基于整系数滤波器的40Hz认知脑电信号的提取

基于MATLAB软件,设计了整系数带通滤波器来提取40 Hz的EEG信号;由于采集到的脑电信号中可能混杂有头皮、眼动等肌电干扰,对40 Hz的EEG在频率上完全覆盖,所以在提取40 Hz EEG时要考虑肌电干扰的影响,以80 Hz超出一定阈值作为肌电干扰存在的标志,对80 Hz和40 Hz两通道信号采用一致性检测方法,当某两段重合率达到一定程度时剔除40 Hz中对应段,最后留下的视为阵发性40 Hz EEG,从而实现40 Hz EEG的自动检测。

Extracting 40 Hz Cognition EEG Based On Integer Coefficients Filter

Integer coefficients filters,based on MATLAB,are designed to extract the 40Hz EEG.Since the collected EEG may be mixed with Eletromyographical interference that comes from the scalp,eye movement and so on ,the EEG in the frequecy of 40 Hz is completely covered,therefore,EMG interference should be considered when extracting 40 Hz EEG.So in this paper,the 80Hz composition beyond a certain threshold is regarded as the existence of EMG interference.By the method of consistency detection between the two channels of 80Hz and 40 Hz,the part of 40 where their coincidence rate reaches a certain extent will be rejected,leaving the true paroxysmal 40Hz EEG,so that 40Hz EEG auto-detection is achieved.