ACOUSTIC CONDITION SENSOR EMPLOYING A PLURALITY OF MUTUALLY NON-ORTHOGONAL WAVES

摘要

A touch sensor (3) comprising an acoustic wave transmissive medium having a surface; a plurality of acoustic wave path forming systems, each generating a set of incrementally varying paths through the transmission medium; and a receiver for receiving signals representing the sets of waves, a portion of each set overlapping temporally or physically by propagating in the transmissive medium along axes which are not orthogonal.