Fig. 1. Distortion in a lateral groove

Published at 800 × 377 in Things I learned on Phono EQ curves, Pt. 4
Fig. 1. Distortion in a lateral groove

source Vertical Sound Records Journal of the Society of Motion Picture Engineers February 1932 p142
横溝記録のレコード再生時に避けられない歪み録音針は進行方向の垂直に同じ幅をキープするが再生針は丸いため接点の垂直方面の幅が変わりこれが再生歪みとなって現れる

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