A controller for an acoustic wave touch panel

Details A controller for an acoustic wave touch panel A controller for an acoustic wave touch panel

G - Physics

08

C

G08C 21/00 (2006.01) G06F 3/033 (2006.01)

Patent

CA 2138164

2138164 9325988 PCTABScor01 A controller (53) for an acoustic wave touch panel (11) includes a signal conditioning circuit (59) that can receive and process X axis and Y axis sense signals (81, 89) from the touch panel (11) where the touch panel (11) can be configured with either one or two transducers (28, 26, 30, 32) per sense axis. The signal conditioning circuit (59) includes a differential amplifier to which simultaneously received X axis and Y axis sense signals (81, 89) are applied to provide common mode rejection. The controller (53) also includes a touch position detector (55) that accurately determines the position and pressure of a touch without jitter, the touch position detector (55) including a software low pass filter (41) and peak detector (40) for analyzing the output of the signal conditioning circuit (59).

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