多抽样率频率抽样FIR数字滤波器设计

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。

Design of Multirate Frequency-sampling FIR Digital Filter

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.