Inventor · disambiguated record
Yoshizumi Watatani
Also filed as: WATATANI YOSHIZUMI
48 granted patents·444 citations·filing 1974–2007
98Inventor score
Top patents by PatentIndex Score
48 records- 0189US4677645AAudio signal transmission system having noise reduction meansHITACHI LTD·Filed 1984·Granted Jun 30, 1987·75 cites·8 claims
- 0286US5337199ADigital transmission signal processing system and recording/reproducing systemHITACHI LTD·Filed 1991·Granted Aug 9, 1994·35 cites·3 claims
- 0379US4825305AApparatus for recording and reproducing digital using dynamic range compressionHITACHI LTD·Filed 1987·Granted Apr 25, 1989·27 cites·9 claims
- 0474US7259926B2Digital information recording/reproducing apparatusHITACHI LTD·Filed 2005·Granted Aug 21, 2007·1 cites·3 claims
- 0574US4769722AApparatus for recording and reproducing a video signal and for recording and reproducing a PCM audio signal on forward and reverse tape travelling directionsHITACHI LTD·Filed 1985·Granted Sep 6, 1988·20 cites·4 claims
- 0673US3941930ASynchronizing signal regeneratorHITACHI LTD·Filed 1974·Granted Mar 2, 1976·19 cites·7 claims
- 0770US5122885AMagnetic video recording/reproducing apparatus for video signals of different aspect ratios adapter unitHITACHI LTD·Filed 1990·Granted Jun 16, 1992·35 cites·19 claims
- 0869US4453186AVideo and sound signal recording and reproducing deviceHITACHI LTD·Filed 1981·Granted Jun 5, 1984·18 cites·22 claims
- 0969US4361813AFM Audio demodulator with dropout noise elimination circuitHITACHI LTD·Filed 1980·Granted Nov 30, 1982·16 cites·3 claims
- 1069US4216431AIntegrated circuit for frequency conversionHITACHI LTD·Filed 1978·Granted Aug 5, 1980·17 cites·5 claims
- 1167US7952823B2Method for transmitting digital audio and video informationHITACHI CONSUMER ELECTRONICS·Filed 2007·Granted May 31, 2011·0 cites·10 claims
- 1266US7859777B2Method and apparatus for transmitting and receiving digital video and audio informationHITACHI CONSUMER ELECTRONICS·Filed 2007·Granted Dec 28, 2010·0 cites·11 claims
- 1366US7808733B2Method and apparatus for transmitting and receiving digital video and audio informationHITACHI CONSUMER ELECTRONICS·Filed 2007·Granted Oct 5, 2010·0 cites·19 claims
- 1464US7286310B2Apparatus for receiving compressed digital informationHITACHI LTD·Filed 2006·Granted Oct 23, 2007·0 cites·7 claims
- 1564US6324025B1Digital transmission signal processing system and recording/reproducing systemHITACHI LTD·Filed 2000·Granted Nov 27, 2001·2 cites·9 claims
- 1663US5307171AVideo tape recorder/playerHITACHI LTD·Filed 1990·Granted Apr 26, 1994·24 cites·16 claims
- 1763US4992891ADual record/read head video recording and playback apparatus with fade-in functionHITACHI LTD·Filed 1989·Granted Feb 12, 1991·13 cites·3 claims
- 1862US8009375B2Apparatus and method for receiving and recording digital informationHITACHI CONSUMER ELECTRONICS·Filed 2005·Granted Aug 30, 2011·0 cites·32 claims
- 1959US6278564B1Digital transmission signal processing system and recording/reproducing systemHITACHI LTD·Filed 2000·Granted Aug 21, 2001·1 cites·5 claims
- 2058US4403262AAudio signal muting circuit for magnetic recording and reproducing apparatusHITACHI LTD·Filed 1981·Granted Sep 6, 1983·12 cites·3 claims
- 2156US5459585AApparatus and method of storing image signalsHITACHI LTD·Filed 1993·Granted Oct 17, 1995·11 cites·10 claims
- 2255US4490753AAudio signal recording and reproducing circuitHITACHI LTD·Filed 1982·Granted Dec 25, 1984·8 cites·7 claims
- 2351US7027240B2Digital information recording/reproducing method and apparatusHITACHI LTD·Filed 2003·Granted Apr 11, 2006·0 cites·15 claims
- 2451US4110761AColor signal processing apparatus for video signal recording and reproducing systemHITACHI LTD·Filed 1976·Granted Aug 29, 1978·8 cites·6 claims
