Track count estimator for optical storage drives
US6064638A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 7, 1998 |
| Grant date | May 16, 2000 |
| Priority date | — |
| Expiry date | Apr 7, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0006
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A track count estimator is provided for an optical storage device operating in either a CD-ROM mode or a DVD mode during a track seek. The track count estimator includes a state estimator to determine current and predicted estimates of the position and velocity of an optical pickup in the optical storage device according to the following equations: EQU Current Estimate: X(k.vertline.k)=X(k.vertline.k-1)+K(Z(k)-X.sub.1 (k.vertline.k-1)) EQU Predicted Estimate: X(k+1.vertline.k)=Ad.multidot.X(k.vertline.k) The input to the state estimator can be selected from a CD-ROM signal (if the optical device is operating in a CD mode) or a DVD signal (if the optical device is operating in a DVD mode), the selected signal representing a half-track position error. An error signal is then generated which is processed separately in position and velocity portions of the state estimator. The output of the position portion is a track count signal which is used by the optical storage device to determine the position of the optical pickup relative to a destination track. Track counting with the present invention provides higher resolution than conventional methods and is less prone to noise, dropouts an…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.