Apparatus for maintaining rotational speed in disk reproducing device
US4390977A · kind A · utility
16Cited by
5References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 13, 1981 |
| Grant date | Jun 28, 1983 |
| Priority date | — |
| Expiry date | Nov 13, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/18
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a disc reading device wherein the rotating speed is normally controlled by detecting the synchronizing signal part of a reproduced signal, a second speed control circuit is included for measuring the speed of the disc and controlling the speed to a desired value independently of the detected synchronizing signals. When signal drop-out or the like occurs, the second speed control circuit takes over.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.