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. 2018 Aug 6;17:106. doi: 10.1186/s12938-018-0538-9

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — PACF and UACF of heart sound: a is the thresholded heart sound envelope ${\tilde{E}}_{NO}$ ; b is the PACF of a; c is the UACF of a. The peaks that are marked by red circles are primary peaks, while the peaks unmarked are side peaks