摘要
针对μV级脑电信号高频干扰和50 Hz工频干扰及对线性相位性的要求,应用频率采样技术设计了0～40 Hz FIR低通滤波器;并克服了传统FIR 50 Hz陷波器滤波阶数要求过高和对频率不稳定干扰信号缺乏鲁棒性的弊端,设计出50 Hz自适应陷波器。Matlab仿真后的波形图和功率谱图表明,该技术能很好地抑制高频干扰和50 Hz工频干扰信号。将经过仿真后的算法通过编程在DSP芯片上进行了实现。
For high-frequency interference and 50 Hz interference of UV level EEG, this article designs 0 - 40 Hz FIR low-pass filter by the technology of frequency sampling in accordance with the requirements of linear phase, and overcomes the traditional FIR 50 Hz noteh filter lack of robustness for the interference signal of instability frequency,and designs 50 Hz adaptive notch filter. The waves and power spectra after Matlab simulation show the good inhibition for the high-frequency interference and the 50 Hz interference signal . Finally, algorithm through simulation programmed in the DSP chip.
出处
《微型机与应用》
2010年第4期58-61,64,共5页
Microcomputer & Its Applications
