Method and apparatus for process control, tension control, and testing of magnetic media
US5408505A · kind A · utility
126Cited by
7References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 29, 1993 |
| Grant date | Apr 18, 1995 |
| Priority date | — |
| Expiry date | Oct 29, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2211/007
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus is disclosed for using the remanent noise of a magnetic medium as a fingerprint for benchmark testing of the magnetic medium as it is both manufactured and used. A cross-correlation is made between the fingerprint at various times as the magnetic medium is manipulated and is indicative of the integrity thereof. This cross-correlation media may be used to control manufacturing and recording processes, including tape tensioning and channel equalization. This cross-correlation between fingerprints can be used to control the tension applied to a thin film magnetic medium during record and/or playback.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.