By MFCC people usually mean plain cesptrum without deltas (13 coefficients). If you need deltas, they are computed on the fly by default, you do not need to do anything special about that.
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$CFG_VECTOR_LENGTH = 13;
Does this mean there is just 13 MFCC coeffcients?
If it is just 13 how can i get 39 MFCC corfficients?
By MFCC people usually mean plain cesptrum without deltas (13 coefficients). If you need deltas, they are computed on the fly by default, you do not need to do anything special about that.