Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2005-05-25
2010-06-29
Chow, Van N (Department: 2627)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S053220, C369S053100
Reexamination Certificate
active
07746745
ABSTRACT:
A method for determining the type of a digital versatile disc (DVD) so that a DVD+ can be distinguished from a DVD−. The main steps for determining the type of a DVD include setting up related parameters, reading a general wobble signal or a wobble signal within the general wobble signal from a DVD to obtain a peak hold value and a trough hold value. The peak and trough hold values of the general wobble signal are read to derive a peak-to-peak voltage. Finally, if the peak-to-peak voltage is greater than a predetermined threshold value, the DVD is classified as a DVD−, otherwise it is classified as a DVD+. Furthermore, a DVD-ROM disc can be determined.
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Chang Ricky
Lu Allen
Chow Van N
Perkins Coie LLP
LandOfFree
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