Inventor
SAWAGUCHI HIDEKI
JP46 patents
⚠️ This page may combine multiple inventors who share the name “SAWAGUCHI HIDEKI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
27 patentsUS6337889B1Jan 8, 2002
Partial response demodulating method and apparatus using the same
HITACHI LTD43 citations96
US5418660AMay 23, 1995
Information processing apparatus for processing reproduction signal having nonlinear characteristics
HITACHI LTD58 citations96
US5325244AJun 28, 1994
Magnetic recording data storage system
HITACHI LTD55 citations96
US7027248B2Apr 11, 2006
Magnetic disk apparatus having an adjustable mechanism to compensate write or heat element for off-tracking position with yaw angle
HITACHI LTD16 citations93
US6668349B1Dec 23, 2003
Data recording/readback method and data recording/readback device for the same
HITACHI LTD22 citations93
US6334201B1Dec 25, 2001
Decoding circuit and information processing apparatus
HITACHI LTD33 citations93
US6327112B1Dec 4, 2001
Adjacent track position detectable information storage apparatus
HITACHI LTD22 citations93
US6741412B2May 25, 2004
Data recording/reproducing signal processing circuit for magnetic recording, and perpendicular magnetic recording/reproducing apparatus using it
HITACHI LTD13 citations92
US6657805B2Dec 2, 2003
Method of controlling read write operation of a magnetic disk apparatus
HITACHI LTD27 citations92
US6310741B1Oct 30, 2001
Magnetic disk apparatus with data track reassigning function
HITACHI LTD19 citations92
US5881071AMar 9, 1999
Digital write-and-read method and signal processing apparatus
HITACHI LTD30 citations92
US5519398AMay 21, 1996
Signal processing apparatus having A/D conversion function
HITACHI LTD21 citations92
US5400189AMar 21, 1995
Magnetic recording and reproducing apparatus, reproduction signal processing apparatus, and reproduction signal processing method
HITACHI LTD33 citations92
US5287228AFeb 15, 1994
Peak detection method and apparatus therefor
HITACHI LTD36 citations92
US6912100B2Jun 28, 2005
Device and signal processing circuit for magnetic recording, magnetic recording apparatus
HITACHI LTD12 citations84
US6873665B2Mar 29, 2005
Digital magnetic recording/reproducing apparatus
HITACHI LTD12 citations84
US6725418B2Apr 20, 2004
Decoding circuit using path sequence including feed-back type path sequence storing blocks
HITACHI LTD13 citations84
US5594756AJan 14, 1997
Decision feedback equalization circuit
HITACHI LTD19 citations84
US5392316AFeb 21, 1995
Decoding method and apparatus with maximum likelihood sequence estimation
HITACHI LTD16 citations82
US7068462B2Jun 27, 2006
Magnetic recording apparatus
HITACHI LTD6 citations74
US7024617B2Apr 4, 2006
Data decoding method and circuit and information recording and reproducing apparatus using the same
HITACHI LTD10 citations74
US5568330AOct 22, 1996
Recording/reproducing apparatus with maximum likelihood sequence estimation
HITACHI LTD11 citations74
US5539588AJul 23, 1996
Magnetic recording/reproducing with added intersymbol interference to obtain a partial-response code
HITACHI LTD14 citations74
US6320916B1Nov 20, 2001
Digital magnetic recording/reproducing apparatus
HITACHI LTD6 citations73
US5467232ANov 14, 1995
Magnetic recording and reproducing method using phase discrimination and apparatus therefor
HITACHI LTD4 citations63
US7057838B2Jun 6, 2006
Magnetic disk device having a write head to write by shifting in a radial direction
HITACHI LTD1 citations52
US7046745B2May 16, 2006
Signal processing circuit
HITACHI LTD0 citations52
HITACHI GLOBAL STORAGE TECH
16 patentsUS7502189B2Mar 10, 2009
Apparatus, signal-processing circuit and device for magnetic recording system
HITACHI GLOBAL STORAGE TECH156 citations99
US7526710B2Apr 28, 2009
Recording format for information date, information recording/reproducing cording circuit
HITACHI GLOBAL STORAGE TECH16 citations93
US7443625B2Oct 28, 2008
Magnetic disk drive
HITACHI GLOBAL STORAGE TECH29 citations93
US7590920B2Sep 15, 2009
Reduced complexity error correction encoding techniques
HITACHI GLOBAL STORAGE TECH26 citations92
US7865799B2Jan 4, 2011
Recording format for information date, information recording/reproducing cording circuit
HITACHI GLOBAL STORAGE TECH8 citations84
US7075743B2Jul 11, 2006
Method of servo writing for magnetic recording system, magnetic recording system
HITACHI GLOBAL STORAGE TECH12 citations84
US7076721B2Jul 11, 2006
Data recording/readback method and data recording/readback device for the same
HITACHI GLOBAL STORAGE TECH9 citations74
US7817367B2Oct 19, 2010
Apparatus, signal-processing circuit and device for magnetic recording system
HITACHI GLOBAL STORAGE TECH4 citations63
US7545595B2Jun 9, 2009
Magnetic disk apparatus having an adjustable mechanism to compensate write or heat element for off-tracking position with yaw angle
HITACHI GLOBAL STORAGE TECH5 citations63
US7436611B2Oct 14, 2008
Method of servo writing for magnetic recording system, magnetic recording system
HITACHI GLOBAL STORAGE TECH4 citations63
US7296215B2Nov 13, 2007
Signal processing method and signal processing circuit
HITACHI GLOBAL STORAGE TECH2 citations63
US7259929B2Aug 21, 2007
Device and signal processing circuit for magnetic recording, magnetic recording apparatus
HITACHI GLOBAL STORAGE TECH4 citations63
US7213195B2May 1, 2007
Data decoding method and circuit and information recording and reproducing apparatus using the same
HITACHI GLOBAL STORAGE TECH4 citations63
US7092181B2Aug 15, 2006
Magnetic recording apparatus
HITACHI GLOBAL STORAGE TECH4 citations63
US7526716B2Apr 28, 2009
Recording/regenerating device, method of encoding error correction, method of recording data
HITACHI GLOBAL STORAGE TECH3 citations60
US7839590B2Nov 23, 2010
Method of servo writing for magnetic recording system, magnetic recording system
HITACHI GLOBAL STORAGE TECH0 citations52