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Linkwitz-Riley bandpass filter design

Started by carleeto February 18, 2008
Thank you. I would like to be able to boost and cut. Would the Audio EQ
Cookbook (http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt) be of any
help in this case? I guess I would be looking for a shelving EQ. Is there
a better candidate I could use? At present, I'm not thinking about
splitting the sound stream, just processing it.

However, if I do split it, could I use two LR crossovers to split the
input stream, then sum their outputs and apply boosts/cuts to effectively
synthesize a 3 band EQ?
>Thank you. I would like to be able to boost and cut. Would the Audio EQ >Cookbook (http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt) be of any >help in this case? I guess I would be looking for a shelving EQ. Is
there
>a better candidate I could use? At present, I'm not thinking about >splitting the sound stream, just processing it. > >However, if I do split it, could I use two LR crossovers to split the >input stream, then sum their outputs and apply boosts/cuts to
effectively
>synthesize a 3 band EQ? >
I do realize there might be a few things wrong with my understanding. Please do let me know what they are so I could learn. Thank you so much for all your responses. They have really helped a lot.
On Tue, 19 Feb 2008 16:15:09 -0600, "carleeto" <carleeto@gmail.com> wrote:

>However, if I do split it, could I use two LR crossovers to split the >input stream, then sum their outputs and apply boosts/cuts to effectively >synthesize a 3 band EQ?
Only if you also include the allpass compensation detailed in the D'Appolito paper that I referenced in an earlier reply. Greg
>On Tue, 19 Feb 2008 16:15:09 -0600, "carleeto" <carleeto@gmail.com>
wrote:
> >>However, if I do split it, could I use two LR crossovers to split the >>input stream, then sum their outputs and apply boosts/cuts to
effectively
>>synthesize a 3 band EQ? > >Only if you also include the allpass compensation detailed in the >D'Appolito paper that I referenced in an earlier reply. > >Greg >
Thanks Greg. Will have a look at it.
>On Mon, 18 Feb 2008 16:35:31 -0600, Vladimir Vassilevsky
<antispam_bogus@hotmail.com> wrote:
> >>> You know, Vlad, you are the only one who picked up on carleeto's >>> fundamental misconception. The rest of read "Linkwitz-Riley" and just
>>> assumed he _meant_ crossover. Good catch! > >I have actually designed multiband dynamics processors using crossover
topologies. Extension of the concept to EQ was not
>difficult. I figured the OP wanted something akin to the
Bass/Presence/Treble controls on old-time preamplifiers. That is exactly what I was looking for. In fact, that is also what I was designing - a simple set of Bass/Presence/Treble controls for use during playback in the auditorium. I found a lot of useful info here : http://www.planetanalog.com/article/printableArticle.jhtml?articleID=12802683 I was able to use a Linkwitz-Riley crossover topology to achieve this. I believe the result would be a shelving EQ. Thank you for all your help.