Harmonic distortion

A distortion is the alteration of the original shape (or other characteristic) of an object, image, sound, waveform or other form of information or representation. Distortion is usually unwanted. In some fields, distortion is desirable, such as electric guitar (where distortion is often induced purposely with the amplifier to achieve the electric guitar's desired, electrifying, aggressive sound). The slight distortion of analog tapes and vacuum tubes is considered pleasing in certain situations. The addition of noise or other extraneous signals (hum, interference) is not considered to be distortion, though the effects of distortion are sometimes considered noise.
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Distortion /dis·tor·tion/ 1. the state of being twisted out of normal shape or position. 2. in psychiatry, the conversion of material offensive to [more]Harmonic distortion - Community and Resources

In the output signal of a device, distortion caused by the presence of frequencies that are not present in the input signal. Note: Harmonic distortion is caused by nonlinearities within the device. (188 )

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