APPARATUS AND METHOD OF COMPENSATING FOR DISTURBANCE USING LEARNING CONTROL IN OPTICAL RECORDING/REPRODUCING APPARATUS AND OPTICAL RECORDING MEDIUM DRIVE SERVO SYSTEM USING THE APPARATUS AND METHOD

摘要

An apparatus and method of compensating for disturbances using learning control is provided. An optical recording medium drive servo system of an optical recording/reproducing apparatus, the system including an actuator for moving the position of a head for recording data on a recording medium or reproducing t he recorded data from the recording medium, an error detector for detecting the difference between the reference position on the recording medium and the actual position of the head, that is, a position error, a compensator for receiving a value from the error detector and producing a value for driving the actuator, a first memory for storing a control input for compensating for the position error of the actuator due to a periodic disturbance such as eccentricity, a second memory for converti ng the content of the first memory according to phase and storing the converted content, a timing controller for generating addresses for the first memory and addresse s for the second memory according to phase, and an adder for applying the content of t he first or second memory together with the output of the compensator to the actuator. Accordingly, a periodic disturbance component including the eccentricity can be rapidly and effectively compensated for using a previously-learned control resultregardless of a variation in cycle such as a variation in the speed of a spindle due to a variation in the reproduction speed of a recording medium.