Devices can be made more intelligent if they can sense their surroundings and physical configuration. However, adding special purpose sensors increases size, price and build complexity. Instead, we use speakers and microphones already present in a wide variety of devices to open new sensing opportunities. Our technique sweeps through a range of inaudible frequencies, allowing us to deduce information about the immediate environment. We offer several example uses, two of which we implemented as self-contained demos, and conclude with an evaluation that quantifies their performance and demonstrates high accuracy.
Gierad Laput, Xiang 'Anthony' Chen, and Chris Harrison. 2016. SweepSense: Ad Hoc Configuration Sensing Using Reflected Swept-Frequency Ultrasonics. In Proceedings of the 21st International Conference on Intelligent User Interfaces (IUI '16). ACM, New York, NY, USA, 332-335. DOI=http://dx.doi.org/10.1145/2856767.2856812