Harmonic-distortion definitions

In communications, unwanted frequencies that are generated as multiples of the original frequency due to irregularities in the transmission line. In audio amplifiers, harmonic distortion comes from non-uniform operation (non-linearity) in the amplifier circuits. See harmonic.
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Nonlinear distortion characterized by the output of harmonics in a signal waveform that do not correspond with the input signal waveform. Harmonic distortion is caused by an amplifier, transducer, or other element that malfunctions. See also distortion, harmonic, and noise.
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