7. The speech recognition system of claim 6 wherein the sensed selected facial features comprise upper lip motion relative to lower lip motion, relative mouth corner to corner motion, and relative nose to chin motion.
7. The speech recognition system of claim 6 wherein the sensed selected facial features comprise upper lip motion relative to lower lip motion, relative mouth corner to corner motion, and relative nose to chin motion. 9. The speech recognition system of claim 7 wherein the facial motion deviations are normalized for facial size and relative lip motion deviations are additionally normalized by removing a lip separation distance associated with a non-speech-generating rest condition.