Understanding why spectral flatness cannot be computed

1. How is spectral flatness measured?
2. How do you calculate spectral entropy?
3. What is centroid frequency?

How is spectral flatness measured?

The spectral flatness is calculated by dividing the geometric mean of the power spectrum by the arithmetic mean of the power spectrum, i.e.: where x(n) represents the magnitude of bin number n.

How do you calculate spectral entropy?

To compute the instantaneous spectral entropy given a time-frequency power spectrogram S(t,f), the probability distribution at time t is: P ( t , m ) = S ( t , m ) ∑ f S ( t , f ) . Then the spectral entropy at time t is: H ( t ) = − ∑ m = 1 N P ( t , m ) log 2 P ( t , m ) .

What is centroid frequency?

The individual centroid of a spectral. frame is defined as the average frequency weighted by amplitudes, divided by the sum of. the amplitudes, or: ∑ ∑