Circuit for reading out magnetic record capable of lowering slic

Details Circuit for reading out magnetic record capable of lowering slic Circuit for reading out magnetic record capable of lowering slic

1993-03-10

1994-10-11

Hajec, Donald

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

G11B 509

Patent

active

053552580

ABSTRACT:
A magnetic record readout circuit and a magnetic recording apparatus. A transistor is located at the output side of a comparator for level slice. If the level slice comparator does not output high for the predetermined time or longer, the transistor remains on. A capacitor is placed between the collector of the transistor and ground. When the transistor is off, the capacitor is charged with a current source connected to the transistor collector. When the capacitor is charged, the level slice comparator outputs high. In response to the level slice comparator which outputs high, one of full-wave rectifying circuits located at the input side of the level slice comparator forces a capacitor for peak hold of a full-wave-rectified waveform to be discharged. As the capacitor is discharged, a given slice level lowers.

REFERENCES:
patent: 4480276 (1984-10-01), Batey et al.
patent: 5161071 (1992-11-01), Nakamura
patent: 5163003 (1992-11-01), Kimura
patent: 5231544 (1993-07-01), Matsushige
patent: 5287227 (1994-02-01), Cronch et al.
JP 04-30307 Abstract, "Peak Detection System of Magnetic Disk Device and Recording Medium Format Constitution System", Takagi, May 13, 1992.
JP 61-151456 Abstract, "Method For Testing Magnetic Disk Medium", Okada, Nov. 27, 1986.

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