13. The headset of claim 12 , wherein detecting a start of speech comprises identifying a set of fragments in which the number of fragments individually classified as speech exceeds a threshold as constituting speech.
14. The headset of claim 13 , comprising for sets of fragments identified as speech, at least one of prepending or postpending additional fragments of audio to the respective set for processing, where the additional fragments of audio occurred immediately before or immediately after the audio fragments of the respective set of fragments.