Computers generally sense human movements by seeing or feeling it. But this Microsoft research project suggests that your devices may soon be able to hear your gestures through ultrasonic waves.
mashable.com/2012/05/07/gesture-control-system-sound/
The Sound of Movement
Computers generally sense human movements by seeing or feeling it. But this Microsoft research project suggests that your devices may soon be able to hear your gestures through ultrasonic waves.