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Design and Evaluation of Identifiable Key-Click Signals for Mobile Devices
October-December 2011 (vol. 4 no. 4)
pp. 229-241
Hsiang-Yu Chen, Motorola Corporation, Libertyville
Jaeyoung Park, Purdue University, West Lafayette
Steve Dai, Sandia National Laboratories, Albuquerque
Hong Z. Tan, Purdue University , West Lafayette
As touch based input becomes more popular in mobile devices, there is an increasing need for haptic feedback on key-less input surface. Four experiments were conducted to design and evaluate identifiable emulated key-click signals using a piezoelectric actuator. Experiments I and II assessed the information transmission capacity for the amplitude, frequency, and number of cycles of raised cosine waveforms used to drive the piezo actuators under fixed- and roving-background conditions, respectively. Experiment III estimated the total information transfer for all three parameters. The results were used to reduce the number of stimulus alternatives in the key-click signal set with the goal to achieve perfect identification performance. Experiment IV verified that up to 5 to 6 identifiable key-click signals could be achieved with the experimental setup. The present study outlines an information theoretic approach to conducting identification experiments to guide the design of and to evaluate a perfectly identifiable stimulus set. The methodology can be applied to other applications in need of perceptually identifiable stimulation patterns.

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Index Terms:
Mobile applications, haptic feedback, key click, human information processing.
Citation:
Hsiang-Yu Chen, Jaeyoung Park, Steve Dai, Hong Z. Tan, "Design and Evaluation of Identifiable Key-Click Signals for Mobile Devices," IEEE Transactions on Haptics, vol. 4, no. 4, pp. 229-241, Oct.-Dec. 2011, doi:10.1109/TOH.2011.21
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