摘要：

The pretreatment of collected EEG signals is quite important in processing EEG signals.By adopting the knowledge of signal analysis and processing,we simulate the impact of different wavelet basis functions on the decomposition and reconstruction of EEG signals based on matlab platform.Then we decompose and reconstruct EEG in a 5layer multiscale way by using db5 wavelet basis function,and simulate the vibration of the signals.By comparing the simulation results of denoising under different thresholds with that under lowpass filters,we analyze and study the results of specific frequency bands.The research shows that in the process of denoising EEG signals,wavelet analysis can extract EEG micro signals effectively,and thus has important value on the practical use of EEG in broader fields.

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