Method for processing a wobble signal
US7289409B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 5, 2003 |
| Grant date | Oct 30, 2007 |
| Priority date | — |
| Expiry date | Sep 5, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2541
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A wobble signal is generated from at least two elementary signals (A,B,C,D) detected by scanning a wobbled track of a data carrier. The invention proposes a solution for eliminating the noise of various origins in the wobble signal, notably the high frequency data leakage into the wobble signal due to radial asymmetry introduced in the diffraction pattern on the detector, whatever the reason for this radial asymmetry. According to the invention, the at least two elementary signals are filtered with at least an adaptive filter (40), and said filtered elementary signals are subtracted (44) from said wobble signal (PP) thereby generating an improved wobble signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.