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:
Jul. 21, 2009
Filed:
Jun. 16, 2005
Shih-chang Cheu, Taipei, TW;
Chih-ming Lai, Taipei, TW;
Po-chen Huang, Taipei, TW;
Chih-chung Chiao, Taipei, TW;
Shih-Chang Cheu, Taipei, TW;
Chih-Ming Lai, Taipei, TW;
Po-Chen Huang, Taipei, TW;
Chih-Chung Chiao, Taipei, TW;
Lite-On It Corporation, Taipei, TW;
Abstract
A method for determining a compensation value for tracking error signal in an optical disc drive is disclosed. The optical disc drive rotates a DVD to read data. The DVD has a first reflection layer and a second reflection layer. The first and the second reflection layers have respectively a number of circles of first and second tracks. First, read data on two first and two second tracks and accordingly generate two first compensation values for tracking error signal and two second compensation values for tracking error signal. Next, determine the third compensation value for tracking error signal corresponding to each of the other first tracks according to two of the first compensation values for tracking error signal. Then, determine the forth compensation value for tracking error signal corresponding to each of the other second tracks according to two of the second compensation values for tracking error signal.