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. 2020 Dec 11;10:21797. doi: 10.1038/s41598-020-77994-z

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Spectrograms of heart sounds from the normal subjects (a) and the subjects with VSD (b). The spectrums of sounds or other signals as they vary with time is shown. S1 (empty triangle) and S2 (solid triangle) are observed in the spectrogram of the normal heart sound. Systolic murmur (white arrow) is observed in the spectrogram of the VSD heart sound.