【摘要】 本文将Ｃｈｏｉ－Ｗｉｌｉａｍｓ分布用于心音信号的分析，研究结果表明该方法清晰地表示了心音信号的各个成分在时频平面的能量分布及动态变化过程，而且可以准确地检测出瓣膜关闭的时刻，为第一心音和第二心音的定位提供了依据。这一结果对于探讨心音产生的物理机制以及研究心脏的生理、病理状况有一定的参考价值。更多还原

【Abstract】 In this paper, the Choi Williams distribution(CWD) is applied to the processing of the heart sound signals. The tests show that the CWD is capable to correctly represent the energy distribution and the transient of the dominant components of heart sound in the joint time frequency plane. The method can accurately pick up the valve’s closing time, and gives a criterion to identify the beginning of the first heart sound and second heart sound. The results of this time frequency analysis are helpful in gaining a better understanding of the mechanism of heart sound, and heart information of physiology and pathology.更多还原