THD (Total Harmonic Distortion)

Total Harmonic Distortion (THD) measures the degree to which an electrical signal, such as audio or power, contains unwanted frequencies called harmonics. These harmonics are multiples of the original signal’s frequency and can cause sound quality degradation or inefficiencies in electrical systems. THD is expressed as a percentage; lower THD indicates a cleaner, more accurate reproduction of the original signal. For example, in audio systems, low THD results in clearer sound, while high THD may introduce distortion or noise. Overall, THD helps evaluate the fidelity and quality of electronic devices and signals.