How do we select the values of Sigma and Alpha in wavelet ?

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Gokul
Gokul am 20 Mär. 2013
How do we select the values of Sigma and Alpha in wavelet ?
I have considered a audio signal and added some white guassian noise to it.
1)In X = wpcoef(T,N);what is the significance of N and how do we select its value ?
2)How do we select the values of Sigma and Alpha in the command " THR = wpbmpen(T,SIGMA,ALPHA) "

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