a type of non-linearity distortion characterized by the production of output components with frequencies which are integral multiples of the frequency of the sinusoidal input signal
The presence of harmonics in the output signal of a device which were not present in the input signal.
The addition of harmonics that was not present in the original signal
Acoustic distortion characterized by unwanted changes between input and output at a given frequency. (Acoustics)
When harmonics are present in an output signal which weren't a part of the input signal of an audio device, this is referred to as harmonic distortion. The addition of harmonics that were not present in the original signal. The presence of harmonics in the output signal of a device which were not present in the input signal.
Harmonic distortion refers to aberration of waves in alternating current caused by electromagnetic interference. This interference is most frequently the result of proximity of operational microprocessors (such as those found in desktop computers). Harmonic distortion can cause a variety of technical issues, including random tripping of breakers, v...The presence of frequencies in the output of a device that are not present in the input signal. The additional frequencies are multiples of components of the input signal
The presence of harmonics that change an AC waveform from sinusoidal to complex.
Condition associated with the critical speed of the shaft in a turbine.
Distortion of a signal by adding content that is harmonically related to the original signal. Clipping overload of an amplifier adds odd-order harmonics to the signal. 
The presence of any unwanted frequencies which are harmonically related to the intended fundamental frequency in an AC voltage or current
A type of communications line interface that is caused by erroneous frequencies that are generated by non-linearities in the system. 
A type of Distortion in which resonance or sympathetic ringing vibrations are added to the original