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:
Mar. 22, 2011
Filed:
Jun. 05, 2007
Chia-wei Liao, Hsinchu County, TW;
Chih-ching Chen, Miaoli County, TW;
Yuh Cheng, Hsin-Chu Hsien, TW;
Ming-jiou Yu, Taipei, TW;
Kuo-jung Lan, Taipei County, TW;
Chun-yu Lin, Taipei County, TW;
Shu-hung Chou, Taipei County, TW;
Chia-Wei Liao, Hsinchu County, TW;
Chih-Ching Chen, Miaoli County, TW;
Yuh Cheng, Hsin-Chu Hsien, TW;
Ming-Jiou Yu, Taipei, TW;
Kuo-Jung Lan, Taipei County, TW;
Chun-Yu Lin, Taipei County, TW;
Shu-Hung Chou, Taipei County, TW;
Mediatek Inc., Hsin-Chu, TW;
Abstract
The invention provides an apparatus for controlling servo signal gains of an optical disc drive. The apparatus adjusts the gains of a plurality of servo signals controlling a servo system of the optical disc drive according to a closed-loop mode or a state-reloading mode whenever the optical disk drive encounters an operating state transition. In closed-loop mode, at least one AGC loop of the apparatus compensates the gains of the servo signals with a selectable bandwidth during a specific period after the operating state transition to accelerate the convergence of the servo signals. In state-reloading mode, at least one AGC loop of the apparatus reloads the previously saved convergence values or pre-determined values as the initial values according to the current operating state immediately after the operating state transition to accelerate the convergence of the servo signals.