Data reproduction method and apparatus, disk, and recording/reproduction apparatus, using PRML method
US7830766B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 14, 2007 |
| Grant date | Nov 9, 2010 |
| Priority date | — |
| Expiry date | Aug 14, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2595
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A data reproduction apparatus for reproducing recorded data from an optical disk by using a PRML detection method is disclosed that includes an optical head including a light source, an optical system having an objective lens for condensing light emitted from the light source to the optical disk, and a photodetector for receiving light reflected from the optical disk, a signal generation circuit for generating an RF signal from a signal output from the photodetector, a phase correction circuit for correcting phase distortion of the RF signal when the recorded data are recorded in recording marks arranged with a pitch less than a diffraction limit, a clock extraction circuit for extracting a clock from the corrected RF signal, and a decoding circuit for decoding the recorded data from the RF signal in synchronization with the clock extracted by the clock extraction circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.