Method and apparatus for automatic sector format identification in an optical storage device
US6285637A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 1998 |
| Grant date | Sep 4, 2001 |
| Priority date | — |
| Expiry date | Dec 11, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/12
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for automatically identifying the format of a sector in an optical storage device. Information on an optical disc is separated into data and subcode streams. The type of optical data is identified, and a first signal is generated to represent the type. Next, if the type is CD-ROM, the mode is identified, and a second signal is generated to represent the mode. Thirdly, if the mode is Mode-2 CD-ROM, the form is identified, and a third signal is generated to represent the form. A single signal may also be used to represent the type, mode, and form. In a CD embodiment, the type is identified by polling a type indicator bit, the mode is identified by polling the mode indicator bits, and the form is identified by comparing a first set of subheader bytes to a second set of subheader bytes, and polling a form indicator bit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.