与心脏有关的各种疾病的信息常常反映在心音中.心音的改变和心脏杂音的出现,往往是器质性心脏病的最早体征.心音信号是非平稳信号,为全面了解心音信号的特性,文中探讨了短时傅立叶变换和小波分析两种时频分析方法;并利用它们对正常和非正常心音信号进行了分析,通过对比分析结果,比较了各自的优劣.
The structural defects of the heart are often reflected in the sounds that heart produces. Because of the non-stationary of the PCG signal, it is important to maintain its time-frequency character. We discuss the Short-Time Fourier Transform (STFT) method and the wavelet method. Some normal and abnormal heart sounds were analyzed by these methods. We can see the advantage and disadvantage of them obviously from the examples.
周静,杨永明.心音信号的时-频分析[J].重庆大学学报,2004,27(4):159-162.
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