Gesture Sensing Uses Sound

Doppler shifts in ultrasonic sound waves can be used to detect gestures. Soundwave uses this technology to turn conventional speakers and microphones on computers into gesture control interfaces.

Gesture Control System Uses Sound Alone – [technologyreview.com]

While other motion-sensing technologies such as Microsoft’s own Kinect device use cameras to sense and interpret movement and gestures, SoundWave does this using only sound—thanks to the Doppler Effect, some clever software, and the built-in speakers and microphone on a laptop.

Desney Tan, a Microsoft Research principal researcher and member of the SoundWave team, says the technology can already be used to sense a number of simple gestures, and with smart phones and laptops starting to include multiple speakers and microphones, the technology could become even more sensitive.

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