Scan tracking apparatus for helical scan video tape recorder
US4520410A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 1983 |
| Grant date | May 28, 1985 |
| Priority date | — |
| Expiry date | Feb 28, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/588
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A scan tracking apparatus for a helical scan tape recorder, comprising a movable tape head (11), a detector (13) detecting the envelope of the tape signal to produce a reproduced signal, sampling means (15) for sampling the reproduced signal at fixed points of the helical scan, memory (17) for storing the reproduced signal and correction signals from different tracks of the helical scan, computation means (2) for computing a correction signal to return the tape head to the center of the track, a sawtooth generator (2, 4) for producing a signal related to the tape speed (v), and a head driving mechanism (9) for moving the tape head in response to the sawtooth and correction signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.