Patent ID: 6563666
Filing Date: 2003-05-13
Classification: G11B

Abstract:
A method for controlled excitation of a servomechanism, possessing a head mounted on its distal end, in a disc drive with a low frequency signal, without necessitating the inclusion of a model of the servomechanism's response to the low frequency signal, comprising:a) filtering, with a first low-pass filter, a high frequency input signal, yielding a filtered input signal; b) exciting the servomechanism with the filtered input signal; c) measuring at intervals the responses of the servomechanism to the filtered input signal, yielding measured responses; d) modeling responses of the servomechanism to the high frequency input signal, yielding modeled responses; e) filtering the modeled responses of the servomechanism with a low-pass filter, yielding filtered modeled responses; and f) adjusting the filtered input signal based upon the difference between the filtered modeled responses and the measured responses of the servomechanism.