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Bi-Directional Audio-Tactile Interface for Portable Electronic Devices

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When an audio system uses the screen or casework vibrating as the loudspeaker, it can also provide haptic feedback. Just as a loudspeaker may be used reciprocally as a microphone, the haptic feedback aspect of the design may be operated as a touch sensor. This paper considers how to model a basic system embodying these aspects, including the electrical part, with a finite element package. For a piezoelectric exciter, full reciprocal modelling is possible, but for electromagnetic exciters it is not, unless multi-physics simulation is supported. For the latter, a model using only lumped parameter mechanical elements is developed.

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