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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 (https://creativecommons.org/licenses/by/4.0/).
(A) Sample 5-min heart rate signal. (B) TQWT coefficients obtained from levels 8 to 13. (C) Frequency response of the TQWT transform with the selected parameters (normalized to have unity gain).