Source Localization in the Presence of Dispersion for Next Generation Touch Interface

We propose a new paradigm of touch interface that allows one to convert daily objects to a touch pad through the use of surface mounted sensors. To achieve a successful touch interface, localization of the finger tap is important. We present an inter-disciplinary approach to improve source localization on solids by means of a mathematical model. It utilizes mechanical vibration theories to simulate the output signals derived from sensors mounted on a physical surface. Utilizing this model, we provide an insight into how phase is distorted in vibrational waves within an aluminium plate which in turn serves as a motivation for our work. We then propose a source localization algorithm based on the phase information of the received signals. We verify the performance of our algorithm using both simulated and recorded data.