Tracking method and apparatus used in helical scan magnetic recording/reproducing system
US5760988A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 13, 1994 |
| Grant date | Jun 2, 1998 |
| Priority date | — |
| Expiry date | Oct 13, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/7826
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A tracking method and apparatus used in a helical scan magnetic recording/reproducing system is based on an automatic tracking control using an envelope detection signal of a reproduced signal. The tracking apparatus is provided with a circuit for controlling the rotation speed of a capstan motor which transports a magnetic tape, a level comparing circuit for making the comparison for the level of an envelope signal of the reproduced signal, a circuit for applying a predetermined deviation to the rotation speed in accordance with the result of comparison, a circuit for detecting a steady speed deviation between a recording apparatus and a reproducing apparatus from a speed deviation signal generated in the process of the automatic tracking control, and a circuit for correcting the speed deviation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.