What is defined as an undesirable alteration in the original waveform of a signal?

The term that describes an undesirable alteration in the original waveform of a signal is distortion. Distortion occurs when the signal is modified in such a way that it no longer accurately represents the original input. This can happen due to a variety of factors, including overdriving the equipment, component limitations, or transmission issues.

Distortion may manifest as changes in amplitude, frequency, or phase of the waveform, resulting in a sound or image that differs from the intended output. It can significantly affect audio and video quality, leading to a less accurate representation of the source material, which can be particularly detrimental in professional audio-visual applications.

Understanding distortion is crucial for anyone working with audio and visual systems, as it helps in setting up equipment properly and ensuring that the highest quality signal is maintained throughout the processing chain.