强迫振荡呼吸阻抗测量中的滤波处理  

The filter processing in forced oscillation respiratory impedance measurements

作　　者：黄敏[1] 许群[1] 李孟荣[1] 陈式苏[1] 

机构地区：[1]温州医学院物理教研室,浙江温州325003

出　　处：《中国医学物理学杂志》2001年第1期49-50,共2页Chinese Journal of Medical Physics

摘　　要：在强迫振荡呼吸系统阻抗Zr8测定中,为去除自然呼吸干扰,我们设计了一种以振荡激发频率为中心的二级窄带通梳状数字滤波器。实验结果表明,与传统的高通滤波器相比,这种滤波器在所测频带上信噪比的提高几乎相同,达6.0dB,从而能正确评估呼吸系统阻抗。In the measurement of the forced oscillation respiratory impedance, we designed a narrow-band second-order bandpass comb filter which is centered at the forced oscillation frequencies for eliminating the interference of spontaneous breathing. The result shows that an increase of signal-to-noise ratio (SNR) reaches 6.0 dB, and keeps it almost constant over the whole frequency band when compared with a conventional high-pass filtering. So we can assess correctly the impedance of respiratory system.

关 键 词：强迫振荡 呼吸阻抗 带通滤波 信噪比 

分 类 号：R318[医药卫生—生物医学工程]