以下为句子列表：
英文: Abstract: Zero-crossing edge detection method was analyzed.
中文: 文摘:讨论二阶导数过零边缘检测方法。
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英文: In this article, double threshold, iteration is applied to improve segmentation algorithm based on signal energy, and Short-time Zero-crossing Rate is proposed for the first time to determine the exact boundaries between different components of heart soun
中文: 本文通过使用双门限、迭代等方法，改进了基于信号能量的分段算法，并首次引入短时过零率以更准确地定位分段边界。
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