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do FFT, if signal frequency is fin, then 2*fin, 3*fin .. N*fin inside the frequency band (or inband) are harmonic, sum the total power of harmonic, then you get total harmonic power, / signal power is harmonic distortion in db.
Another formula is sqrt(harmonic power)/sqrt(signal power), unit is %.
Hi...
Unless you were develping circuits in Simulink/Simpowersys...
there you'll find blocks realted to Total Harmonic Distortion or discrete Total Harmonic Distortion..
best regards...
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