Multi-phase control information detection and signal polarity determination
US7499233B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 2004 |
| Grant date | Mar 3, 2009 |
| Priority date | — |
| Expiry date | Aug 4, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/1403
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Interpreting signals on a noisy channel with polarity uncertainty. A signal processor, such as a read channel transceiver device usable in a magnetic recording system, includes a first detector (e.g., a Viterbi detector) responsive to a readback signal and operable to examine the readback signal at alternative framings based on possible signal polarities of the readback signal, and a second detector (e.g., a servo field detector) responsive to an output of the first detector and operable to find a data pattern that indicates control information (e.g., a servo address mark) in the readback signal and to determine a signal polarity of the readback signal by comparing signal quality information corresponding to the possible signal polarities of the readback signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.