Sound Sensitive Virtual Touchpad

Imagine being able to turn any surface into a touch tablet – think of the possibilities. Walls. Tables. Your partner. Hmm… OK, stop thinking about that now and go read about (and watch) how some clever types over in Europe have used sonar type methods to ‘hear’ the location of a writing device on wood. [From Boing Boing]

What’s really interesting about this is that it is another example of technology that could potentially expand the effective size of a small, mobile device without you having to carry something larger. Imagine being able to put a few bluetooth sensors on a wall or table and have your phone or PDA pick up the touch of your finger on that surface? This is similar to the light projection keyboards we’ve already started to see.