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

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Gokul 2013-3-20

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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