Spectral entropy for audio signals and auditory spectrograms
The spectral entropy is calculated as described in [1]:
where
sk is the spectral value at bin k.
b1 and b2 are the band edges, in bins, over which to calculate the spectral entropy.
[1] Misra, H., S. Ikbal, H. Bourlard, and H. Hermansky. "Spectral Entropy Based Feature for Robust ASR." 2004 IEEE International Conference on Acoustics, Speech, and Signal Processing.