基於有限記憶體之高通道 FastICA通道接合技術研究

Abstract

在本論文中，我們針對FastICA在實作過程中，因為記憶體上的限制，所衍生出來的channel switch的問題提出利用FFT-based方法來做channel的接合。相較於基於time domain 相關性的方法，FFT-based 可以有較少的乘法次數，另外論文中使用的方法諸如overlap ratio，select larger impact difference 的方法用來使channel接合的準確率提升，再者，使用downsample 與 half frequency selection來進一步減少運算量，並於論文提出的方法之後使用一個P300的實驗驗證連接情況。

In this thesis, an FFT-based channel stich methodology is proposed to increase the stich quality and reduce the computation time. The FFT computation, overlap ratio scheme, select larger impact difference scheme of the proposed channel stich methodology can increase the stich accuracy. Furthermore, downample scheme and half frequency selection, is used in our data flow since the benefit of less computation cost. The proposed methodology can be verified by a P300 experiment.