Synchronization of symmetric timing based servo bursts
US8054568B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 24, 2010 |
| Grant date | Nov 8, 2011 |
| Priority date | — |
| Expiry date | Feb 24, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/09
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Timing based servo bursts of servo frames, in which the frames are arranged to be symmetric with the same number of servo stripes in each burst of a frame, are synchronized by shifting selected bits. For example, servo frames are arranged with four servo bursts with an equal number of servo stripes in each burst, the servo frames comprising two symmetric sub-frames, each sub-frame comprising two bursts of servo stripes that are parallel to each other within a burst, and the bursts are non-parallel with respect to each other; each servo burst is arranged to comprise at least one reference servo stripe; and each servo burst is arranged to comprise at least one shifted servo stripe, wherein the shift is in the same longitudinal direction with respect to at least one reference servo stripe for each burst of a frame and the opposite longitudinal direction for bursts of sequentially adjacent frames.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.