Descr iption: This M-file plots the truncated Fourier Series representation of a square wave as well as its amplitude and phase spectrum.- Descr iption: This M-file plots the truncated Fourier Series representation of a squa

方波信号削噪，用sym8小波进行三层分解并用heursure软阈值进行小波系数阈值化-Cut a square wave signal noise, three with sym8 wavelet decomposition and use heursure soft threshold wavelet coefficients thresholding