Method and device for disc rotation control in an optical...

Details Method and device for disc rotation control in an optical... Method and device for disc rotation control in an optical...

2008-04-01

2008-04-01

Tran, Thang V. (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S053300

Reexamination Certificate

active

10889736

ABSTRACT:
A digital signal processing device is provided for disc rotation control in an optical storage system, which is capable of generating a focusing error signal from light that was reflected by an optical disc loaded in the optical storage system. The digital signal processing device includes a low pass filter for removing a high-frequency component of the focusing error signal to obtain a filtered signal, a direct current level remover for removing a direct current component of the filtered signal to obtain a warp-indicating signal, and a controller for comparing the warp-indicating signal with a predetermined threshold value to determine extent of warping of the optical disc. The controller functions to control the optical storage system so as to limit maximum rotation speed of the optical disc according to result of the comparison made by the controller.

REFERENCES:
patent: 4710908 (1987-12-01), Ohshima et al.
patent: 5862113 (1999-01-01), Tsuyuguchi et al.
patent: 5963517 (1999-10-01), Nakagaki et al.
patent: 6351440 (2002-02-01), Fukuda et al.
patent: 6747924 (2004-06-01), Muramatsu
patent: 6865141 (2005-03-01), Tada et al.
patent: 7257062 (2007-08-01), Li et al.
patent: 2001/0019524 (2001-09-01), Na
patent: 2005/0013221 (2005-01-01), Sato

Affiliated with

Also associated with

Rating

Method and device for disc rotation control in an optical... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and device for disc rotation control in an optical..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and device for disc rotation control in an optical... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3932234