Patent ID: 6445529
Filing Date: 2002-09-03
Classification: G05B

Abstract:
A method for obtaining a corrected servo control signal in a servo control loop, comprising the steps of:obtaining servo data; processing said servo data to obtain at least a servo control signal; substituting a determined corrected servo control signal for the servo control signal if a value of said processed servo data overruns a determined threshold, the determined corrected servo control signal having a value proportional to the determined threshold; calculating a new threshold; substituting the new threshold for the determined threshold; calculating the new threshold as a function of a value of the servo control signal if a value of processed read servo data overruns the determined threshold; and wherein the calculating comprises a calculating of the new threshold from the determine threshold: by increasing or decreasing the determined threshold depending on whether it is a maximum or a minimum respectively, if a value of processed read servo data overruns the determined threshold, and in an opposite case: by increasing or decreasing the determined threshold if it is a maximum and if an absolute value of a difference between the determined threshold and the value of the servo control signal is smaller or greater than a determined &Dgr; value respectively, and by increasing or decreasing the determined threshold if it is a minimum and if an absolute value of a difference between the determined threshold and the value of the servo control signal is greater or smaller than the determined &Dgr; value respectively.