Tuesday, August 11, 2009

Acoustic touch sensing

ScratchInput and Stane in the previous post are for gesture recognition. The acoustic sensing technology can be applied to implement touch screens or surfaces. Tai-chi (Tangible Acoustic Interfaces for Computer Human Interaction) is a EU-funded research project that changes ordinary objects to touch sensitive interactive surfaces. Just see a video clip below. In the demo video, the system detects touch (scratching) position using four microphones.

And this video shows a demo of touch gesture recognition.

Commercially, Elo TouchSystems has introduced a touch screen using Acoustic Pulse Recognition (APR), whose sensing technology is similar with that of Tai-Chi.

See also: Tai-Chi – Future Interactive Interface

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