Recording and reproducing apparatus including a tracking apparatus with a steady speed deviation circuit
US6104567A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 28, 1997 |
| Grant date | Aug 15, 2000 |
| Priority date | — |
| Expiry date | Nov 28, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/7826
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A tracking apparatus for a helical scan magnetic recording/reproducing system includes a rotation speed controller for controlling the rotation speed of a capstan motor which transports a magnetic tape, a speed deviation generator for applying a deviation to the rotation speed, an envelope level detector for detecting the envelope level of a reproduced signal, a memory for storing the value of detection by the envelope level detector, and an envelope level comparator for comparing envelope levels before and after the deviation is applied to the rotation speed, whereby the rotation of the capstan motor is controlled so that the envelope level becomes a value in the vicinity of a maximum value. The tracking apparatus further includes a steady speed deviation detector for detecting a steady speed deviation between a recording apparatus and a reproducing apparatus, and a steady speed deviation corrector for correcting the detected speed deviation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.