Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2006-03-21
2006-03-21
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
Reexamination Certificate
active
07016142
ABSTRACT:
An apparatus and method for removing mechanical resonance in a disc drive using an adaptive notch filter. Mechanical resonance harmful to a system is removed by a notch filter that adaptively varies the frequency characteristics of the filter with respect to the mechanical resonance frequency existing in the system. The mechanical resonance removing apparatus using an adaptive notch filter comprises an excitation signal generator, which in a predetermined notch filter adjusting mode generates an excitation signal exciting the system and provides the signal to the system, a resonance frequency estimator detecting a resonance frequency component from a responding signal from the system corresponding to the excitation signal, a notch filter coefficient generator determining coefficients of a notch filter corresponding to the resonance frequency component detected by the resonance detection unit and the notch filter applying the coefficients determined by the notch filter coefficient generator, to remove the resonance frequency of the system.
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Notice of Office Action issued by the Korean Patent Office on Mar. 16, 2005 for Application No. 10-2003-0006498.
Jung Kwang-Jo
Kang Chang-ik
Hudspeth David
Slavitt Mitchell
Staas & Halsey , LLP
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