Tachometer for deriving average velocity output by sampling position signal
US4329721A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1980 |
| Grant date | May 11, 1982 |
| Priority date | — |
| Expiry date | Feb 11, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/553
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A tachometer for generating a velocity signal in a data disc pack servo system comprising a sampling pulse generator for producing pulses that are spaced from one another by a constant amount representative of a distance increment of radial movement of a servo head in the system, a timer for measuring the time between the sampling pulses, the timer including a clock pulse source and a counter which is started by one sampling pulse and reset by the next succeeding sampling pulse so that the digital output thereof is proportional to time and a computer for computing average velocity by deriving the quotient of the distance increment divided by the time required for the servo head to traverse such distance increment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.