Method and System For Correction of Errors
AssigneeKoninklijke Philips Electronics N.V.
InventorYu Zhou
Life of this patent
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Abstract
A method and system for removing periodic disturbances pertaining to turntable and spindle motor errors during recording of a blank optical information carrier. The periodic disturbances are determined in advance and removed only during recording by a repetitive control/learning feedforward control circuit (88).
Claims9
A method for correction of trackrelated errors of an optical information carrier (14) during recording by a recorder, comprising an optical pick-up unit (30) controlled by a servo system (34) arranged to follow tracks prerecorded in said carrier, the method characterized in:
- retrieving information pertaining to periodic disturbances associated with the rotational speed of a drive mechanism or any harmonics thereof relating to the recorder, from a memory of the recorder;
- and
- adding said information to a feedforward control circuit (88) of said servo system (34) to correct for said periodic disturbances during recording.
A system for correction of trackrelated errors of an optical information carrier (14) during recording by a recorder, comprising an optical pick-up unit (30) controlled by a servo system (34) arranged to follow tracks prerecorded in said carrier, said system comprising:
- a memory comprising information pertaining to periodic disturbances associated with the rotational speed of the drive mechanism or any harmonics thereof relating to the recorder;
- and
- a feedforward track control circuit (88) of said servo system (34) to correct for such periodic disturbances during recording.
Dependencies are inferred from the claim text.