harmonic amplifier

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• Harmonic oscillator — This article is about the harmonic oscillator in classical mechanics. For its uses in quantum mechanics, see quantum harmonic oscillator. Classical mechanics …   Wikipedia

• harmonic distortion — noun : distortion in which harmonics of an input signal are produced in an amplifier and appear in the output along with the amplified input signal …   Useful english dictionary

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• Total harmonic distortion — The total harmonic distortion, or THD, of a signal is a measurement of the harmonic distortion present and is defined as the ratio of the sum of the powers of all harmonic components to the power of the Fundamental frequency.Lesser THD, for… …   Wikipedia