Method for providing improved equalization for the reading of marks on optical data-storage media
US6377529B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 2000 |
| Grant date | Apr 23, 2002 |
| Priority date | — |
| Expiry date | Jun 1, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03624
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method is disclosed for compensating for intersymbol interference on an optical disc. The method includes measuring an intersymbol linear transfer function. The intersymbol linear transfer function substantially describes a linear portion of the effect of intersymbol interference on an optically detected read signal from an optical disc. A partial response target frequency response is divided by the intersymbol linear transfer function to obtain a linear equalization filter response. A read signal from the optical disc is convolved with the linear equalization filter response. This results in the read signal being equalized and containing a controlled partial-response target intersymbol interference. There is also disclosed a method of compensating utilizing a decision feedback equalizer where the target frequency response is either a partial-response or a zero-forcing response.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.