Level controlled readout system for formatted record recorded on an optical disc
US4672596A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 1984 |
| Grant date | Jun 9, 1987 |
| Priority date | — |
| Expiry date | Jun 26, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention relates to the reshaping of a read signal in such a manner as to compensate for possible distortions, in particular of its cyclic ratio. During a time interval selected by a control device as as function of synchronizing data present on the disc, the synchronizing information is integrated by means of an integrator. The voltage threshold obtained is compared with the data read by means of a comparator circuit. The result of the comparison gives rise to a signal of rectangular form. This signal may usefully serve the purpose of adjusting the phase of the read system. The device may be utilized in particular in a device for rephasing the clock emitting the read pulses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.