Servo system for video signal recording and playback system
US3959819A · kind A · utility
10Cited by
3References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 20, 1974 |
| Grant date | May 25, 1976 |
| Priority date | — |
| Expiry date | Feb 20, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B19/28
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A servo system for use in a video signal recording and playback apparatus to control rotation of an electric motor which drives a recording medium for the composite video signal. A reference signal generator generates a reference signal having a period equal to an integral multiple of the horizontal synchronizing period of the composite video signal. A servo control circuit controls the rotation of the electric motor in response to any phase difference between the reference signal and a rotational speed signal sensed from and corresponding to the speed of the electric motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.