Method and apparatus for correcting edge interval of record signal in an optical record/read-out apparatus
US5345434A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 1, 1993 |
| Grant date | Sep 6, 1994 |
| Priority date | — |
| Expiry date | Nov 1, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/1258
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a data recording operation, various patterns each having n edge widths (n is an integer), which are considered to appear in the operation, are predicted such that a record pattern sequence including the various patterns is recorded before an actual data recording operation. Using a read-out signal thereof, a shift quantity of each edge of the read-out signal with respect to an inherent edge record position is attained, thereby generating a table containing relationships between the respective patterns and the edge shift quantities. During an actual data recording operation, a record signal of the data is collated in a unit of the n edge widths with the patterns stored in the table so as to correct the edge width.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.