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. 2020 Sep 18;20(18):5362. doi: 10.3390/s20185362

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© 2020 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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Sliding-window algorithm used to extract LDV signal windows. $W_{d}$ window size, $W_{s}$ =shift length, $W_{o v e r l a p}$ = overlap with a new beat. The green and blue windows denote beat and no-beat samples, respectively. (The LDV signal was smoothed for visualization purposes only).