Method of correcting output waveform of head and magnetic disk unit
US6122119A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 6, 1997 |
| Grant date | Sep 19, 2000 |
| Priority date | — |
| Expiry date | Nov 6, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0018
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of correcting an output waveform of a head includes the steps of (a) obtaining a sample error value of a sample value when subjecting an analog signal output from a head to an analog-to-digital conversion, and (b) correcting a vertical asymmetry of a waveform of the analog signal when carrying out he analog-to-digital conversion by changing a corresponding relationship between the analog signal and a digital signal which is obtained by the analog-to-digital conversion based on the sample error value. The step (b) calculates a correction value with respect to the analog-to-digital conversion based on the sample error value, and changes an input range of the analog-to-digital conversion to become vertically asymmetric depending on the correction value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.