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目的 精确提取心音包络线,为心音特征的分析创造条件.方法 基于局部关键点提取心音包络.首先计算信号的局部峰谷点,然后对其插值得到心音包络.结果 通过分别与希尔伯特变换法、数学形态法所提取信号包络的比较,证明本方法提取的心音轮廓更加准确,突出了心音包络的时域特征.结论 采用此方法能够准确地获得心音包络,为后续分析奠定了基础.“,”Objective To extract envelope of heart sounds exactly, for the purpose of the further analysis of its characteristics. Methods The way that envelope extraction of heart sounds based on key-points was given. The points of local peak and valley were calculated firstly, and then heart sound envelope was gotten by the interpolation of these points. Results Compared with the envelope extracted by Hilbert-transform and mathematical morphology, respectively, the outline of heart sounds was extracted more accurately, and its time-domain characters were acquired by this method. Conclusion The envelope of heart sound is extracted correctly by this method, which is useful for the further analysis.