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. 2020 Jul 22;20(15):4079. doi: 10.3390/s20154079

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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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Synchronization procedure of the fetal heart rate signals: FHR_E—obtained from the reference direct FECG, FHR_U—determined by one of the methods based on a raw Doppler US signal and FHR_CTG—acquired directly from a fetal monitor output.