Confusion matrices depicting the correct and misclassification rates of the six transformation models trained and validated using separate train and test samples, (number of test samples n = 8). (a) PCA transformed raw MFCC, (b) PCA transformed standardized MFCC, (c) LDA transformed raw MFCC, (d) LDA transformed standardized MFCC, (e) t-SNE transformed raw MFCC and (f) t-SNE transformed standardized MFCC.