Method and apparatus of identifying disc types
US7577072B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 16, 2005 |
| Grant date | Aug 18, 2009 |
| Priority date | — |
| Expiry date | Jul 7, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0006
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Embodiments of a method and apparatus of identifying optical disk types according to the present invention can identify the type of an optical disk (e.g., DVD-RAM, DVD-RAM, or DVD+/−RW) based on comparisons between a plurality of signals. For example, comparisons between the magnitudes of DPD and DPP tracking error signals and their respective reference values can be used. If an optical disk is identified as DVD+RW or DVD−RW, embodiments according to the present invention can further determine whether the optical disk is DVD+RW or DVD−RW. For example, the frequency of a wobble signal resulting from the shape of tracks formed on the optical disk and variables that affect the wobble frequency (e.g., the rotational speed of the optical disk and the current track position) can be used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.