Re: [LAU] [Sort of OT] Ringing in filters

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From: Fons Adriaensen <fons@...>

To: <linux-audio-user@...>

Subject: Re: [LAU] [Sort of OT] Ringing in filters

Date: Wednesday, May 12, 2010 - 8:52 am

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

> Fons Adriaensen wrote:

quoted text

>
> > 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

O tu, che porte, correndo si ?
E guerra e morte !
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Messages in current thread:

[LAU] [Sort of OT] Ringing in filters, Mark Knecht, (Tue May 11, 9:43 pm)

Re: [LAU] [Sort of OT] Ringing in filters, Fons Adriaensen, (Tue May 11, 10:11 pm)

Re: [LAU] [Sort of OT] Ringing in filters, Mark Knecht, (Tue May 11, 10:36 pm)

Re: [LAU] [Sort of OT] Ringing in filters, Erik de Castro Lopo, (Tue May 11, 11:35 pm)

Re: [LAU] [Sort of OT] Ringing in filters, Fons Adriaensen, (Tue May 11, 11:19 pm)

Re: [LAU] [Sort of OT] Ringing in filters, Mark Knecht, (Wed May 12, 1:16 am)

Re: [LAU] [Sort of OT] Ringing in filters, Erik de Castro Lopo, (Wed May 12, 4:55 am)

Re: [LAU] [Sort of OT] Ringing in filters, Ken Restivo, (Wed May 12, 12:41 am)

Re: [LAU] [Sort of OT] Ringing in filters, Fons Adriaensen, (Wed May 12, 9:11 am)

Re: [LAU] [Sort of OT] Ringing in filters, Ken Restivo, (Wed May 12, 6:32 pm)

Re: [LAU] [Sort of OT] Ringing in filters, Fons Adriaensen, (Wed May 12, 7:44 pm)

Re: [LAU] [Sort of OT] Ringing in filters, Ken Restivo, (Thu May 13, 9:01 am)

Re: [LAU] [Sort of OT] Ringing in filters, Ken Restivo, (Thu May 13, 8:44 am)

Re: [LAU] [Sort of OT] Ringing in filters, Joel Roth, (Wed May 12, 8:16 pm)

Re: [LAU] [Sort of OT] Ringing in filters, Ken Restivo, (Thu May 13, 8:00 am)

Re: [LAU] [Sort of OT] Ringing in filters, Joel Roth, (Mon May 17, 9:14 am)

Re: [LAU] [Sort of OT] Ringing in filters, Ken Restivo, (Mon May 17, 9:31 am)

Re: [LAU] [Sort of OT] Ringing in filters, Fons Adriaensen, (Tue May 18, 8:55 pm)

Re: [LAU] [Sort of OT] Ringing in filters, Folderol, (Tue May 18, 9:03 pm)

Re: [LAU] [Sort of OT] Ringing in filters, Patrick Shirkey, (Mon May 17, 9:52 am)

Re: [LAU] [Sort of OT] Ringing in filters, Ken Restivo, (Wed May 12, 8:04 pm)

Re: [LAU] [Sort of OT] Ringing in filters, Jörn Nettingsmeier, (Mon May 17, 9:55 am)

Re: [LAU] [Sort of OT] Ringing in filters, Garry Ogle, (Mon May 17, 8:13 am)

Re: [LAU] [Sort of OT] Ringing in filters, Erik de Castro Lopo, (Tue May 11, 11:46 pm)

Re: [LAU] [Sort of OT] Ringing in filters, Fons Adriaensen, (Wed May 12, 8:52 am)

Re: [LAU] [Sort of OT] Ringing in filters, Mark Knecht, (Wed May 12, 1:00 am)

Re: [LAU] [Sort of OT] Ringing in filters, Chris Cannam, (Wed May 12, 9:09 am)

Re: [LAU] [Sort of OT] Ringing in filters, Chris Cannam, (Thu May 13, 7:47 am)

Re: [LAU] [Sort of OT] Ringing in filters, Mark Knecht, (Wed May 12, 3:05 pm)