信号工频数字陷波器设计及对比研究

Design and Comparative Study of Power Frequency Digital Notch Filter

工频数字陷波器广泛应用于地质勘探和医学应用等研究领域。通过对五种典型的数字陷波器设计方法,包括Kaiser窗函数法、频率采样法、巴特沃斯法、切比雪夫和零相位数字滤波法进行算法仿真,并针对叠加了不同幅值噪声的ECG信号的滤波结果进行客观评价,得出不同滤波方法适用的范围。同时设计了信号工频数字陷波器消除分析软件系统,提供一个简单便捷的对比分析平台。

Power frequency digital notch filter has been widely used in various research domains such as geophysical explora-tion,medical applications,and so on.Five classical design methods have been simulated,including Kaiser window function method,frequency sampling method,Chebyshev method,Buttordworth method and zero-phase digital filter method.The filter-ing results,regarding ECG signal with different levels of noise,have been objectively evaluated and a conclusion has also been drawn in regard to the applicability of different methods.Meanwhile,the power frequency noise removal software system has been designed,which provides a simple and convenient environment for analysis and contrastive study.