Since C.E. Shannon proposed the “information entropy” in 1948, the entropy measures have achieved encouraging progresses in the complexity analysis for biomedical signals. Later with the guidance of “information entropy”, many measures, such as Kolmogorov entropy, approximate entropy, dynamic approximate entropy, sample entropy, mode entropy, multiscale entropy, base scale entropy, joint entropy, fuzzy entropy, fuzzy measure entropy, were proposed and they greatly promoted the level of biomedical signal analysis. In this paper, the history of entropy theory and its role in biomedical signal analysis were reviewed. This paper systematically summarized the four development phases of entropy theory: origin, development, prosperity and status quo. Meanwhile, there was also a detailed analysis for the reasons and defects of each entropy algorithm.
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