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:
Nov. 27, 2007
Filed:
Dec. 09, 2004
Hsin-chung Yeh, Taipei Hsien, TW;
Jin-chuan Hsu, Hsin-Chu Hsien, TW;
Yung-chih LI, Taipei Hsien, TW;
Chao-hsing Tseng, Taipei, TW;
Hsin-Chung Yeh, Taipei Hsien, TW;
Jin-Chuan Hsu, Hsin-Chu Hsien, TW;
Yung-Chih Li, Taipei Hsien, TW;
Chao-Hsing Tseng, Taipei, TW;
Mediatek Inc., Hsin-Chu, TW;
Abstract
A device for canceling a land-groove offset component of a focusing error signal in an optical storage system includes first and second circuits, and an adder. The first circuit processes a radio (or wobble) frequency ripple signal to obtain a first processed signal that is multiplied by a first gain value (G) so as to result in a first signal. The second circuit processes a tracking error signal to obtain a second processed signal that is multiplied by a second gain value (G) so as to result in a second signal. The adder is coupled to the first and second circuits, and adds the first and second signals to produce a compensative land-groove offset component that is to be fed into a focusing device of the optical storage system so as to enable the focusing device to cancel out the land-groove offset component of the focusing error signal.