Magnetic recording and reproducing apparatus with reproducing he

Details Magnetic recording and reproducing apparatus with reproducing he Magnetic recording and reproducing apparatus with reproducing he

1992-08-03

1994-11-22

Hajec, Donald

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

360113, G11B 503, G11B 5127, G11B 533

Patent

active

053674111

ABSTRACT:
A magnetic recording and reproducing apparatus, comprising a magnetic recording medium, a head arrangement for reading data from or writing data on the magnetic recording medium including an inductive recording head and a magnetoresistive reproducing head, and a phase discriminating circuit for discriminating data `1` from peaks of a waveform reproduced by the head. The phase discriminating circuit has a differential circuit for differentiating the waveform, a pulse circuit for producing a zero cross pulse from a zero-level crossing point of the differentiated waveform, a discriminating circuit for discriminating `1` and `0` of the data with use of pulses output from the pulse circuit and a discriminating window needed for judgment of `1` and `0` of the data, and a decoding circuit for decoding and feeding out the data output of the discriminating circuit. The head comprises a recording head of inductive type, and a reproducing head of magnetoresistive type. The phase discriminating circuit comprises a circuit for controlling a magnetic bias level for the magnetoresistive reproducing head so that a change of resistance of the magnetoresistive reproducing head due to magnetic field is made virtually equal both at positive and negative polarity waveform peaks.

REFERENCES:
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patent: 4774601 (1988-09-01), Ouchi et al.
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patent: 4907100 (1990-03-01), Nishiyama et al.
patent: 5008761 (1991-04-01), Nishiyama et al.
patent: 5193034 (1993-03-01), Tsuyoshi et al.

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