Data reproducing apparatus for eliminating undershoots in the vi

Details Data reproducing apparatus for eliminating undershoots in the vi Data reproducing apparatus for eliminating undershoots in the vi

1991-11-27

1994-04-26

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 65, 360 67, G11B 509, G11B 5035, G11B 502

Patent

active

053072138

ABSTRACT:
A system which records and reproduces a digital signal in the form of a magnetic reversal on and from a recording medium includes a magnetic head for reproducing data recorded on the recording medium; an automatic gain control unit for controlling the reproduced signal so as to have a constant amplitude; an equalizer for processing the output waveform from the automatic gain control unit; a differentiator for changing the output from the equalizer to a differentiated waveform; a low pass filter for limiting the signal band of the differentiated waveform; a low pass filter for limiting the signal band of the equalizer output; a pulser for receiving the equalizer output, the band of which is limited by the low pass filter and the differentiated waveform, the band of which is limited; a differentiator for receiving the output from the automatic gain control unit and producing a differentiated signal from the output signal; an attenuator for attenuating the differentiator output; and a waveform processor for adding the attenuated differentiated signal to the band-limited differentiated waveform and inputting the resulting signal to the pulser.

REFERENCES:
patent: 4580178 (1986-04-01), Wuori et al.
patent: 4900100 (1990-03-01), Nishiyama et al.
patent: 4942485 (1990-07-01), Umehara et al.
patent: 5068753 (1991-11-01), Kanegae

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