Dynamic magnetic information storage or retrieval – General processing of a digital signal – Pulse crowding correction
Patent
1990-03-27
1992-11-10
Severin, David J.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Pulse crowding correction
G11B 509
Patent
active
051630036
ABSTRACT:
A data reproducing circuit, and more particularly, a data reproducing circuit which records magnetization reversal patterns corresponding to a written digital signal onto a magnetic recording medium, and converts a received analog signal from the magnetic recording medium into a digital signal. The present invention has a pre-shift circuit to perform peak shift compensation in the recording process, an equalizer to perform peak shift compensation in the reproducing process, and a digital data reproducing circuit to reproduce data by differentiating the equalized signal received from the equalizer and generating a window signal. The equalizer means contains the first equalizer which compensates the peak position shifting in the received analog signal from the magnetic head and outputs the equalized signal used for differentiation, and the second equalizer which corrects the peak level variation of the analog signal and outputs the equalized signal used for window signal generation. Use of these equalizers with the pre-shift circuit assures margins for noises in the reproducing process along with a sufficient peak shift compensation.
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patent: 4553178 (1985-11-01), Lynch
patent: 4607295 (1986-08-01), Uno
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Fujitsu Limited
Severin David J.
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