Abstract: A method of measuring the level of crosstalk noise in a playback signal produced from a recording disk such as a video disk, first and second signals of mutually different frequencies are recorded in respective sections of a track in a periodically alternating sequence. These first and second signals are also recorded in corresponding sections of at least one closely adjacent track in a periodically alternating sequence which is displaced with respect to the first-mentioned sequence. Playback of the first track is then repetitively performed, with switching selection of portions of the playback signal from the first sections and second sections respectively, and a derivation of levels of a beat component produced during these selected playback signal portions is obtained. The levels of the beat component are measured, and represent crosstalk noise levels.