Electronic tachometer with variable bandwidth differentiator
US4138728A · kind A · utility
6Cited by
7References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 29, 1977 |
| Grant date | Feb 6, 1979 |
| Priority date | — |
| Expiry date | Jun 29, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/44
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electronic tachometer, for use in a disk drive system, to sense velocity of an accessing head mechanism relative to data tracks being accessed, comprises a first feedback loop comprising a variable bandwidth differentiator for receiving a position signal and providing a velocity signal; and a second feedback loop including the differentiator and means for supplying a control voltage to said differentiator in response to a variable velocity signal provided by the differentiator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.