Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1997-06-27
1999-10-12
Huber, Paul W.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 4425, 369 4427, G11B 390, G11B 700
Patent
active
059663570
ABSTRACT:
A disk discrimination method for a digital versatile disk (DVD) system uses a sum signal and a focus error signal as a difference signal obtained from the amount of light detected from divided optical detection areas of a divided-by-eight photodiode in a loaded disk, to discriminate whether a loaded disk is a DVD or compact disk (CD). When offsets of the sum signal and the focus error signal are normal, and are larger than predetermined reference signals, it is judged that the loaded disk is a DVD, while the loaded disk is judged to be a CD when the sum signal and the focus error signal are smaller than the reference signals. When disk type discrimination fails, an optical pickup moves a predetermined number of times to retry discrimination. Such discrimination method increases reliability of the discrimination results.
REFERENCES:
patent: 5003521 (1991-03-01), Yoshida et al.
patent: 5665957 (1997-09-01), Lee et al.
Huber Paul W.
Samsung Electronics Co,. Ltd.
LandOfFree
Disk discrimination method for digital versatile disk system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Disk discrimination method for digital versatile disk system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Disk discrimination method for digital versatile disk system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-658999