Helical scan type magnetic tape reproduction apparatus and magnetic tape reproduction method
US7477475B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 2007 |
| Grant date | Jan 13, 2009 |
| Priority date | — |
| Expiry date | Jul 9, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/588
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Disclosed herein is a helical scan type magnetic tape reproduction apparatus, including: a helical scan type reproduction head capable of moving in the track widthwise direction by displacement of said actuator itself; target time decision means for measuring a period of time from a reference point of time with regard to each of a plurality of markers recorded in a dispersed relationship at predetermined positions on the tracks in advance to the marker by a predetermined number of times, averaging the measurement time periods of the markers and storing the average time periods; and tracking control means for measuring actual time periods from the reference time points with regard to the markers and performing updating control of a control voltage to be applied to said actuator for said reproduction head in accordance with time information of the differences between the target time periods and the actual time periods.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.