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. 2014 Jan 23;14(2):1918–1949. doi: 10.3390/s140201918

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© 2014 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 18. — Theoretical and experimental directionality graphs for the SoundCompass with a fixed source at 90° with a varying frequency from 500 till 20 kHz. The Blue line marks the 90° angle. The red dotted line marks the directionality obtained by the experiment. (a) The directionality graph for the SoundCompass according to our theoretical model; (b) the experimental directionality graph for the SoundCompass. Directionality in the lower frequencies deviates from the theoretical model.