10. The method of claim 1 , wherein if the equal error rate value corresponding to the speech sample is selected as the decision threshold, calculating a standard deviation of the determined ratio of unvoiced frames for the speech sample.
10. The method of claim 1 , wherein if the equal error rate value corresponding to the speech sample is selected as the decision threshold, calculating a standard deviation of the determined ratio of unvoiced frames for the speech sample. 11. The method of claim 10 , wherein the standard deviation associated with the speech sample is based on the ratio of unvoiced frames to the total number of frames in the speech sample and a function that describes a relationship between standard deviations and ratios of unvoiced frames to the total number of frames in a population.