The unwanted change in the shape of a waveform is referred to as modulation.

Name: The unwanted change in the shape of a waveform is referred to as modulation.
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The unwanted change in the shape of a waveform is referred to as distortion, not modulation. Modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a modulating signal that typically contains information to be transmitted.

The Unwanted Change in the Shape of a Waveform Is