ICA快速算法，提高分类效果 滤波 源信号所含的高斯白噪声越多，分离后得到的信号与源信号相比误差越大，效果越差；所含高斯白噪声越少，分离效果越好-Fast ICA algorithm to improve the classification results more contained in the source signal filtering Gaussian white noise, the signal obtained with the source signal separatio