Re: [linux-audio-dev] analysis/resynthesis environment?

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Subject: Re: [linux-audio-dev] analysis/resynthesis environment?
From: Erik de Castro Lopo (erikd-lad_AT_mega-nerd.com)
Date: Tue Aug 06 2002 - 02:59:38 EEST

On Tue, 6 Aug 2002 01:51:38 +0200
Vincent Touquet <vincent.touquet_AT_pandora.be> wrote:

> On Mon, Aug 05, 2002 at 02:35:33PM -0700, Andrew W. Schmeder wrote:
> >Loris (open source): http://www.cerlsoundgroup.org/Loris/
> > --andy
>
> Has anyone tried Wavelets /

Yes.

> Wavelet Packets for
> better time / frequency accuracy ?

No :-).

The Dyadic Wavelet Transform (maximally decimated) is not very useful
in this area as it splits the signal into ocatves. It can be divided
down further but the relationship between to transform domain data
and anything in the time domain signal becomes more and more tenuous.

A discrete version of the Continuous Wavelet Transform may be more
useful but has a heavy computation cost in comparison to the FFT
and DWT.

The Wavelet Transform has been around for nearly two decades now
and I have yet to see any application other than compression where
the results can even challenge results obtained with the FFT.

Please do correct me if I am wrong.

Erik 

-- 
+-----------------------------------------------------------+
  Erik de Castro Lopo  nospam_AT_mega-nerd.com (Yes it's valid)
+-----------------------------------------------------------+
Moore's Law: hardware speed doubles every 18 months
Gates' Law: software speed halves every 18 months

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