Phase based time domain tracking for helical scan tape drive
US6697209B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 18, 2001 |
| Grant date | Feb 24, 2004 |
| Priority date | — |
| Expiry date | Nov 30, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B15/14
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a helical scan recording system, magnetic tape (31) is transported by a tape transport (98) proximate a rotating scanner (85). The scanner has a pair of read heads (82) mounted thereon, e.g., a first read head and a second read head, which travel in a helical direction on the magnetic tape in view of the transport of the tape and rotation of the scanner. A synchronization detection system (38) determines a first synchronization mark detection time at which a first synchronization mark is read by the first read head from the first track, and a second synchronization mark detection time at which a synchronization mark read by the second read head from the second track. A position error signal generator (100) develops a position error signal (PES) based upon a difference between the first synchronization mark detection time and the second synchronization mark detection time. The servo or transport controller (98) uses the position error signal to develop a servo correction signal for adjusting the position of the read heads. In accordance with one aspect of the present invention, a first distance separating the sync marks along the helical direction of head travel is sufficiently l…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.