Common
Total harmonic distortion
Measurement of the harmonic distortion present in a signal
Total harmonic distortion
The total harmonic distortion (THD or THDi) is a measurement of the harmonic distortion present in a signal; THD is defined as the ratio of the sum of the powers of all harmonic components to the power of the fundamental frequency. Distortion factor, a closely related term, is sometimes used as a synonym for THD. In audio systems, equipment with lower distortion—such as loudspeakers, amplifiers, and microphones—reproduces an audio recording more accurately. In radio communications, devices with lower THD tend to produce less unintentional interference with other electronic devices. Harmonic distortion can potentially widen the frequency spectrum of the output emissions from a device by adding signals at multiples of the input frequency. For this reason, devices with high THD are less suitable in applications such as spectrum sharing and spectrum sensing. In power systems, lower THD implies lower peak currents, less heating, lower electromagnetic emissions, and less core loss in motors....
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