15. The method of claim 12 , wherein step (b) further comprises: obtaining a total likelihood score α r for each audio file of the plurality of speech audio files.
15. The method of claim 12 , wherein step (b) further comprises: obtaining a total likelihood score α r for each audio file of the plurality of speech audio files. 17. The method of claim 15 , wherein the average frame likelihood score of an audio file is obtained using the mathematical equation: β r = α r f r wherein β r is the average frame likelihood score, α r is a total likelihood score of the audio file, and f r is a number of feature frames of the audio file.