第一心音的强度变化更为重要。
More important is variation in intensity of the first 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。
Then, physiological parameters of heart feature and threshold method are 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。
To achieve this, noise in the PCG signal should be removed, and a segmentation method should be used to locate the first heart sound.
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。
The results showed that the first heart sound energy fraction were significantly different in the normal group and the heart murmur group.
实验证明：利用本文采用的算法及提出的方案，提取第一心音幅值，达到了预期的效果。
It is proved that it is effective to extract the amplitude of S1 using the algorithm and scheme proposed in the paper.
第一心音的幅值是心脏收缩能力的标准度量，心音图(PCG)可以用于心力储备的研究。
The amplitude of first heart sound is a normal measurement of cardiac contractility, and phonocardiogram (PCG) can be used in the study of cardiac contractility reserve.
记录运动前后心脏活动所产生的振动信号，测量第一心音幅值和6分钟步行试验中步行的距离。
The vibration signal from heart activity was recorded, and the walking distance during the 6 minute walk test was measured.
利用数学形态学和归一化香农能量两种方法分别提取了心音的包络，突出了第一心音、第二心音等特征。
Methods: withdraw the envelope of heat sounds by using Mathematic Morphology and normalized Shannon energy, extract first heart sound and the second heart sound.
根据瓣膜原理，第一心音(S1)是在心脏收缩期由二尖瓣和三尖瓣关闭时引起的振动产生的，含有多个频率分量。
According to the valvular theory, the vibrations affected by the mitral and tricuspid valves closure in early systole produce the first heart sound (S1). S1 usually includes many frequency components.
根据瓣膜原理，第一心音(S1)是在心脏收缩期由二尖瓣和三尖瓣关闭时引起的振动产生的，含有多个频率分量。
According to the valvular theory, the vibrations affected by the mitral and tricuspid valves closure in early systole produce the first heart sound (S1). S1 usually includes many frequency components.
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