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TSpectrum.THDN Method
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The total-harmonic-distortion-and-noise computes the sum of sqares of the rest towards the maximum marked peak.

Syntax
C#
Visual Basic
public virtual double THDN(double ActualZeroPadding);
Remarks

All other marked peaks are considered to be noise. Marked peaks are stored in the Marks property. The width of the peaks is determined with the MainlobeWidth property.

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