Equalizer used for magnetic storage device
US4644424A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1984 |
| Grant date | Feb 17, 1987 |
| Priority date | — |
| Expiry date | Dec 21, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/09
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An equalizer equalizes a reproduced waveform reproduced by a thin film magnetic head by reproducing information recorded magnetically on a medium. In the equalizer, the reproduced waveform is delayed to a position of an undershot portion, and is attenuated to an amplitude corresponding to a magnitude of the undershot portion, and the resultant waveform is superposed on the reproduced waveform, to thereby eliminate the undershot portion. Furthermore, by superposing a waveform obtained by inverting the reproduced waveform and amplifying or attenuating the inverted waveform, on the reproduced waveform at a half power position thereof, the width is narrowed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.