心电信号滤波器的设计

目的:研究去除心电数据采集系统存在的工频干扰、电极极化干扰、肌电干扰、基线漂移和信号处理中所用电设备产生的仪器噪声等干扰的方法。方法:对工频谐波干扰、肌电干扰和电极极化干扰等高频干扰采用低通滤波;对于基线漂移这种频率成分较低的干扰则采用高通滤波器对其进行滤波,对于工频基频干扰采用50Hz陷波器进行滤波。结果:3种心电信号滤波器的设计方案滤波效果好、速度快、易于实现。结论:它在有嵌入式微处理器和对实时性要求较高的心电监护仪器中具有很高的应用价值,也可应用在其他生物电信号测量的医学仪器及工业测控系统中。

Design of Electrocardiosignal Filter

Objective There are many interferences such as power interference, electrode polarization interference, myoelectricity interference, baseline drift, apparatus buzz and so on in electrocardiosignal acquisition system. It is very difficult to effectively remove these interferences in the process of actual measurement. Methods Power harmonic interference, electrode polarization interference and myoelectricity interference were removed by low-pass filter. Baseline drift was removed by high-pass filter. Power basic frequency interference was removed by 50 Hz trap filter. Results These three design proposals had such advantages as good effect, rapid speed and easy realization. Conclusion They can be well applied in ECG monitor with embedded CPU and real time character. Besides, they can also be used in medical apparatus measuring other biological electric signals and industrial observation and control system.