Waveform equalizer for a reproduction signal obtained by reproducing marks and non-marks recorded on a recording medium
US6934233B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 2003 |
| Grant date | Aug 23, 2005 |
| Priority date | — |
| Expiry date | Jul 25, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/1484
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A waveform equalizer for equalizing a waveform of a reproduction signal. A delay element delays a propagation of the reproduction signal. A plurality of multipliers multiply predetermined coefficients by the reproduction signal and the delayed propagation reproduction signal. A detector detects an asymmetry of the reproduction signal arising from physical profiles of each of the marks and the non-marks, and outputs a detection signal representing an amount of asymmetry. A discriminator outputs a discrimination signal in response to a discrimination of the marks and the non-marks. A calculator calculates a first coefficient multiplied by the reproduction signal of the marks based on the outputted detection signal, and calculates a second coefficient multiplied by the reproduction signal of the non-marks. A selector selects either the first or second coefficient, based upon the outputted discriminating signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.