Active bone-conducted sound sensing for wearable interfaces

Authors:
Kentaro Takemura;Akihiro Ito;Jun Takamatsu;Tsukasa Ogasawara
Affiliations:
Nara Institute of Science and Technology, Ikoma-shi, Nara, Japan;Nara Institute of Science and Technology, Ikoma-shi,Nara, Japan;Nara Institute of science and Technology, Ikoma-shi, Nara, Japan;Nara Institute of Science and Technology, Ikoma-shi, Nara, Japan
Venue:
Proceedings of the 24th annual ACM symposium adjunct on User interface software and technology
Year:
2011

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Abstract

In this paper, we propose a wearable sensor system that measures an angle of an elbow and position tapped by finger using bone-conducted sound. Our system consists of two microphones and a speaker, and they are attached on forearm. A novelty of this paper is to use active sensing for measuring an angle of an elbow. In this paper, active sensing means to emit sounds to a bone, and a microphone receives the sounds reflected at the elbow. The reflection of sound depends on the angle of elbow. Since frequencies of bone-conducted sound by tapping and from the speaker are different, these proposed techniques can be used simultaneously. We confirmed the feasibility of proposed system through experiments.