Tape address synchronizing apparatus for video tape recorder
US4663679A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1985 |
| Grant date | May 5, 1987 |
| Priority date | — |
| Expiry date | Nov 18, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B27/323
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A tape address synchronizing apparatus for synchronizing the tape position of a video tape recorder to another tape recorder or to a reference has a tape address generating circuit, a reference address generating circuit, comparators for comparing the tape addresses to the reference addresses, a circuit for generating an acceleration signal or a deceleration signal and a capstan servo circuit controlling a motor which in turn controls the speed of the magnetic tape in the tape recorder which is to be synchronized. When the tape addresses match the reference addresses, the phases of a reference signal used for generating the reference addresses and the phase of a CTL signal recorded on the magnetic tape are compared to one another to further synchronize the phases of the signals to one another. As the phase synchronization involves adjustment in tape position and to prevent the phase synchronizing operation from unsynchronizing the tape address from the reference address, the acceleration/deceleration generating circuit is inhibited whenever the difference between the phases is outside a predetermined value range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.