Magnetic disk system having servo signal detecting function depe

Details Magnetic disk system having servo signal detecting function depe Magnetic disk system having servo signal detecting function depe

1995-06-05

1997-11-04

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 67, 360 65, 360 46, G11B 5596

Patent

active

056846517

ABSTRACT:
Servo data respectively recorded in the peripheral and innermost tracks of a magnetic disk at low and high densities in synchronism with a predetermined write period are read back and binarized by the magnetic head as flux reversal patterns. In this case, on the basis of a table stored in the EEPROM in advance, the filter characteristic of a characteristic variable type low-pass filter is variably set to be a characteristic defined by a low cutoff frequency fc and a small boost amount in the peripheral zone and to be a characteristic defined by a high cutoff frequency and a boost amount, which is large on a high-frequency side, on the central zone. The peak waveforms of a servo signal in the central side are raised to be sharpened, and a qualification level in a pulse decoder is variably set to be high in the outermost tracks and to be low in the innermost tracks. The low-pass filter receives a servo signal output from an AGC amplifier, removes a specific frequency component from the servo signal in accordance with a set filter characteristic, and sends the resultant signal to the pulse decoder as a servo signal. The pulse decoder converts the servo signal, which is uniform in the peripheral and innermost tracks of the disk, into a binary pulse in accordance with the set qualification level.

REFERENCES:
patent: 4564869 (1986-01-01), Baumeister
patent: 4794469 (1988-12-01), Kaida
patent: 5060088 (1991-10-01), Dolivo
patent: 5121262 (1992-06-01), Squires et al.
patent: 5245565 (1993-09-01), Petersen
patent: 5309298 (1994-05-01), Klaasen
patent: 5321559 (1994-06-01), Nguyen
patent: 5438558 (1995-08-01), Ohashi
patent: 5463603 (1995-10-01), Petersen
Magnetic Recording by Mee et al .COPYRGT.1987, pp. 244-248, 302-329.

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