Controller for an acoustic touch panel

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

1992-06-15

1995-01-10

Chin, Stephen

Telegraphy

Systems

Position coordinate determination for writing

178 19, 345177, G08C 2100

Patent

active

053809599

ABSTRACT:
A controller for an acoustic wave touch panel includes a signal conditioning circuit that can generate X-axis and Y-axis burst drive signals for a touch panel as well as receive and process X-axis and Y-axis sense signals from a touch panel that 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 signal conditioning circuit includes a resonant circuit, in each of the X and Y channels, that forms a series resonant circuit through which a burst signal is applied to generate the transducer drive signal. The resonant circuit further forms a parallel resonant circuit of high impedance.

REFERENCES:
patent: 3683327 (1972-06-01), Johson et al.
patent: 3882831 (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
patent: 5072427 (1941-10-01), Knowles
patent: 5177327 (1993-01-01), Knowles
IEEE (Electron Letters), Dieulesaint et al., 30 Oct. 1991, Entire Document.

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