Tracking device
US5359473A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 1993 |
| Grant date | Oct 25, 1994 |
| Priority date | — |
| Expiry date | Sep 15, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/584
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digital tracking device for use in a helical scan type magnetic recording and reproducing apparatus with an ATF system utilizing four-frequency pilot signals includes a sampling circuit which samples reproduced pilot signals with a frequency of a predetermined one of the four pilot signal frequencies, digital filter circuits for deriving aliasing signal components of the predetermined pilot signal produced by the sampling circuits, and a feedback circuit for feeding back a tracking error signal corresponding to signal levels of the aliasing signal components derived by the digital filter circuits to a magnetic tape drive system of the recording and reproducing apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.