Optimal Frequency Band Selection Based on Filter Banks and Wavelet Packet Decomposition in Multi-class Brain–Computer Interfaces

  • Qingguo Wei
  • Bin Wan
  • Zongwu Lu
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 238)


To address the problem of low system recognition rate in multi-class brain–computer interface (BCI), many ideas have been proposed. Among them frequency optimization is a good option because the performance of BCI systems depends largely on the operational frequency band of electroencephalography (EEG) signals. In this chapter, feature selection method was utilized to select frequency bands for classification in multi-class BCI systems. The procedures of the proposed algorithm are as follows: Firstly, all single-trial EEG signals are divided into some subband signals by two different methods. One is wavelet packet decomposition and the other is filter bank based on coefficient decimation. Secondly, a multi-class common spatial pattern algorithm based on approximate joint diagonalization is used to extract features of EEG signals on each subband. Finally, optimal subband features are selected for classification. In offline analysis, the proposed method yielded relatively better cross-validated classification accuracies.


Filter Bank Motor Imagery Wavelet Packet Feature Selection Method Common Spatial Pattern 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



This study was funded by National Natural Science Foundation of China (# 60965004).


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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Department of Electronic EngineeringNanchang UniversityNanchangChina

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