对“Blocks”信号加上高斯白噪声，再用 db3 小波进行分解,以说明三种取阈值方法和三种噪声标志对去噪性能的影响。-right "Blocks" signal with white Gaussian noise, and then db3 wavelet decomposition, to illustrate three thresholding methods and three noise signs of de-noising performance.