Automatic head tracking system
US4361857A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 21, 1980 |
| Grant date | Nov 30, 1982 |
| Priority date | — |
| Expiry date | May 21, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/58
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an apparatus for reproducing video or other information signals recorded in successive parallel tracks extending obliquely on a magnetic tape or other record medium which is adapted to be longitudinally advanced, and in which a magnetic head or transducer is movable in the direction generally along the tracks for reproducing the signals recorded therein and is mounted or supported by a bi-morph leaf or other transducer deflecting device which is operative, in response to the reception of an electrical drive signal, for deflecting the transducer or head in a direction transverse to the direction along the tracks, a head movement detector is attached to the transducer deflecting device for providing a head movement signal in correspondence to deflections of the head in said transverse direction, a dithering signal or oscillation is included in the drive signal along with a head position and track selection control signal, and the envelope of the signals reproduced by the head is synchronously detected for generating a track following error signal which is also included in the drive signal; such synchronous detecting of the reproduced signal envelope is effected with the head movem…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.