Controller for an acoustic wave touch panel

Details Controller for an acoustic wave touch panel Controller for an acoustic wave touch panel

1992-11-06

1994-08-02

Chin, Stephen

Telegraphy

Systems

Position coordinate determination for writing

345177, 367907, G08C 2100

Patent

active

053348052

ABSTRACT:
A controller for an acoustic wave touch panel includes a signal conditioning circuit that can receive and process X axis and Y axis sense signals from the touch panel where the touch panel can be configured with either one or two transducers per sense axis. The signal conditioning circuit includes a differential amplifier to which simultaneously received X axis and Y axis sense signals are applied to provide common mode rejection. The controller also includes a touch position detector that accurately determines the position and pressure of a touch without jitter, the touch position detector including a software low pass filter and peak detector for analyzing the output of the signal conditioning circuit.

REFERENCES:
patent: 3673327 (1972-06-01), Johnson et al.
patent: 3860874 (1975-01-01), Malone et al.
patent: 3883831 (1975-05-01), Williamson et al.
patent: 4644100 (1987-02-01), Brenner et al.
patent: 4746914 (1988-05-01), Adler
patent: 4791416 (1988-12-01), Adler
patent: 4880665 (1989-11-01), Adler et al.
patent: 5072427 (1991-10-01), Knowles
patent: 5177327 (1993-01-01), Knowles
IEEE (Electronics Letter), Dieulesaint et al, Oct. 30, 1991, Entire document.

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