multiband compressor

I think this books has some good info on compressors (at least single-band):
Digital Audio Signal Processing
by Udo Z�lzer (Author)

For multiband compressors, once you have a single-band version working, my
understanding is that you just split up your input signal into a number of
bands, run the single-channel compressor on each band, then re-combine at
the end.  Obviously, care must be taken in the splitting and re-combining to
avoid distortions.  Theory from designing cross-over filters might be useful
here.

In my opinion, it is not extremely difficult to implment a basic multiband
compressor.  But doing it so it sounds "good" may take a fair amount of
skill and tweaking time.  It's one of those "the devil is in the details"
things.

"Eric" <ralawa@yahoo.fr> wrote in message
news:pan.2003.08.03.17.51.25.151778@yahoo.fr...
> Hi,
>
> I would like to write a digital audio effect processor with the ADI
ADSP-21161N
> DSP. I have some troubles to find some references which talk about
> compressors and especially about multiband compressors. Can you suggest me
> some urls or books which talk about this subject?
>
> I have found during my web surfing that designing a multiband compressor
> is very very difficult. Some peoples says that some companies have taken a
> lot of years to develop their audio compressors. It seems for me very
> exaggerated. What is your opinion?
>
> Thank you.
>
> --
> Eric