What is THD and Total Harmonic Distortion?

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What is THD and Total Harmonic Distortion?

Distortion factor and Total Harmonic Distortion (abbreviated THD) stand for the ratio of unwanted harmonic content (harmonic/non-linear distortion) to the original signal (e.g. the music that is heard through the headphones), whereby the distortion factor refers to the ratio to the overall signal and THD only to the Fundamental component reference. The two quantities are therefore not the same, but they merge into one another for very small values. Non-linear distortions in the headphones or in the headphone amplifier add overtones (harmonics) to the input signal and thus falsify the signal.

Distortion factor and THD are usually specified in percent (%). The lower the value, for example THD = 0.01%, the better the signal fidelity.

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