推导了样本熵的近似估计公式，引入最优窗宽、全局最优窗宽的算法，首次解决了样本熵的估计值不惟一的问题。
What is more, the expression for approximately estimating sample entropy is preserced by introducing optimal window-width arithmetic and the overall optimal window-width arithmetic.
对原始的短时高频心电图（SHFECG）作近似熵计算难以得到稳定、可信的估计值。
It is difficult to gain stable and credible values of approximate entropy(ApEn) for original signals of short-term high frequency electrocardiogram(SHFECG).
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