Methods and apparatus for generating a clock signal, for writing servo tracks, and for characterising timing errors in a servo track writer
US7646557B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 5, 2006 |
| Grant date | Jan 12, 2010 |
| Priority date | — |
| Expiry date | Jan 5, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59677
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of generating a clock signal from a moving medium includes detecting movement of at least one mark that moves synchronously with the medium. A generally sinusoidal output signal corresponding to movement of the mark is produced. The generally sinusoidal output signal is interpolated to provide a clock signal having a higher frequency than said generally sinusoidal output signal. The interpolation dynamically adjusts the phase of the interpolated output clock signal to correct for errors in the phase of said output signal. In one embodiment, servo tracks are written to a magnetic disk using a servo pattern signal, the phase of the servo pattern signal being adjusted relative to a clock signal. In another aspect, timing errors in a servo track writer are characterised.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.