9. The method of claim 2 , wherein if no harmonically related group of oscillator peaks can be identified for an analyzed sample of the audio signal, distribute the extracted oscillator peaks into the comparator stack in accordance with a weighted average of the power for oscillator peaks falling within predetermined bands of frequencies.
10. The method of claim 9 wherein the AFDV for an analyzed sample of the audio signal having no identifiable harmonically related group of extracted oscillator peaks represents an unvoiced sound.