Method for determining the type of digital versatile disc
US7746745B2 · kind B2 · utility
Inventors
Key dates
| Filing date | May 25, 2005 |
| Grant date | Jun 29, 2010 |
| Priority date | — |
| Expiry date | Aug 19, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B19/125
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.