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. 2018 Jan 17;8:985. doi: 10.1038/s41598-017-18860-3

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© The Author(s) 2018

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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(a) Raw signal on masked area. (b) Dictionary coded signal overlaid on true signal area. (c) Maximum windowed signal overlaid on true signal area. (d) Correlation windowed signal overlaid on true signal area. White arrows denote reverberant echoes, and red arrows denote true signals of smaller amplitude. As shown in the zoomed insets, the signals of smaller amplitude are retained in the correlation-windowed signal (d), compared to (c).