Calibration storage methods for a digital focus and tracking servo system with calibration
DC CAFC
First Claim
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1. A method of maintaining operating parameters for an optical disk drive, comprising:
- providing a digital signal processor configured to receive digitized optical sensor signals from an optical pickup unit and form a focusing error signal (FES) and a tracking error signal (TES) from the digitized optical sensor signals, the digital signal processor configured with servo algorithms that process TES and FES to adjust focus and tracking in the optical disk drive;
calibrating operating parameters of the servo algorithms to form calibrated parameters;
storing the calibrated parameters; and
operating the servo algorithms with the calibrated parameters.
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Reexamination
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Abstract
A method of storing calibrated optical parameters is presented. In some embodiments, calibrated optical parameters are stored in place of stored parameters. In some embodiments, averages between the calibrated operating parameters and stored optical parameters are stored. In other embodiments, the stored optical parameters are allowed to vary only by a maximum amount. In some embodiments, if the calibrated parameters vary by more than threshold values, then the calibrated parameters are not stored.
95 Citations
18 Claims
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1. A method of maintaining operating parameters for an optical disk drive, comprising:
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providing a digital signal processor configured to receive digitized optical sensor signals from an optical pickup unit and form a focusing error signal (FES) and a tracking error signal (TES) from the digitized optical sensor signals, the digital signal processor configured with servo algorithms that process TES and FES to adjust focus and tracking in the optical disk drive; calibrating operating parameters of the servo algorithms to form calibrated parameters; storing the calibrated parameters; and operating the servo algorithms with the calibrated parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An optical disk drive, comprising:
- an optical pick-up unit;
an analog-to-digital converter coupled to digitize signals from detectors in the optical pick-up unit to provide digital signals;
at least one processor configured to form a focusing error signal (FES) and a tracking error signal (TES) from the digital signals, the at least one processor being configured with servo algorithms that process TES and FES to adjust focus and tracking in the optical disk drive;
wherein the at least one processor executes an algorithm that calibrates operating parameters for the servo algorithms to form calibrated parameters; and
stores the calibrated parameters. - View Dependent Claims (14, 15, 16, 17, 18)
- an optical pick-up unit;
Specification
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Litigation Data
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Current AssigneeRPX Corporation
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Original AssigneeDPHI Acquisitions, Inc.
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InventorsWach, Hans B., Watt, Charles R., Turner, Christopher J., Kadlec, Ron J.
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Primary Examiner(s)Huber, Paul W.
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Application NumberUS09/950,360Publication NumberTime in Patent Office2,024 DaysField of Search369/44.27, 369/44.28, 369/44.29, 369/44.32, 369/44.35, 369/47.5, 369/47.51, 369/47.52, 369/47.53, 369/53.12, 369/53.13, 369/53.14, 369/53.37US Class Current369/44.27CPC Class CodesG11B 7/0945 Methods for initialising se...
