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   -> Volume 6, Issue 1


Question: Wavelet sampling
 
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Julie Wilson (julie@yorvic.york.ac.uk)
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PostPosted: Thu Jan 09, 1997 11:48 pm    
Subject: Question: Wavelet sampling
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#24 Question: Wavelet sampling

I am a beginner to wavelets and would like to ask a basic question
about discrete orthogonal wavelets. As far as I can see the theory
(according to people like Mallat and Daubechies) seems to apply to
the coefficients <f,phi> where f is the signal and
phi is the scaling function and rather than the signal
itself. However, other papers and, in particular, the book
"Numerical recipes in Fortran" which gives code to do a wavelet transform
using Daubechies wavelets, seem to use the signal, f, rather than <f,phi>.
I have tried to work out what you are doing if you do this, thinking of
f as f(n) = sum_k <f,phi_k> phi(n-k) but it just doesn't seem to give
anything sensible. Does anyone understand this question and if so can
they be bothered to answer it?

confused of York, a.k.a julie@yorvic.york.ac.uk

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