Servo signal recording apparatus, information recording...

Details Servo signal recording apparatus, information recording... Servo signal recording apparatus, information recording...

2009-06-02

2011-11-29

Sniezek, Andrew L (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S075000

Reexamination Certificate

active

08068308

ABSTRACT:
In the apparatus and method of the invention, a servo signal reproduction unit generates a PES from a servo signal reproduced from a magnetic tape, and a frequency conversion unit performs FFT processing of the PES to generate frequency component information. Then, a filter value generation unit generates filter values based on the frequency component information and writes these to a memory. When recording various data signals to the magnetic tape, the filter values are read from the memory and a control filter serving as a notch filter is incorporated into a feedback control for a tracking servo. This enables periodic and narrow-band noise to be removed from a PES, consequently reducing PESs. Accordingly, learning-type optimum notch filter control that allows a magnetic head to follow recording tracks at high speed and with high precision is possible even when the recording track width is reduced and the tape speed is increased.

REFERENCES:
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patent: 6226688 (2001-05-01), Frary
patent: 2002/0163752 (2002-11-01), Peterson
patent: 2004/0105294 (2004-06-01), Kisaka
patent: 2005/0094308 (2005-05-01), Mahnad et al.
patent: 2007/0230033 (2007-10-01), McAllister et al.
patent: 8-030942 (1996-02-01), None
patent: 2004-086959 (2004-03-01), None

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