JP48 patents
⚠️ This page may combine multiple inventors who share the name “WATATANI YOSHIZUMI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
44 patentsUS4677645AJun 30, 1987
Audio signal transmission system having noise reduction means
HITACHI LTD75 citations95
US5337199AAug 9, 1994
Digital transmission signal processing system and recording/reproducing system
HITACHI LTD35 citations93
US5307171AApr 26, 1994
Video tape recorder/player
HITACHI LTD24 citations92
US5122885AJun 16, 1992
Magnetic video recording/reproducing apparatus for video signals of different aspect ratios adapter unit
HITACHI LTD35 citations92
US4825305AApr 25, 1989
Apparatus for recording and reproducing digital using dynamic range compression
HITACHI LTD27 citations89
US4769722ASep 6, 1988
Apparatus for recording and reproducing a video signal and for recording and reproducing a PCM audio signal on forward and reverse tape travelling directions
HITACHI LTD20 citations81
US6324025B1Nov 27, 2001
Digital transmission signal processing system and recording/reproducing system
HITACHI LTD2 citations74
US6069757AMay 30, 2000
Digital transmission signal processing system and recording/reproducing system
HITACHI LTD2 citations74
US6002536ADec 14, 1999
Digital transmission signal processing system and recording/reproducing system
HITACHI LTD2 citations74
US5671095ASep 23, 1997
Digital transmission signal processing system and recording/reproducing system
HITACHI LTD6 citations74
US5530598AJun 25, 1996
Digital transmission signal processing system and recording/reproducing system
HITACHI LTD8 citations74
US5517368AMay 14, 1996
Digital transmission signal processing system and recording/reproducing system
HITACHI LTD8 citations74
US5323273AJun 21, 1994
Audio signal recording and playback apparatus of magnetic recording and playback apparatus
HITACHI LTD7 citations74
US4481546ANov 6, 1984
Modulator-demodulator for obtaining and demodulating frequency-modulated signal
HITACHI LTD8 citations74
US4361813ANov 30, 1982
FM Audio demodulator with dropout noise elimination circuit
HITACHI LTD16 citations74
US4216431AAug 5, 1980
Integrated circuit for frequency conversion
HITACHI LTD17 citations74
US4110761AAug 29, 1978
Color signal processing apparatus for video signal recording and reproducing system
HITACHI LTD8 citations74
US4994923AFeb 19, 1991
Video signal recording and reproducing apparatus with signal processing circuit for improvement of picture quality
HITACHI LTD9 citations73
US4992891AFeb 12, 1991
Dual record/read head video recording and playback apparatus with fade-in function
HITACHI LTD13 citations73
US4490753ADec 25, 1984
Audio signal recording and reproducing circuit
HITACHI LTD8 citations73
US4453186AJun 5, 1984
Video and sound signal recording and reproducing device
HITACHI LTD18 citations73
US4403262ASep 6, 1983
Audio signal muting circuit for magnetic recording and reproducing apparatus
HITACHI LTD12 citations73
US3941930AMar 2, 1976
Synchronizing signal regenerator
HITACHI LTD19 citations73
US4991026AFeb 5, 1991
Chrominance signal reproducing apparatus for video tape recorder
HITACHI LTD9 citations72
US5459585AOct 17, 1995
Apparatus and method of storing image signals
HITACHI LTD11 citations71
US7286310B2Oct 23, 2007
Apparatus for receiving compressed digital information
HITACHI LTD0 citations63
US7259926B2Aug 21, 2007
Digital information recording/reproducing apparatus
HITACHI LTD1 citations63
US7012769B2Mar 14, 2006
Digital information recording/reproducing apparatus
HITACHI LTD0 citations63
US6278564B1Aug 21, 2001
Digital transmission signal processing system and recording/reproducing system
HITACHI LTD1 citations63
US5862004AJan 19, 1999
Digital transmission signal processing system and recording/reproducing system
HITACHI LTD2 citations63
US5699203ADec 16, 1997
Digital transmission signal processing system and recording reproducing system
HITACHI LTD1 citations63
US5673154ASep 30, 1997
Digital transmission signal processing system and recording/reproducing system
HITACHI LTD3 citations63
US5396372AMar 7, 1995
Audio signal recording and reproducing apparatus
HITACHI LTD2 citations63
US4740847AApr 26, 1988
Magnetic recording/reproducing apparatus
HITACHI LTD6 citations63
US4604659AAug 5, 1986
Apparatus for detecting a drop-out in a magnetic recording/reproducing apparatus
HITACHI LTD5 citations63
US4403264ASep 6, 1983
Picture signal amplifying circuit for magnetic video recording and reproducing apparatus
HITACHI LTD4 citations63
US3969581AJul 13, 1976
Vertical synchronizing signal recording apparatus
HITACHI LTD6 citations63
US4843488AJun 27, 1989
Noise elimination circuit for reproduction of audio signals in a magnetic tape recording and reproducing apparatus
HITACHI LTD6 citations62
US4491880AJan 1, 1985
Magnetic recording and/or reproducing apparatus
HITACHI LTD5 citations62
US4809096AFeb 28, 1989
Tracking controlling device using multiple pilot signals in magnetic video signal recording and reproducing apparatus
HITACHI LTD3 citations61
US7027240B2Apr 11, 2006
Digital information recording/reproducing method and apparatus
HITACHI LTD0 citations52
US6952315B2Oct 4, 2005
Digital information recording/reproducing apparatus
HITACHI LTD0 citations52
US6590726B2Jul 8, 2003
Apparatus and method for transmitting and receiving digital information
HITACHI LTD0 citations52
US6498691B2Dec 24, 2002
Digital transmission signal processing system and recording/reproducing system
HITACHI LTD0 citations52
HITACHI CONSUMER ELECTRONICS
4 patentsUS8009375B2Aug 30, 2011
Apparatus and method for receiving and recording digital information
HITACHI CONSUMER ELECTRONICS0 citations63
US7952823B2May 31, 2011
Method for transmitting digital audio and video information
HITACHI CONSUMER ELECTRONICS0 citations63
US7859777B2Dec 28, 2010
Method and apparatus for transmitting and receiving digital video and audio information
HITACHI CONSUMER ELECTRONICS0 citations52
US7808733B2Oct 5, 2010
Method and apparatus for transmitting and receiving digital video and audio information
HITACHI CONSUMER ELECTRONICS0 citations52