Why Wavelet 1-D Denoising in Matlab can only happen on approximation coefficients?
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I have been trying to get familiar with Wavelet toolbox in matlab for denoising purposes. I understand that wavelets assumes noise does not affect much low frequency bands which is why thresholding to denoise can only happen on details.
I also understand that details are for HPF and approximation are for the LPF part of the decomposition.
How can I apply thresholding on the approximation coefficients?
Also since my input to the Wavelet 1-D is discrete data without sampling frequency information how are the filter banks frequencies dictated when forming the decomposition?
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