Qualcomm's Ultrasonic Pen Demo Transcribes From Paper To Device

The pen can be equipped with an actual ink pen or a simple nub, and there's a battery-powered transceiver inside. Using standard, off-the-shelf microphones on a mobile device, your future phone or tablet could pick up vibrations from the pen with a radius of around 30 centimeters.

Underlying Epos software is used to convert vibration and coordinate information into text, and from there, any 'ole text app can be used to field the results. It's a fairly impressive feat, and there's some pretty obvious usage case scenarios here -- this could easily reinvent the art of note taking in class, where those who prefer to jot down reminders on paper will be able to log those same bullet points on their laptop as they scribble.