Servo signal noise suppression in a sectored servo system by sep

Details Servo signal noise suppression in a sectored servo system by sep Servo signal noise suppression in a sectored servo system by sep

1994-01-18

1995-09-26

Young, W. R.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 65, 360 7707, G11B 5596

Patent

active

054538882

ABSTRACT:
In a hard disk drive of a sector servo type, two low pass filters having different filter characteristics are used. One low pass filter has uniform group delay characteristics to accurately detect the peak positions of data read/written by a user without causing any peak shifts. The other low pass filter has attenuation characteristics representing a high degree of attenuation of signal components having frequencies higher than a predetermined frequency so as to accurately detect the amplitudes of burst data for positioning a magnetic head to the center of a destination cylinder by removing noise.

REFERENCES:
patent: 3483540 (1969-12-01), Damon
patent: 3778787 (1973-12-01), Cannon
patent: 3864741 (1975-02-01), Schwarz
patent: 4152550 (1979-05-01), Takahashi et al.
patent: 4188646 (1980-02-01), Sordello et al.
patent: 4297737 (1981-10-01), Andresen et al.
patent: 5021910 (1991-06-01), Murakami
patent: 5070421 (1991-12-01), Sumiya et al.

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