- 2550US6952315B2Digital information recording/reproducing apparatusHITACHI LTD·Filed 2003·Granted Oct 4, 2005·0 cites·2 claims
- 2650US6590726B2Apparatus and method for transmitting and receiving digital informationHITACHI LTD·Filed 2002·Granted Jul 8, 2003·0 cites·10 claims
- 2750US5671095ADigital transmission signal processing system and recording/reproducing systemHITACHI LTD·Filed 1994·Granted Sep 23, 1997·6 cites·26 claims
- 2848US7012769B2Digital information recording/reproducing apparatusHITACHI LTD·Filed 2003·Granted Mar 14, 2006·0 cites·9 claims
- 2948US5530598ADigital transmission signal processing system and recording/reproducing systemHITACHI LTD·Filed 1995·Granted Jun 25, 1996·8 cites·2 claims
- 3048US5517368ADigital transmission signal processing system and recording/reproducing systemHITACHI LTD·Filed 1995·Granted May 14, 1996·8 cites·1 claims
- 3147US4994923AVideo signal recording and reproducing apparatus with signal processing circuit for improvement of picture qualityHITACHI LTD·Filed 1989·Granted Feb 19, 1991·9 cites·21 claims
- 3247US4991026AChrominance signal reproducing apparatus for video tape recorderHITACHI LTD·Filed 1988·Granted Feb 5, 1991·9 cites·10 claims
- 3347US4843488ANoise elimination circuit for reproduction of audio signals in a magnetic tape recording and reproducing apparatusHITACHI LTD·Filed 1981·Granted Jun 27, 1989·6 cites·5 claims
- 3447US4604659AApparatus for detecting a drop-out in a magnetic recording/reproducing apparatusHITACHI LTD·Filed 1984·Granted Aug 5, 1986·5 cites·25 claims
- 3546US6498691B2Digital transmission signal processing system and recording/reproducing systemHITACHI LTD·Filed 2001·Granted Dec 24, 2002·0 cites·12 claims
- 3646US4481546AModulator-demodulator for obtaining and demodulating frequency-modulated signalHITACHI LTD·Filed 1982·Granted Nov 6, 1984·8 cites·8 claims
- 3745US4740847AMagnetic recording/reproducing apparatusHITACHI LTD·Filed 1986·Granted Apr 26, 1988·6 cites·4 claims
- 3845US3969581AVertical synchronizing signal recording apparatusHITACHI LTD·Filed 1975·Granted Jul 13, 1976·6 cites·3 claims
- 3944US6069757ADigital transmission signal processing system and recording/reproducing systemHITACHI LTD·Filed 1999·Granted May 30, 2000·2 cites·11 claims
- 4044US6002536ADigital transmission signal processing system and recording/reproducing systemHITACHI LTD·Filed 1998·Granted Dec 14, 1999·2 cites·12 claims
- 4142US5673154ADigital transmission signal processing system and recording/reproducing systemHITACHI LTD·Filed 1996·Granted Sep 30, 1997·3 cites·6 claims
- 4242US4403264APicture signal amplifying circuit for magnetic video recording and reproducing apparatusHITACHI LTD·Filed 1981·Granted Sep 6, 1983·4 cites·2 claims
- 4341US5323273AAudio signal recording and playback apparatus of magnetic recording and playback apparatusHITACHI LTD·Filed 1991·Granted Jun 21, 1994·7 cites·15 claims
- 4439US4491880AMagnetic recording and/or reproducing apparatusHITACHI LTD·Filed 1982·Granted Jan 1, 1985·5 cites·7 claims
- 4538US5862004ADigital transmission signal processing system and recording/reproducing systemHITACHI LTD·Filed 1997·Granted Jan 19, 1999·2 cites·2 claims
- 4635US5396372AAudio signal recording and reproducing apparatusHITACHI LTD·Filed 1990·Granted Mar 7, 1995·2 cites·14 claims
- 4734US4809096ATracking controlling device using multiple pilot signals in magnetic video signal recording and reproducing apparatusHITACHI LTD·Filed 1987·Granted Feb 28, 1989·3 cites·7 claims
- 4832US5699203ADigital transmission signal processing system and recording reproducing systemHITACHI LTD·Filed 1996·Granted Dec 16, 1997·1 cites·7 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →