Method for determining the type of digital versatile disc
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United States of America Patent
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Jun 29, 2010
Grant Date -
Dec 1, 2005
app pub date -
May 25, 2005
filing date -
May 25, 2004
priority date (Note) -
Expired
status (Latency Note)
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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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