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Consumer Electronics by S. P. Bali

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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.

 

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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 ...

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