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提出了一种希尔伯特黄变换(HHT)与香农能量相结合的包络提取方法,使包络更加平滑,分段更加准确。针对希尔伯特包络不平滑的问题,提出一种希尔伯特黄变换(HHT)与香农能量相结合的包络提取方法,使得所得包络更加平滑;针对经验模态分解(EMD)时采用三次样条插值而造成的端点效应问题,采用镜像闭合端点延拓方法予以解决。实验表明使用提出的新方法可以得到更好的结果。最后对心音信号进行包括心率、S1/S2和D/S在内的医学指标的提取和分析,这为临床上评估心脏储备提供了便利。
A new envelope extraction method based on Hilbert transform and Shannon energy is proposed, which makes the envelope smoother and the segmentation more accurate. Aiming at the problem that the Hilbert envelope is not smooth, an envelope extraction method based on Hilbert transform and Shannon energy is proposed, which makes the envelope smoother. For the empirical mode decomposition (EMD) When using cubic spline interpolation caused by the end effect, the use of mirror closed endpoint extension method to be resolved. Experiments show that using the proposed new method can get better results. Finally, the extraction and analysis of the heart index, heart rate, S1 / S2 and D / S of the medical indicators of heart sound signal, which for the clinical assessment of cardiac reserve has facilitated.