Videodisc player with constant turntable velocity
US4338683A · kind A · utility
50Cited by
6References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 6, 1980 |
| Grant date | Jul 6, 1982 |
| Priority date | — |
| Expiry date | Nov 6, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B19/24
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a disc record reproducing apparatus for reproducing a disc on which a PCM (pulse code modulation) signal in the form of an RLLC (run length limited code) is recorded, a reproduced PCM signal therefrom is frequency-divided at a constant frequency dividing ratio, a frequency-divided PCM signal is compared with a reference frequency signal, and then the rotation of the disc record is controlled by a compared output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.