I did some work with wavelets last year.  I also found Ian Kaplan's work, 
http://www.bearcave.com/misl/misl_tech/wavelets/index.html, pretty useful.

My results using wavelets for audio processing was mixed.  I had extremely good 
results with spectral morphing, but trying to do time-stretching or 
frequency-shifting introduced a lot of noise.  I've heard that using a Dual-Tree 
Complex Wavelet Transform will mitigate most of those artifacts; Jeff Livingston 
wrote a report, http://users.ece.utexas.edu/~bevans/students/ms/jeff_livingston/, 
about this approach.  Most of my work was based on using partial sections of a 
wavelet packet transform to achieve greater frequency resolution than provided by the 
DWT.  I haven't had a chance yet to combine it with Jeff's work, but I expect it 
would yield good results.

If anyone else has done work using wavelets or chirplets for audio transformation, 
could you please contact me?
Thanks,
John

John W. Lato
School of Music
The University of Texas at Austin
1 University Station E3100
Austin, TX 78712-0435
(512) 232-2090

Chuckk Hubbard wrote:
> I went searching for some DSP ebooks and found some interesting ones:
> 
> The Scientist's and Engineer's Guide to DSP:
> http://www.analog.com/processors/learning/training/dsp_book_index.html 
> 
> 
> Algorithms for Programmers:
> http://www.jjj.de/fxt/fxtbook.pdf
> 
> A Really Friendly Guide to Wavelets:
> http://perso.wanadoo.fr/polyvalens/clemens/download/arfgtw_26022004.pdf
> 
> May not be much to some, but I expect to spend many hours with these.  
> I'm jealous of the understanding some of you have of this stuff; any 
> advice on free and cheap resources is welcome.
> 
> -Chuckk
> 
> -- 
> http://www.badmuthahubbard.com