Capstan speed control system
US4078193A · kind A · utility
6Cited by
3References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1976 |
| Grant date | Mar 7, 1978 |
| Priority date | — |
| Expiry date | Apr 21, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S388/912
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic tape-transport system wherein the speed of a capstan used to transport magnetic tape past a read-write head is controlled utilizing digital techniques. A comparator is provided a first digital input indicative of desired speed and a second input from a counter which counts up or down until the count equals the first digital input. The counter output is converted to an analog voltage and applied to a summing junction point which also receives a voltage which is proportional to the instantaneous speed of the capstan drive motor. The voltage difference at the summing junction point is used to drive the capstan drive motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.