9. The method of claim 8 , wherein the act of detecting includes an act of detecting at least one additional feature selected from the group consisting of: pitch, timbre, energy and spectral slope.
8. The method of claim 7 , wherein the acts of: detecting includes an act of detecting a plurality of candidate formants; and grouping the plurality of candidate features includes an act of grouping the plurality of candidate features into the plurality of candidate feature sets for each of the plurality of frames such that each of the plurality of candidate feature sets includes at least one value representative of each of a first formant, a second formant and a third formant detected in the respective frame.