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Consumer Electronics by S. P. Bali

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TRACING DISTORTION

One form of distortion which occurs with monaural disc recordings is that resulting from the difference in the shape of the recording groove and the rounded playback stylus. The way this distortion arises can best be seen by considering the width of the recording groove.

When no sound is recorded, the groove is unmodulated and the cutting face of the stylus is at right angles to the length of the groove. The width of the groove is uniform and is the full width of the cutting

The stylus will be displaced with a signal, from the unmodulated position and the cutting face is at an acute angle to the direction of the groove. Thus the width of the groove is not uniform. This is illustrated in Fig. 9.11, which shows a sine-wave groove, ...

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