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. 2020 Mar 13;20(6):1596. doi: 10.3390/s20061596

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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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(a) Raw data from SRS. (b) Extracted heartbeat signal using Savitzky Golay filter. (c) Extracted heartbeat signal using ARLSF. (d) The reference ECG lead I signal. (The units of acceleration and ECG are g and mV, respectively.)