linuxaudio.org

On Tue, Jul 03, 2012 at 12:41:58PM -0400, 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. 

* The outputs of first order xover filters will add to exactly the

  input signal. But you only have 6 dB/oct and hat may or may not

  be enough, depending on the application.
* If you want steeper (higher order) filters one solution is to

  us the Linkwitz-Riley type. Outputs add to a perfectly flat

  frequency response, but the phase response of the recombined

  signal is not linear. It won't matter in most cases.
For ready-to-use L-R filters, get zita-lrx1. It provides up to

four bands using 4th order filters (i.e. 24 dB/oct).
Ciao,
--

FA
A world of exhaustive, reliable metadata would be an utopia.

It's also a pipe-dream, founded on self-delusion, nerd hubris

and hysterically inflated market opportunities. (Cory Doctorow)
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