By using MATLAB built-in wavelet function of speech signal processing, first on the loading of the speech signal snow.wav added white Gaussian noise, and then to the speech signal with noise to three layer wavelet decomposition. At last, the mandatory and the default the signal denoising threshold methods are mandatory elimination noise method directly to the decomposition of the high frequency coefficients all goes to zero, the default threshold by the decomposition of the high frequency coefficients threshold to remove noise

一维
....\chazhi.m
....\chouyang.m
....\hpf.m
....\lpf.m
....\main.m

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