心电信号工频干扰陷波器的设计与实现

Design and Implementation of 50 Hz Notch Filter for ECG Signal Power Interference

为了使心电监护装置便携化、低成本,以C8051F362为核心处理器,利用窗函数法设计FIR型滤波器。借助Matlab仿真平台,设计了30 Hz低通滤波器和40 Hz低通滤波器,并将二者级联组合为一个50 Hz陷波器,再采用试探法和零、极点调整法对陷波器的滤波系数进行调整,使其满足心电滤波要求,并能移植到C8051F362单片机上。以MIT-BIH数据库中的多段心电信号为数据源,对本陷波器进行测试,测试结果证明了本算法的有效性和优越性。

Taking C8051F362 as the core processor, designs FIR filter by means of window function method to develop portable and low cost ECG monitoring device. On Mattlab simulation platform, designs 30 Hz and 40 Hz low pass filters, and makes the two cascade combination for a 50 Hz notch filter, then applies the heuristic method and zero, pole adjustment method to adjust the filter coefficient of notch filter, and makes the filter to meet the requirements of ECG filtering and adapt to transplantation to C8051F362 single-chip computer. Tests the notch filter with a lot of ECG data in the MIT-BIH database, and the results demonstrate the validity and superiority of this algorithm.