from a recording medium formed with a track and pre-pits, the track having a wobble, the pre-pits being in a predetermined phase relation with the wobble of the track. The apparatus comprises a pickup for reproducing a signal from the recording medium; a limiter for limiting an amplitude of the signal reproduced by the pickup in response to a limiting level, and thereby processing the signal reproduced by the pickup into a limiting-resultant signal; a filter for suppressing components of the limiting-resultant signal generated by the limiter, and thereby processing the limiting-resultant signal into a filtering-resultant signal, the components having specified frequencies and being caused by the pre-pits; a phase adjuster for adjusting a phase of the filtering-resultant signal generated by the filter, and thereby changing the filtering-resultantthe track. The apparatus comprises a pickup for reproducing a signal from the recording medium; a first amplifier for amplifying the signal reproduced by the pickup into a first amplification-resultant signal at a gain corresponding to a factor of X, where X denotes a predetermined positive number; a limiter for limiting an amplitude of the first amplification-resultant signal generated by the first amplifier in response to a limiting level, and thereby processing the first amplification-resultant signal into a limiting-resultant signal; a low pass filter for suppressing components of the limiting-resultant signal generated by the limiter, and thereby processing the limiting-resultant signal into a first filtering-resultant signal, the components having specified frequencies and being caused by the pre-pits; first means for generating the limiting level for the limiter in