How thresholding is done after the decomposition of a signal using discrete wavelet transform?

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BIPIN SAMUEL
BIPIN SAMUEL 2022-8-10
回答： Nadia Shaik 2022-11-25
I have a signal which is the combination of two signals, one of which is relevant to me. I have decomposed the signal into diffeternt details and approximation using discrete wavelet transform. In these two of the details have the part of the signal which is relevant. So I need to do hard thresholding on the part which I dont want. How can I do this? Is there any in-build function for the same?

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Nadia Shaik
Nadia Shaik 2022-11-25
Hi Bipin,
I understand that you want to perform thresholding after the decomposition of a signal using Discrete Wavelet Transform.
You can acheive the required workflow by using 'wdenoise' function.
A wavelet and a level N have to be selected and then the wavelet decomposition of the input signal at level N is computed. For each level from 1 to N, select a threshold and then thresholding is applied to the detail coefficients.
I hope this resolves your query.

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