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. 2017 Aug 10;17(8):1844. doi: 10.3390/s17081844

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© 2017 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 (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Voltage output from one of the 16 tactile units; (b) result of the algorithm application using a 40 ms window for the ON/OFF signal computation; (c) result of the algorithm application using a 30 ms window for the ON/OFF signal computation; (d) result of the algorithm application using a 20 ms window for the ON/OFF signal computation. The enveloped signal was computed using a 40 ms time window in all subfigures. It is clearly noticeable, from the event detected between 9 and 10 s in the last 2 subplots, that the narrowest the window, the highest is the possibility to detect false positives.