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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/).
The detailed flowchart of our proposed method. (step a) Three one-dimensional signals. (step b) Three unsorted independent source components. (step c) The BVP signal. (step d) The filtered signal. (step e) The frequency spectrum of the refined BVP signal.