The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 26, 2008
Filed:
Feb. 17, 2004
Dieter Storz, Lauterbach, DE;
Dieter Storz, Lauterbach, DE;
Thomson Licensing, Boulogne Billancourt, FR;
Abstract
The invention relates to a method and an arrangement for compensating scanning disturbances on optical recording media such as occur in a control loop of a playback or recording unit, in particular as settling amplitude after a disk disturbance and are caused by scratches or dirt on the optical recording medium. In order to compensate the scanning disturbances, a follow-up signal counteracting the settling amplitude is coupled into the control loop as additional offset as a function of the frequency of the occurrence of a disk disturbance for a prescribed time interval. The follow-up signal is coupled into the control loop with a step width that is increased from revolution to revolution on the recording medium until the change in the direction of the settling amplitude of the control loop. Large follow-up signal values are produced in a stepwise fashion in the event of absence of the disk disturbance, in order to avoid large variations in the follow-up signal value. The duration of one revolution of the recording medium, or a shortened time interval up to the individual compensation of a plurality of disturbances during a revolution of the recording medium are provided as time interval for inserting the follow-up signal value. The invention is intended to be applied for playback or recording units of optical recording media.