Method and system for synchronizing the movement of plural recording media
US4210939A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 1978 |
| Grant date | Jul 1, 1980 |
| Priority date | — |
| Expiry date | Jun 16, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and system are provided for synchronizing the movement of a first recording medium by a first transport mechanism including a capstan with the movement of a second recording medium by a second transport mechanism also including a capstan, each of the first and second recording media having addressable recording frames identified by frame signals and addresses recorded thereon. The first and second recording media are rewound from respective predetermined addressable frames identified as T.sub.AO and T.sub.BO, respectively. The first recording medium is advanced from its rewound position toward frame T.sub.AO at a fixed speed, e.g., a normal tape advance speed, in a capstan servo-locked condition, and the second recording medium is advanced from its rewound position toward frame T.sub.BO at a selective speed greater than, equal to or less than the fixed speed. Addresses T.sub.A and T.sub.B of the first and second recording media, respectively, are played back as the recording media are advanced. The address differential T.sub.A -T.sub.B is compared with the fixed address differential T.sub.AO -T.sub.BO, or the address differential T.sub.A - T.sub.AO is compared to the addre…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.