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Further Thoughts on Geometric Conditions in the Cutting and Playing of Stereo Discs
The theoretical considerations presented in an earlier paper are subjected to further practical analysis. The influences of vertical tracking error, in particular, are investigated (differences in slant). It is established that at high frequencies, where distortion is most annoying, the resulting frequency-independent tracking distortion is overpowered by frequency-dependent tracing distortion. The standardization of a -vertical- cutting angle, which has been suggested by others, is found to be objectionable. It is shown that slanted cutting (artificial cutting angle) limits the allowable recording level. A 10° vertical angle already limits the level by 3 db. A new method of measurement of the separation of stereo pickups is presented. The influence of recorded crosstalk in a normal stereo test record is thus evaded. This methods also allows the determination of the orientation axes of the pickup. The advantages of a direct 45/45° cutter compared to an indirect cut by a matrixed 0/90° cutter are shown.
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