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   -> Volume 6, Issue 2

Question: Wavelets and DSP
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"Steven Schulze" (

PostPosted: Sun Feb 09, 1997 3:49 am    
Subject: Question: Wavelets and DSP
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#29 Question: Wavelets and DSP


I'm currently experimenting with applying DSP functions to sampled
audio waveforms. I'm currently using the FFT, but ran into problems
concerning it's limitations.

For instance, the low frequancy resolution is very poor, and the large
sidelobes when transforming waveforms with frequancies that don't fall
on the transform harmonics also cause problems.

Note that my objective is to transform the discrete time signal,
perform some processing to it, and CONVERT IT BACK to time domain.
Obviously, hi-fedility is important.

Some of the processing I currently do using the FFT:

1) Selective frequancy filtering.
2) Noise removal
3) Frequancy shifting (constant time)
4) Time compression/expansion (constant frequancy)
5) Selective frequancy phase shifting
6) etc.

I know nothing about wavelets at this point, so my question is the
following... Is it worth investing the time into learning about
wavelets, and can it do the same type of DSP on audio as described
above, with maybe better results? Is this a slower transform than the

Note: This is not for speach, but for much more critical music
applications. ANY noticable artifacts will make the resultant data
unusable. I'm not looking for sample-by-sample reconstruction, but
just very good results.

Any help would be greatly appreciated!


Steven Schulze
Concord, CA
All times are GMT + 1 Hour
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