Information recording medium, and information reproducing apparatus and method

摘要

An optical disc (1) has a spiral track. A record mark is formed along the track. Wobble, which is the meandering of the track, is determined from a wobble signal (WB). On the optical disc, the record mark is formed with it displaced according to the wobble signal. The wobble signal is modulated such that a DC offset of the wobble signal is cancelled by a symbol unit of predetermined data. Therefore, in tracking servo upon reproducing, the position of an optical pickup (202) can be converged onto the amplitude center of the wobble in a short time. <IMAGE>