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本文应用快速付氏换对正常呼吸音进行了谱分析,应用相干函数研究了气管音与肺胞呼吸音的相干性,以及胸部不同部位肺胞呼吸音之间的相干性。结果表明,肺胞呼吸音功率谱值频率增加里指数衰减,其能量主要集中在300Hz以内,气管音功率谱分布在较宽的频带内.在100～500 Hz频率范围内,气管音与肺胞呼吸音之间有较大的相干系数,在500Hz以上的频段内,两者之间相干系数几乎为零。在80～300HZz带内,胸部两个不同部位的肺胞呼吸音的相干系数较小。研究结果表明,气管音与肺胞呼吸音之间有较大的相关性,这两种音足气流与肺、气管等相互作用下产生的白噪声音源在不同声道上的传播至体表的生理声信号。肺胞呼吸音产生与传播与肺局部功能有关,表明了肺胞呼吸音产生传播的局部特性。
In this paper, the rapid Fu’s substitution of the normal breath sound spectrum analysis, the coherence function of the tracheal sound and pulmonary sound of the respiratory sound coherence, and lungs in different parts of the lung respiratory sound coherence. The results showed that the frequency of respiratory sound power spectrum of lungs decreased exponentially, its energy mainly concentrated within 300Hz, and the power spectrum of trachea was distributed in a wide frequency band.In the frequency range of 100-500 Hz, There is a larger coherence coefficient between the breath sounds. In the frequency band above 500 Hz, the correlation coefficient between the two is almost zero. In the 80 ~ 300HZz band, the correlation coefficients of respiratory sounds of lung cells in two different parts of the chest are smaller. The results show that there is a significant correlation between tracheal tone and pulmonary breath sounds, and the white noise generated by these two kinds of foot-stream airflows and lungs, trachea, etc. is transmitted on different channels to the body surface Physiological sound signal. Respiratory lung sound production and transmission and local lung function, indicating that the lungs respiratory sound generated local characteristics of transmission.