Acoustic wave touch detection circuit and method

Details Acoustic wave touch detection circuit and method Acoustic wave touch detection circuit and method

2007-07-23

2010-10-12

Abdulselam, Abbas I (Department: 2629)

Telegraphy

Systems

Position coordinate determination for writing

C345S173000

Reexamination Certificate

active

07812269

ABSTRACT:
A circuit for an acoustic wave switch or sensor having a resonant acoustic wave cavity detects a touch or sensed event using a time domain approach. The circuit includes a controller that drives an acoustic wave transducer to generate a resonant acoustic wave in the acoustic wave cavity during a first portion of a sampling cycle. In a second portion of the sampling cycle, the controller monitors the time that it takes for the acoustic wave signal from the transducer to decay to a predetermined level. Based on the decay time, the controller detects a sensed event, such as a touch on the acoustic wave switch/sensor.

REFERENCES:
patent: 5303210 (1994-04-01), Bernstein
patent: 6590757 (2003-07-01), Pahl et al.
patent: 7511704 (2009-03-01), Knowles et al.
patent: 0 657 842 (1995-06-01), None

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