The spectral centroid is a measure used in digital signal processing to characterise a spectrum. It indicates where the "center of mass" of the spectrum is. Perceptually, it has a robust connection with the impression of "brightness" of a sound.[1]
It is calculated as the weighted mean of the frequencies present in the signal,
determined using a Fourier transform, with their magnitudes as the weights:[2]
where x(n) represents the weighted frequency
value, or magnitude, of bin number n, and f(n) represents the center frequency of
that bin.
출처: <https://en.wikipedia.org/wiki/Spectral_centroid>
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