Wavelet transform denoising, the mother wavelet select ' sym4' , the lev default value is 8, is generally 8 wavelet de-noising, par for the CDF coefficient, usually taken 0.9 Signal column vector. Take the noise signal to be reconstructed on decomposition lev layer to the first layer of high-frequency coefficients. View the filtered signal and noise wavelet components

my_de_dwt2.m

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