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Measurement of Distortions Due to Vertical Tracking Angle Errors in Stereodisk Systems

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A laboratory-constructed pickup permitted adjustment of the vertical tracking angle from -25° to +30°. Using 400 + 4000cps intermodulation bands on stereodisks the harmonic distortion, the amplitude modulation, the IM sideband percentages, and the frequency deviation were measured as a function of the vertical tracking angle. While the results of these measurements were in agreement with some of the theoretical relationships which have been developed for tracking-angle phenomena, certain other aspects of the measurements cannot be explained in terms of existing theory and, hence, indicate a gap in our understanding. In particular, the minimum values for the various measured quantities do not all occur for the same tracking angle. This result has practical implications for the measurement of vertical tracking angles by playback techniques and for the design of playback systems for minimum tracking-angle distortion.

JAES Volume 12 Issue 1 pp. 8-14; January 1964
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