Minimum Data For Voice Recognition

I was watching Star Trek Voyager Season 5 episode 1 'Night' It is set in the darkness of a void in space. When all of the lights go out you hear a gasp in the dark... I knew that this tiny gasp was Neelix, but you can't see him. It made me wonder what is the minimum amount of sound data you need to recognise a voice. This was just a gasp, he inhaled quickly.

Pincho Paxton