linuxaudio.org

On Tue, Jul 3, 2012 at 11:41 AM, S. Massy  wrote:

quoted text
> Hello, all,

> Here's a question for the fine DSP and accoustic experts on this list. I

> need to apply different processing (mostly reverb and compression) to

> different bandwidths of the frequency spectrum on a given track. How

> would I go about using filters to implement crossovers as flat as

> possible? Most plugins do not actually seem to tell what their rolloff

> curve is.

> Thanks.

> Cheers,

> s.M.

Your choices are limited by the bandwidth and center frequencies you choose.
When you choose the quality factor to get a certain phase/magnitude

characteristic, that determines your bandwidth:cutoff freq ratio for

resonant filters.
I would defer to more experienced members on the list--but I think

your best choice is to use 2nd order low-pass/high-pass pairs with

Q=0.5.  That will get you a reasonable (but not perfect)

reconstruction and nice flat response.
To get perfect reconstruction--with the limitation of 1-octave band

filters--you can use wavelets and their associated mirror quadrature

filters.
Chuck

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