基于简化FFT可跟踪工频干扰的自适应相干模板法的实现  

The Realization of Tracking Power-line Interference Adaptive Coherent Model Base on Part FFT

作　　者：于超[1] 李刚[1] 林凌[1] 

机构地区：[1]天津大学精密仪器学院,天津300072

出　　处：《生物医学工程学杂志》2007年第4期780-784,共5页Journal of Biomedical Engineering

摘　　要：自适应相干模板法以其实现简单、可同时滤除工频干扰和基线漂移等特点,而在智能医疗仪器上得到广泛的应用。但其低频和窄带干扰处的带宽不可独立调节的缺点,限制了其在某些方面,如心电滤波的应用,我们提出了利用简化的FFT跟踪工频干扰频率,微调采样频率的改进方案,使其在满足心电图机低频特性要求的同时获得较好的工频抑制的效果。试验证明在工频波动缓慢的情况下,该算法对工频干扰抑制效果明显。Adaptive coherent model can be easily implemented and it can simultaneously reject the power-line interference and baseline wander. But the relevancy of the filter＇s bandwidth at low-frequency and power-line interference limits its application on ECG filtering. A part fast Fourier transform （FFT） algorithm is presented. It is used to track power-line frequency and adjust the sample frequency. Experiments show that the method still rejects interference efficiently despite of the slow fluctuation of power-line frequency.

关 键 词：自适应模板法 快速傅立叶变换(FFT) 工频干扰 基线漂移 

分 类 号：TH789[机械工程—仪器科学与技术]