Record carrier having an improved modulated servo track for more reliable synchronization and an apparatus for scanning the record carrier
US7046596B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 14, 2002 |
| Grant date | May 16, 2006 |
| Priority date | — |
| Expiry date | Dec 20, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2562
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A record carrier (1) has a servo track (4) indicating an information track (9) intended for recording information blocks represented by marks. The servo track (4) has a periodic variation of a physical parameter at a predetermined frequency and modulated parts for encoding position information at regular intervals. The modulated parts start with a bit sync element and are of a data type having a data bit element or of a word sync type having a word sync element. The bit sync element and the data bit element are modulated according to a same predetermined type of modulation of the periodic variation. The modulated parts further include modulated parts (40, 41) of an isolated bit sync type only having the bit sync element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.