Method and apparatus for data recording and reproducing with error reduction
US4908811A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 23, 1988 |
| Grant date | Mar 13, 1990 |
| Priority date | — |
| Expiry date | Sep 23, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/1879
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disk data recording and reproducing apparatus includes variable delay circuits in the recording and reproducing sections of the apparatus. The delay of the reproducing section delay circuit is adjusted when the error ratio determined for a reproduced data signal corresponding to a recorded data signal is greater than a predetermined value. When the error ratio is less than the predetermined value after adjustment of the delay circuit, the delay of the delay circuit in the recording section is adjusted to match the adjusted delay of the reproducing section delay circuit and the delay of the latter circuit is retured to its original value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.