Some Thoughts on Geometric Conditions in the Cutting and Playing of Stereodiscs and Their Influence on the Final Sound Picture
The influence of various geometric conditions in the cutting and reproducing process is investigated. It is found that stylus contour plays no important role. Axis orientation does play a role; any deviation herein causes cross modulation, ultimately leading to distortion of the original stereophonic soundpicture. Slant and rotation of planes of axes may be disregarded since the resultant difference angles are small enough to be neglected. Finally, the nature of soundpicture distortion caused by such cross modulation is investigated. Amplitude distortion leads to angular shift of the sound sources (panorama distortion), phase relationship of cross modulation components causing increase or decrease in width of the soundpicture (basis-distortion).
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