心音信号可以体现心脏各个部分的生理病理信息。对探索及认识心音与心脏各个

心音信号可以体现心脏各个部分的生理病理信息。对探索及认识心音与心脏各个部分的生理及病理状况关系有着重要意义。时频分析对心音这种不平稳信号具有较高的分辨率，本研究利用时频分析方法对心音信号进行特征提取，其理论构思主要流程如下：首先，读取心音信号；其次，利用小波分解方法去除噪声；再次，对信号进行短时傅里叶时频变换分析；最后，对心音信号进行时频域特征提取研究。其研究结果表明正常第一心音频率范围在60～80Hz，持续时间约0.1s。

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结果 (英语) 1: [复制]

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Heart sound signals can reflect the physiological and pathological information of various parts of the heart. It is of great significance to explore and understand the relationship between heart sounds and the physiological and pathological conditions of various parts of the heart. Time-frequency analysis has high resolution for heart sound, which is an unstable signal. This study uses time-frequency analysis to extract features of heart sound signals. The main theoretical conception process is as follows: first, read the heart sound signal; second, use wavelet decomposition The method removes noise; again, the signal is analyzed by short-time Fourier time-frequency transform; finally, the time-frequency domain feature extraction of the heart sound signal is studied. The research results show that the normal first heart frequency range is 60-80Hz, and the duration is about 0.1s.

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结果 (英语) 2:[复制]

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Cardiac signals can reflect physiological and pathological information about various parts of the heart. It is of great significance to explore and understand the relationship between heart tone and physiological and pathological conditions of various parts of the heart. Time frequency analysis has a high resolution for the uneven signal of heart tone, and this study uses time frequency analysis method to characterize the characteristic extraction of heart tone signal, the theoretical idea of which is as follows: First, read the heart tone signal; The results show that the normal first heart audio rate ranges from 60 to 80Hz and lasts about 0.1s.

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结果 (英语) 3:[复制]

复制成功！

Heart sound signal can reflect the physiological and pathological information of all parts of the heart. It is of great significance to explore and understand the relationship between heart sounds and physiological and pathological conditions of various parts of the heart. Time frequency analysis has a high resolution for the unstable signal of heart sound. In this study, the time-frequency analysis method is used to extract the characteristics of heart sound signal. The main process of the theoretical conception is as follows: first, read the heart sound signal; secondly, use wavelet decomposition method to remove noise; thirdly, analyze the signal by short-time Fourier time-frequency transform; finally, carry out time-frequency analysis on heart sound signal Research on domain feature extraction. The results show that the normal first heart sound frequency ranges from 60 Hz to 80 Hz, and the duration is about 0.1 s.<br>

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