Reading circuit used for floppy disk unit

Details Reading circuit used for floppy disk unit Reading circuit used for floppy disk unit

1990-07-25

1992-11-03

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 67, G11B 509

Patent

active

051610710

ABSTRACT:
A reading circuit used for a floppy disk unit capable of reading data by converting data stored upon the surface of a floppy disk in the form of magnetic variations of a residual magnetism into voltage variations by using a magnetic head. While one of the voltage signals read by a magnetic head is differentiated by a differentiating circuit with a predetermined differential property, the other voltage signal is supplied to a level slicer and is output after being converted into rectangular pulses at a predetermined threshold value. The pulse signals are delayed in accordance with a phase shift period caused by a differential of a differentiating circuit. The delayed signals are then delivered to a comparator, which detects a signal output from the differentiating circuit by performing a comparison, so as to activate the comparator intermittently. The pulse signals, a peak value of which is detected by the comparator, are shaped by a pulse shaping circuit, and are output.

REFERENCES:
patent: 3906379 (1975-09-01), Tuhro
patent: 4564870 (1986-01-01), Kitamura
patent: 4686586 (1987-08-01), Dutcher
patent: 4751591 (1988-06-01), Fujimoto

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