Goodness of pitch
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Goodness of Pitch is an estimate of harmonic pitch periodicity. High goodness of pitch can be used as a detector of harmonic stack, modulated or not. For example, in the figure below the red arrows indicate harmonic sounds and the blue one a clearly nonharmonic one:
Formal definition: Goodness of pitch is the peak of the derivativecepstrum calculated for harmonic pitch
Units are comparable to amplitude and can be converted to dB by subtracting a baseline and converting to log scale (not implemented in current version). This is a measure of how periodic the sound is. It only captures the 'goodness' of harmonic pitch, whereas both noisy sounds and pure tones give low values. Noisy sounds, however, also give high entropy. Therefore the combination of Wiener entropy and goodness of pitch is useful: 