The special points of the pulse signal, especially the position of the second peak tidal wave, are sometimes not easy to identify. For this reason, this paper designs and develops a tool for identifying the special points of the pulse signal based on the fourth derivative. We use MATLAB to develop a gadget to calculate higher derivatives of each pulse signal. In this process, the S-G filter is taken to smooth the pulse signal and its derivative. With the gadget, we can manually adjust the S-G filter parameters to get the final results. The positions of the first three peaks of each cycle of the fourth derivative are used as estimates of the locations of the special points of the original pulse signal. We use artificial method and the developed tool to find the special points of pulse signal respectively, and compare the difference of the two methods by analysis of variance (ANOVA). The experimental results show that there is no significant difference between the two methods (P<0.05). The tool developed in this paper is able to accurately locate the special points of the pulse signal, which provides support for extracting time domain characteristics of the pulse signal.
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