
A command to create a MFCC object from each selected MelSpectrogram object.
Mel frequency cepstral coefficients c_{k} in each frame of the MFCC object result from the output of a Discrete Cosine Transform on spectral values P_{j} in the corresponding frame of the MelSpectrogram. The following formula shows the relation between the values in each frame:
c_{k1} = Σ_{j=1}^{N} P_{j} cos (π(k1)(j0.5)/N)), 
where N represents the number of spectral values and P_{j} the power in dB of the j^{th} spectral value (k runs from 1 to N).
This transformation was first used by Davis & Mermelstein (1980).
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