Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2005-04-19
2005-04-19
Hindi, Nabil (Department: 2655)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S053170
Reexamination Certificate
active
06882611
ABSTRACT:
A defect detection method is used to generate a disc defect signal while recording or reproducing information recorded onto an optical disc. The method compares the difference between a reflected light intensity signal (SBAD) and a low-pass filtered SBAD with a predetermined level. A defect signal is generated during a period when the difference exceeds a predetermined value. The defect signal opens a switch to hold the low-passed signal of the SBAD and disconnects the low-pass filter from the SBAD at the moment a defect signal occurs. The held value of the low-passed signal effectively replaces the low-passed signal until the difference between the SBAD and held low-passed signal returns to within the predetermined limits, which re-closes the switch re-connecting the low-pass filter to the SBAD.
REFERENCES:
patent: 5377054 (1994-12-01), Yamaguchi et al.
patent: 5818804 (1998-10-01), Ando et al.
patent: 5841751 (1998-11-01), Komazaki et al.
patent: 6084836 (2000-07-01), Kamiyama
patent: 6172953 (2001-01-01), Kamiyama
Hindi Nabil
Hsu Winston
Media Tek Inc.
LandOfFree
Method and apparatus for defect detection in optical disc... 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 apparatus for defect detection in optical disc..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for defect detection in optical disc... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3439612