Inventor
WATT CHARLES R
US45 patents
⚠️ This page may combine multiple inventors who share the name “WATT CHARLES R”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
DPHI ACQUISITIONS INC
38 patentsUS7020054B2Mar 28, 2006
Digital servo system with biased feed-forward
DPHI ACQUISITIONS INC23 citations93
US7196979B2Mar 27, 2007
Calibration storage methods for a digital focus and tracking servo system with calibration
DPHI ACQUISITIONS INC39 citations92
US6809995B2Oct 26, 2004
Digital focus and tracking servo system
DPHI ACQUISITIONS INC23 citations92
US6754151B2Jun 22, 2004
BEMF timing system
DPHI ACQUISITIONS INC26 citations92
US7023776B2Apr 4, 2006
Calibration initiation methods for a tracking and focus servo system
DPHI ACQUISITIONS INC11 citations84
US6958957B2Oct 25, 2005
Digital tracking and focus servo system with TES to FES crosstalk calibration
DPHI ACQUISITIONS INC14 citations84
US6906985B2Jun 14, 2005
Calibration of tracking error signal gain in a tracking servo system
DPHI ACQUISITIONS INC14 citations84
US6813226B2Nov 2, 2004
Calibration of a focus sum threshold in a focus servo system
DPHI ACQUISITIONS INC16 citations84
US7782721B2Aug 24, 2010
Digital focus and tracking servo system with multi-zone calibration
DPHI ACQUISITIONS INC7 citations74
US7079459B2Jul 18, 2006
System and method for performing a spin motor startup operation
DPHI ACQUISITIONS INC10 citations74
US6950380B2Sep 27, 2005
Detector input dark current offset calibration in an optical disk drive digital servo
DPHI ACQUISITIONS INC7 citations74
US6937543B2Aug 30, 2005
Digital focus servo system with a sliding notch filter
DPHI ACQUISITIONS INC7 citations74
US6904007B2Jun 7, 2005
Digital servo system with loop gain calibration
DPHI ACQUISITIONS INC10 citations74
US6891781B2May 10, 2005
Digital servo system with second order compensator
DPHI ACQUISITIONS INC10 citations74
US6885619B2Apr 26, 2005
Detector input stray light offset calibration in an optical disk drive
DPHI ACQUISITIONS INC9 citations74
US6741530B2May 25, 2004
Time critical and non-time critical tasks control system for an optical disk using first and second processors
DPHI ACQUISITIONS INC9 citations74
US7680004B2Mar 16, 2010
Digital servo system with inverse non-linearity compensation
DPHI ACQUISITIONS INC5 citations63
US7260031B2Aug 21, 2007
Digital focus and tracking servo system with one-track jump
DPHI ACQUISITIONS INC6 citations63
US7057983B2Jun 6, 2006
System and method for controlling tracking and seeking in an optical disc drive
DPHI ACQUISITIONS INC2 citations63
US7054242B2May 30, 2006
System and method for controlling focus in an optical disc drive
DPHI ACQUISITIONS INC2 citations63
US7038988B2May 2, 2006
System and method for controlling time critical operations in a control system for an optical disc drive
DPHI ACQUISITIONS INC4 citations63
US6977873B2Dec 20, 2005
System and method to adjust the level of re-calibration effort based on disc drive performance
DPHI ACQUISITIONS INC3 citations63
US6970410B2Nov 29, 2005
Focus detection in a digital focus servo system
DPHI ACQUISITIONS INC6 citations63
US6901040B2May 31, 2005
Kp and Ki lookup system and method
DPHI ACQUISITIONS INC3 citations63
US6891789B2May 10, 2005
Tracking and focus servo system with automatic media type detector
DPHI ACQUISITIONS INC4 citations63
US6885620B2Apr 26, 2005
System and method for recovering from performance errors in an optical disc drive
DPHI ACQUISITIONS INC3 citations63
US6882601B2Apr 19, 2005
Digital servo system with feed-forward control loops
DPHI ACQUISITIONS INC6 citations63
US6847597B2Jan 25, 2005
Optical disk drive with a digital focus and tracking servo system
DPHI ACQUISITIONS INC6 citations63
US6813228B2Nov 2, 2004
Tracking and focus servo system with direction sensor
DPHI ACQUISITIONS INC4 citations63
US6738320B2May 18, 2004
System and method for moving optical pick up from current position to target position with smooth control
DPHI ACQUISITIONS INC2 citations63
US6704261B2Mar 9, 2004
Spin motor control in an optical drive
DPHI ACQUISITIONS INC6 citations63
US7672199B2Mar 2, 2010
Close focus algorithm in a digital focus servo system
DPHI ACQUISITIONS INC1 citations52
US7065018B2Jun 20, 2006
CLV system and method using PSA lookup
DPHI ACQUISITIONS INC1 citations52
US6963524B2Nov 8, 2005
System and method for controlling interrupts in a control system for an optical disc drive
DPHI ACQUISITIONS INC1 citations52
US6958963B2Oct 25, 2005
System and method for handling events in an optical disc drive
DPHI ACQUISITIONS INC1 citations52
US6922380B2Jul 26, 2005
Tracking and focus servo system with anti-skate algorithm
DPHI ACQUISITIONS INC1 citations52
US6898170B2May 24, 2005
PMAD/PSA digital feedback system
DPHI ACQUISITIONS INC0 citations52
US6876609B2Apr 5, 2005
System and method for controlling a spin motor
DPHI ACQUISITIONS INC0 citations52