Auto-tracking system for magnetic recording/reproducing apparatus
US5255134A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 1991 |
| Grant date | Oct 19, 1993 |
| Priority date | — |
| Expiry date | May 16, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B15/4676
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An auto-tracking system for a helical scan type magnetic recording/reproducing unit comprises a synchronizing signal separating circuit from video signals on a running magnetic tape reproduced by a rotary video head, a periodicity variation measuring and comparing circuit in the synchronizing signals separated in the synchronizing signal separating circuit, and a tracking control means which controls the running condition of the magnetic tape with reference to a phase difference between a reference signal in association with the rotary video head and a signal representing the running condition of the magnetic tape and changes tracking by a predetermined amount in response to the periodicity variation measured by the measuring and comparing circuit so as to minimize the periodicity variation measured by the same, thereby an optimum tracking position is obtained without being interfered by cross-talks between the adjacent tracks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.