Adaptive tape drive control in a video recorder
US6178286A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 15, 1997 |
| Grant date | Jan 23, 2001 |
| Priority date | — |
| Expiry date | Dec 15, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video recorder capstan drive motor is controlled for slow-motion, freeze-frame and similar operations by setting a rate of acceleration or braking. A speed parameter is measured during an initial acceleration phase and is compared to a predetermined desired value. Based on the result of such comparison, current to the drive motor is limited, or an existing current limitation value is increased or reduced, so as to alter the acceleration or braking and bring the tape speed more nearly to the predetermined value. A representative current value can be stored in nonvolatile storage and used for such current limitation control, for so long as conditions remain unchanged. The value can be changed when conditions change, for example due to loading of a different tape cassette or a change in operational temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.