Then, physiological parameters of heart feature and threshold method are used to locate the first heart sound.
然后应用心脏生理特征参数和阈值方法对第一心音进行了定位。
To achieve this, noise in the PCG signal should be removed, and a segmentation method should be used to locate the first heart sound.
为此，需要消除PC G信号中的噪声，并用分段算法定位第一心音。
The results showed that the first heart sound energy fraction were significantly different in the normal group and the heart murmur group.
试验结果表明，在正常组和返流性心脏杂音组间，第一心音能量分数存在显著性差异。
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