Equalization preamble region in digital data storage (DDS) format
US7359132B2 · kind B2 · utility
4Cited by
5References
38Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 12, 2004 |
| Grant date | Apr 15, 2008 |
| Priority date | — |
| Expiry date | Oct 30, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/916
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic tape includes plural diagonal tracks, each storing a preamble sequence close to user data such that a transducer for reading the track reads the preamble sequence immediately before reading the user data. The preamble sequence is such that when the track is read by the transducer the preamble sequence has a power sequence with a power spectrum substantially equivalent to the power spectrum of the user data. An AGC circuit responds to the transducer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.