ABSTRACT
Gesture is becoming an increasingly popular means of interacting
with computers. However, it is still relatively costly
to deploy robust gesture recognition sensors in existing
mobile platforms. We present SoundWave, a technique that
leverages the speaker and microphone already embedded in
most commodity devices to sense in-air gestures around the
device. To do this, we generate an inaudible tone, which
gets frequency-shifted when it reflects off moving objects
like the hand. We measure this shift with the microphone to
infer various gestures. In this note, we describe the phenomena
and detection algorithm, demonstrate a variety of
gestures, and present an informal evaluation on the robustness
of this approach across different devices and people