Method of reading optical information in super-resolution
US7957244B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 2008 |
| Grant date | Jun 7, 2011 |
| Priority date | — |
| Expiry date | Aug 14, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/1012
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention relates to the reading of digital optical recordings at very high density (CD, DVD, etc.). Reading is done by a PRML (“Partial Response Maximum Likelihood”) technique which uses a model of analog response to the recording of an isolated information bit. Customarily, the response model is represented by four or five signal samples having standardized levels 1 or 2. To take account of particular phenomena of super-resolution reading, the invention proposes the use of a model having 6 to 10 samples that can take 4 or 5 standardized levels. This model can result from the superposition of two simpler models having only two possible levels of samples taken from 1, 2 and 3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.