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用小波变换时频分析的方法对老年人的第三第四心音进行了分析研究， 在心前区采集心音数据， 为对心音定位， 同步采集了一导心电信号。本研究对３０例正常老年人（年龄在５０～６９岁） 和４０例冠心病老年人（年龄在５３～８５岁） 的第三第四心音数据进行了统计分析， 发现正常老年人Ｓ３的频谱主峰频率与冠心病老年人Ｓ３的频谱主峰频率有明显的差异。由于Ｓ３和Ｓ４的幅度和频率都很低， 用听诊方法常被漏掉。本研究为心脏疾病的诊断提供了新的途径
Using the method of wavelet transform time-frequency analysis, the third fourth heart sound of the elderly was analyzed and studied. The heart sound data was collected in the anterior heart area. In order to locate the heart sound, a cardiac electrical signal was acquired synchronously. In this study, we analyzed the data of the third fourth heart sound of 30 normal elderly (50-69 years old) and 40 elderly patients (aged 53-85 years) with coronary heart disease, and found that the frequency spectrum of S3 in normal elderly The main peak frequency and coronary heart disease elderly S3 frequency spectrum of significant differences. Due to the low amplitude and frequency of S3 and S4, auscultation methods are often missed. This study provides a new way for the diagnosis of heart disease