A command to (re)construct a MelSpectrogram object from the selected MFCC object.
The values Pj in each frame of the MelSpectrogram will be constructed by applying the inverse Discrete Cosine Transform to the corresponding frame of the MFCC object:
|Pj = 2/N (c0/2 + Σk=1N-1 ck cos (πk(j-0.5)/N))),|
where N represents the number of filters that were used to get the MFCC object, j runs from 1 to N, and coefficients ck with k less than fromCoefficient and k larger than toCoefficient take zero values in the evaluation.
© djmw, October 23, 2014