[Speech] MFCC feature processing

The MFCC feature extraction process is briefly illustrated in the following figure:

1) The time sequence signal is first split into overlapping windows, then Hamming weights are applied on each window;

2) Short Time Fourier Transforms are applied for each window to get the spectrum;

3) Mel-filters are applied to those spectrum;

4) With Cepstral Analysis, the Cepstral coefficients are computed, which is the Mel Frequency Cepstral Coefficients (MFCC).

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