21. The system of claim 16 , the instructions when executed by the processor further comprising functionality for: representing the speech data as a sum of a plurality of amplitude modulation and frequency modulation (AM-FM) models corresponding to a plurality of formants; extracting a plurality of vowel-like speech frames from the speech data; determining one or more dominant formant frequencies based on the plurality of vowel-like speech frames and the plurality of AM-FM models; generating one or more set of filtered speech data by band-passed filtering the plurality of vowel-like speech frames based on the one or more dominant formant frequencies; generating one or more quasi-periodic amplitude envelops from the one or more set of filtered speech data using discrete energy separation algorithm (DESA); and determining a pitch period of the speaker from the one or more quasi-periodic amplitude envelops, wherein the coarse feature of the speaker comprises the pitch period of the speaker.
21. The system of claim 16 , the instructions when executed by the processor further comprising functionality for: representing the speech data as a sum of a plurality of amplitude modulation and frequency modulation (AM-FM) models corresponding to a plurality of formants; extracting a plurality of vowel-like speech frames from the speech data; determining one or more dominant formant frequencies based on the plurality of vowel-like speech frames and the plurality of AM-FM models; generating one or more set of filtered speech data by band-passed filtering the plurality of vowel-like speech frames based on the one or more dominant formant frequencies; generating one or more quasi-periodic amplitude envelops from the one or more set of filtered speech data using discrete energy separation algorithm (DESA); and determining a pitch period of the speaker from the one or more quasi-periodic amplitude envelops, wherein the coarse feature of the speaker comprises the pitch period of the speaker. 22. The system of claim 21 , wherein the pre-determined speaker cluster corresponds to one of male speaker cluster and female speaker cluster.