The researchers have developed ways to control gadgets, such as personal digital assistants (PDAs) and music players, using 3D sound for output and gestures for input.

BBC: NEWS | Technology | 'Body talk' could control mobiles

"Traditionally tablet and phone devices have needed to make a design compromise: choosing between multi-touch, capacitive glass that is responsive to fingertip gestures, or using a resistive display more suitable for stylus input that requires sacrifices in contrast, wear and tear, and need for calibration, " Gittleman said.

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