Pin layer reversal detection
US6909567B2 · kind B2 · utility
5Cited by
4References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 29, 2001 |
| Grant date | Jun 21, 2005 |
| Priority date | — |
| Expiry date | Apr 5, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A circuit to detect pin layer reversal including an input circuit to receive an input signal having a first portion to indicate a pin layer reversal and having a second portion to indicate a servo sync mark, a first servo sync mark detector for detecting a positive servo sync mark from the input signal, a second servo sync mark detector for detecting a negative servo sync mark from the input signal, and a circuit responsive to the positive servo sync mark and the negative servo sync mark to generate a signal to indicate if the servo sync mark has been reversed and to generate a signal to indicate the pin layer reversal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.