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

Brazil

... found several mountain ranges, amongst which the highest peak is the Pico da Neblina[?] at 3,014 m. Major rivers include the Amazon, the largest river in the world by ...