[LAU] [Sort of OT] Ringing in filters

[Fons Adriaensen]

On Wed, May 12, 2010 at 09:46:03AM +1000, Erik de Castro Lopo wrote:

> Fons Adriaensen wrote:
> 
> > 2. the sum of the filter outputs equals the original input.
> > 
> > This is a *hard* problem. Basically none of the classical filter
> > types have these properties. There are filter sets that can do
> > this but they are quite esoteric.
> 
> Linkwitz-Riley filters:
> 
>     http://en.wikipedia.org/wiki/Linkwitz-Riley_filter
> 
> I'm pretty sure they can just be converted to the digital domain
> using the bilinear transform.

L-R filters do *not* sum to the original signal. The amplitude
response of the sum is flat, but the phase response is not linear.

Ciao,

-- 
FA

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E guerra e morte !