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. 2019 Jul 25;19(15):3268. doi: 10.3390/s19153268

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© 2019 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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A new $s_{k}$ with frequency $f_{k} = f_{i} + f_{j}$ is obtained from $s_{i}$ and $s_{j}$ ; scaled factors marked with red colour are discarded.