对信号进行快速FFT变换,绘制原始信号序列. 小波去噪,将信号用小波函数SYM5分解到第5层，用minimaxi阈值选择对系数进行处理，消除噪声.-The signal fast FFT transform, to draw the original signal sequence denoising the signal decomposition wavelet function SYM5 to the 5th floor, the choice of coefficients trea