“…To achieve effectively signal preprocessing for further data analysis, scholars have employed various methods. The methods for preprocessing mainly include various types of digital filters (high-pass filters [5], low-pass filters [6], band-pass Disclaimer/Publisher's Note: The statements, opinions, and data contained in all publications are solely those of the individual author(s) and contributor(s) and not of MDPI and/or the editor(s). MDPI and/or the editor(s) disclaim responsibility for any injury to people or property resulting from any ideas, methods, instructions, or products referred to in the content.…”