
A deprecated command replaced by MFCC: To MelSpectrogram....
The output of the triangular filters in a mel filter bank will be reconstructed by applying the inverse cosine transform:
P_{j} = 2/N (c_{0}/2 + Σ_{k=1}^{N1} c_{k} cos (πk(j0.5)/N))), 
where N represents the number of filters, j runs from 1 to N, and coefficients c_{k} with k less than fromCoefficient and k larger than toCoefficient take zero values in the evaluation.
© djmw, October 23, 2014