Digital servo system having a servo loop, a digital filter including coefficient multiplying means, and coefficient changing means
US5963390A · kind A · utility
2Cited by
8References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 16, 1997 |
| Grant date | Oct 5, 1999 |
| Priority date | — |
| Expiry date | Jun 16, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B15/4673
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digital servo system is provided for controlling a cylinder motor in a video tape recorder. The servo system includes a servo loop and a digital filter inserted in the servo loop. The digital filter includes a coefficient multiplying circuit for multiplying a coefficient. A coefficient changing circuit is further provided for changing the coefficient of the coefficient multiplying circuit. The digital filter is provided to improve the servo gain at a low frequency region. This avoids lag caused by the filter in this region, and advantageously provides resistance to disturbances.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.