多抽样率频率抽样FIR数字滤波器设计

Design of Multirate Frequency-sampling FIR Digital Filter

采用多抽样率方法设计频率抽样FIR数字滤波器,可以获得性能优异的滤波器,以消除心电信号ECG中的基线漂移和工频干扰,对目前类似滤波器存在的截止频率不易控制、通带和阻带纹波过大、工频阻带过窄、易受工频波动干扰或消除基线漂移时对ECG的低频部分削得过多等问题,提出了一个较好的解决办法。相对于IIR滤波器或模拟滤波器避免了因非线性相位滤波带来的失真问题。

This paper presents the design of frequency_sampling FIR digital filter based on multirate conception for removal of base_line wander and power_line interference from the ECG . We can design high performance digital filter which can be used to resolve the problems involving present filters, such as difficulty of controlling cutoff frequency ,large ripple in stop_band and pass_band, too narrow stop bandwidth for removing power_line interference, sensitivity to the fluctuation of power frequency, or the low frequency part of the ECG being cut off too much when removing base_line wander. This scheme can also avoid distortion resulting from non-linear filtering when compared with IIR digital filter or analog filter.