Encyclopedia > Total harmonic distortion

Article Content

Total harmonic distortion

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 dB.

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

All Wikipedia text is available under the terms of the GNU Free Documentation License

Search Encyclopedia

Search over one million articles, find something about almost anything!

Featured Article

East Marion, New York

... Marion is a town located in Suffolk County, New York. As of the 2000 census, the town had a total population of 756. Geography East Marion is located at ...