Tracking distortion as phase modulation

In support of the urgency for establishing a standard for the vertical tracking angle in stereo disc recording, the phase perturbing character of tracking error distortion is shown, and used to calculate the phase and amplitude intermodulation distortion (PIM and AIM) and harmonic distortion arising from tracking errors. These results are compared with those of other authors. Phase cross modulation (PXM) between the stereo channels is demonstrated and offered as the basis for measurement of tracking errors. Psychoacoustic consequences are considered.