Total harmonic distortion Guide, Meaning , Facts, Information and Description

Total harmonic distortion (THD): Of a signal, the ratio of (a) the sum of the powers of all harmonic frequencies above the fundamental frequency to (b) the power of the fundamental frequency.

Note 1: The THD is usually expressed in percent as distortion factor or in dB as distortion attenuation.

Note 2: Measurements for calculating the THD are made at the output of a device under specified conditions.

Source: from Federal Standard 1037C and from MIL-STD-188

See also

• Audio system measurements

External link

• Conversion: distortion factor to distortion attenuation and THD

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