Digital phase servo system
US4206485A · kind A · utility
11Cited by
5References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 25, 1977 |
| Grant date | Jun 3, 1980 |
| Priority date | — |
| Expiry date | Oct 25, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S388/901
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a digital servo system suitable for controlling the rotational phase of a rotating body, such as, the rotary head drum of a video tape recorder (VTR), a binary output signal is provided, as a phase error signal, based upon the phase relation between a reference signal and a command signal showing the rotational phase of the rotary head drum, and such binary output signal is used to process a motor drive signal. Further, an analog servo system is used in association with the digital servo system to provide highly accurate correction of both high and low frequency phase errors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.