Self-adjusting PRML receiver
US7158324B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 2004 |
| Grant date | Jan 2, 2007 |
| Priority date | — |
| Expiry date | Sep 20, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M13/6508
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A partial response maximum likelihood (PRML) data detecting in a magnetic recording storage device is carried out with a preliminary measuring of write-read channel responses to all nonzero binary combinations of a given length. Decoding of the user data is performed according to a Viterbi algorithm, where the previously measured responses are used as expected samples for branch metric calculations. The measurement of the write-read channel responses and the decoding of the user data are fulfilled by a self-adjusting PRML receiver that contains a controllable clock recovery, a responses accumulator and an adjustable Viterbi detector. The controllable clock recovery produces a set of read-back signal samples containing exactly one sample per bit with or without phase error correction. The responses accumulator calculates averaged responses of the write-read channel. The adjustable Viterbi detector reconstructs the user data that were written to the disk.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.