Record carrier including a servo track having first and second modulated parts representing a data type and a word sync type, respectively, and an apparatus for scanning the record carrier
US6952381B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 10, 2002 |
| Grant date | Oct 4, 2005 |
| Priority date | — |
| Expiry date | Jun 12, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A record carrier has a servo track (4) indicating an information track (9) intended for recording information blocks. 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 word sync element and the data bit element are modulated according to a same predetermined type of modulation of the periodic variation. The effective strength of a modulated element is the number of periodic variations that are substantially different and available for detection of that element. The effective strength of the word sync element and of the data bit element are equal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.