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In this paper we describe a novel interaction method for interacting with mobile devices without the need to access a keypad or a display. A tap with a hand can be reliably detected e.g. through a pocket by means of an acceleration sensor. By carefully designing the user interface, the tap can be used to activate logically similar functionalities on the device, leading to a simple but useful interaction method. We present results of user tests aimed at studying the usability of various tap input based user interface applications.
Ronkainen et al. (Thu,) studied this question.
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