Record carrier with a servo track having wobble with reduced cross-talk and an apparatus for scanning the record carrier
US7113467B2 · kind B2 · utility
3Cited by
5References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 24, 2002 |
| Grant date | Sep 26, 2006 |
| Priority date | — |
| Expiry date | Oct 11, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/10
- 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, this servo track (4) having a periodic variation of a physical parameter. Due to cross-talk, there exists a variation in the wobble signal called wobble beat. The track pitch t and the wobble period p, p being the length of a wobble period, are chosen in such a way that 2πt/p≈n+½ where n is integer. The choice results in a reduced wobble beat. A recording and/or playback device has apparatus for recording/reading the information blocks and for generating a wobble signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.