Disc drive servo system
US4486795A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 21, 1982 |
| Grant date | Dec 4, 1984 |
| Priority date | — |
| Expiry date | Dec 21, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/10527
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disc drive servo system for controlling the drive of a disc carrying a binary digital signal wherein the digital signal includes (i) an information signal portion in which the position of an inversion of the digital signal is determined in accordance with an analog information signal and (ii) synchronizing signal portions which include two successive maximum periods of the inversion. The system comprises a timer means for initialing a timing operation upon receipt of an inversion signal and for producing an output signal when no inversion occurs during a time period which is twice as long as the maximum period of the inversion, thereby reproducing a synchronizing signal and ensuring precise control of the disc drive speed even during periods in which the production of a clock signal is not possible.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.