Video tape transport servo for variable tape speed control
US4679098A · kind A · utility
6Cited by
7References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 6, 1986 |
| Grant date | Jul 7, 1987 |
| Priority date | — |
| Expiry date | Mar 6, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B15/4675
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A capstan servo for moving video tape with variable speed during playback controls the tape speed according to time period inputs. The input specifies the number of seconds per hour of program length, for example, that a segment of recorded video information is to be expanded or compressed compared relative to its normal real time playback length. The speed of tape transport during playback is varied by locking the reproduced control track vertical sync signal to a synthesized time adjustable reference signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.