Servo error detection in a noisy environment

Details Servo error detection in a noisy environment Servo error detection in a noisy environment

1996-02-16

1998-10-27

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 53, 360 60, G11B 5584

Patent

active

058285148

ABSTRACT:
An improved and apparatus is provided in a tape drive for servo-controlling a tape head position relative to a magnetic tape as the magnetic tape travels past the tape head thereby reducing track mis-registration on the magnetic tape. Servo elements contained within the tape head detect a lateral displacement of the magnetic tape position relative to the tape head and generate position error signals corresponding to such lateral displacement. The position error signals are then filtered to generate a low frequency position error signal, a midrange frequency error signal, and position reliability signals. The tape head is then positioned by a head actuator according to the low frequency position error signal to adjust to the lateral movement of the magnetic tape. The midrange frequency error signal is compared to a distortion threshold to determine if errors exist due to tape edge vibrations or distortion of the magnetic tape. The position reliability signals are used to calculate an error density, which is then compared to a surface threshold to determine whether a surface defect exists on the magnetic tape.

REFERENCES:
patent: 4432026 (1984-02-01), Coleman, Jr.
patent: 5003413 (1991-03-01), Miyazaki
patent: 5089757 (1992-02-01), Wilson
patent: 5235472 (1993-08-01), Smith
patent: 5258879 (1993-11-01), Shimotashiro et al.
patent: 5309299 (1994-05-01), Crossland et al.
patent: 5394280 (1995-02-01), Chliwnyj et al.
patent: 5574602 (1996-11-01), Baca et al.

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