Optical disk drive

Details Optical disk drive Optical disk drive

2006-07-18

2009-08-04

Nguyen, Hoa T (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S047100

Reexamination Certificate

active

07570570

ABSTRACT:
An address is reliably demodulated when a phase shift in a wobble signal has been induced by a crosstalk signal from an adjacent track. Address information is modulated by a binary phase modulation scheme and embedded into an optical disk as a wobble signal. A 0-degree phase wobble signal and a 180-degree phase wobble signal are brought out of phase with each other by crosstalk from an adjacent track. An address decoder performs exclusive-OR operation of the wobble signal and a reference clock signal, to thus compute a ratio at which an exclusive-OR result assumes a value of 1 (H) every half period of the reference clock signal. The thus-computed ratio is compared with a threshold ratio. The threshold ratio is usually set to 50%. However, when a phase shift has been caused by crosstalk, a system controller changes the threshold ratio to a ratio of 50% or less.

REFERENCES:
patent: 7099244 (2006-08-01), Nakata et al.
patent: 7120110 (2006-10-01), Mashimo
patent: 7221629 (2007-05-01), Hayashi et al.
patent: 2004/0071057 (2004-04-01), Ohta
patent: 2004/0165497 (2004-08-01), Hirayama
patent: 2004-095181 (2004-03-01), None
patent: 2004-134002 (2004-04-01), None
patent: 2005-4889 (2005-01-01), None
Notice of Grounds for Rejection (JP) dated Mar. 18, 2008, issued in corresponding Japanese Application No. 2005-209268.

Affiliated with

Also associated with

Rating

Optical disk drive does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical disk drive, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical disk drive will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4062250