CD 3-Beam Tracking Scheme
On the top and bottom frames, the central spot B has drifter to one side of the track and the
modulation is greatest in one of the side beams A or C. In the center frame, the central spot B
is correctly located over the track and the modulation from the central spot is a maximum.
Source: "The physics of the compact disc" by John A. Cope, Physics Education 28, 1993.
Last updated May 17, 1999.
Copyright George Watson, Univ. of Delaware, 1996.