PRML detector having a viterbi decoder outputting temporary judgement results
US6937551B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 2003 |
| Grant date | Aug 30, 2005 |
| Priority date | — |
| Expiry date | Apr 3, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/1484
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A PRML detector includes a waveform equalizer for equalizing a waveform of a reproduction signal obtained by reproducing marks and non-marks recorded on a recording medium, and a decoder for generating binary-coded data of the reproduction signal based on the waveform equalized by the waveform equalizer. The decoder outputs a temporary data string which is obtained before the binary-coded data is obtained. The waveform equalizer includes an equalizer that includes a delay element that delays propagation of the reproduction signal, a plurality of multipliers that multiply predetermined coefficients by the reproduction signal and the delayed signal from the delay element, and an adder that adds outputs from the plurality of multipliers. A target value judger determines a target value for equalizing based on the temporary data string output from the decoder and a coefficient adaptive controller calculates the predetermined coefficients and adaptively updates the calculated predetermined coefficients for each of a plurality of multipliers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.