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MFCC-GMM training phase: GMM training from MFCCs of each training group. The different colors of the GMM represent the different gaussian functions that compose it. The final GMM (gray curve) models the MFCC distribution of one training group (either male PD, female PD, male control, or female control). VAD, voice activity detection; CMS, cepstral mean subtraction; EM, expectation-maximization.
