Patent ID: 7560889
Filing Date: 2009-07-14
Classification: G11B,H03H

Abstract:
1. Digital servo system with moving average filter comprising: a servo signal processing unit, servo means controlled by said servo signal processing unit; an analog digital converter for receiving detector signals indicating a deviation from a target of said servo means and providing to the servo signal processing unit samples representing said deviation, wherein said servo signal processing unit comprises: an input filter providing average values of samples at a frequency corresponding to a sample frequency of the analog digital converter and a digital signal processor applied to said input filter for controlling said input filter according to the sample frequency of the control loop frequency of the digital servo system and for calculating and storing filter control states, wherein said servo signal processing unit, for each new sample received from the filter is adapted for calculating a digital signal processor output value as output of the digital signal processor and for calculating and storing the new filter states for the next received sample after providing an output value and before receiving a next sample from the input filter.