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   -> Volume 3, Issue 9


Question: Use of wavelets in noise removal
 
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karlsenr@cc.tacom.army.mil
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PostPosted: Mon Dec 02, 2002 1:08 pm    
Subject: Question: Use of wavelets in noise removal
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Question: Use of wavelets in noise removal


I am currently investigating the use of wavelets in the extraction of
a known signal from other signals plus noise. I have a few questions
regarding this:
1) Does it make sense to try and build a wavelet specific to the known
signal or should one use a standard wavelet and compare the wavelet
transforms of the known signal and the signal under investigation?
In other words, does it help if the wavelet looks like the signal
that one is trying to find?
2) Is there any software available that already does this and/or what
are some good papers that address this application?
3) In note 5.12 on page 166 of Daubechies' 'Ten Lectures on Wavelets'
book, she says that if one knows only the samples f(n) then in order
to perform the subband filtering (pg 156) one should first compute
the coefficients <f,phi0,n>. Is this necessary? I have been applying
the subband filtering directly to the f(n).

Thanks,
Rob Karlsen
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