PINCH EFFECT
The sine-wave groove of Fig. 9.11 also illustrates the pinch effect which results from the varying width of a modulated groove on a monaural recording. Because of this varying width, the pick-up stylus will have to ride up and down as it traverses the groove, Fig. 9.12.
Fig. 9.11 Illustration of tracing distortion (sine-wave modulation of recording groove is greatly magnified)
At the end of a microgroove recording, the maximum vertical movement may be as much as 11 % of the maximum lateral displacement. The output of some pick-up heads varies slightly with this vertical movement so that pinch effect can be an additional source ...
Get Consumer Electronics now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.