26. The computer readable medium of claim 25 , 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.
25. The computer readable medium of claim 22 , wherein the acts of: detecting a plurality of candidate features in each of the plurality of frames includes an act of detecting at least one formant; and grouping the plurality of candidate features includes an act of grouping the plurality of candidate features such that each of the plurality of candidate feature sets includes at least one value representative of at least one candidate formant detected in the respective frame.