Method for setting the loop gain in a tracking servo loop

摘要

A method of setting the loop gain of a tracking servo loop of a disc player is disclosed. The optimum loop gain is set for each playing of a disc (1) without being influenced by disc eccentricity. The servo loop is opened, the disc (1) is driven at a revolving speed which is lower than that of normal playback at the current position of the information reading spot (3) and a tracking error signal is obtained. The loop gain is set based on the basis of a plurality of the sample values.