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3dB per ocatve filter -- please
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bachus



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PostPosted: Wed Feb 27, 2008 6:42 pm    Post subject: 3dB per ocatve filter -- please Reply with quote  Mark this post and the followings unread

Does anyone have a schematic and or design formulas for an analog 3dB per octave low pass filter? (Sometimes called a pink noise filter.)
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Blue Hell
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PostPosted: Thu Feb 28, 2008 5:45 am    Post subject: Reply with quote  Mark this post and the followings unread

http://electro-music.com/forum/post-35398.html has a Nord Modular G2 implementation and some words accompanying it, maybe it's of some use.

A screen shot :


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DrJustice



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PostPosted: Thu Feb 28, 2008 6:24 am    Post subject: Reply with quote  Mark this post and the followings unread

This website has a few interesting circuits, including a couple of 3dB/oct filters.

Edit: fixed URL.

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Last edited by DrJustice on Thu Feb 28, 2008 10:07 am; edited 1 time in total
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Pehr



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PostPosted: Thu Feb 28, 2008 8:05 am    Post subject: Reply with quote  Mark this post and the followings unread

How about a RC-filter?

Posted Image, might have been reduced in size. Click Image to view fullscreen.

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bachus



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PostPosted: Thu Feb 28, 2008 8:55 am    Post subject: Reply with quote  Mark this post and the followings unread

Pehr wrote:
How about a RC-filter?

Posted Image, might have been reduced in size. Click Image to view fullscreen.


Thanks but I think that's 3dB power per octave (voltage drop 6dB per octave?) what I need is 3dB voltage per octave.

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bachus



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PostPosted: Thu Feb 28, 2008 9:05 am    Post subject: Reply with quote  Mark this post and the followings unread

DrJustice wrote:
This website has a few interesting circuits, including a couple of 3dB/oct filters.

DJ
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Thanks, I think this from there is what I'll have to use.

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PostPosted: Thu Feb 28, 2008 9:10 am    Post subject: Reply with quote  Mark this post and the followings unread

bachus wrote:
Thanks but I think that's 3dB power per octave (voltage drop 6dB per octave?) what I need is 3dB voltage per octave.


Oh, yes you're right doh Smile

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Kassen
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PostPosted: Thu Feb 28, 2008 11:21 am    Post subject: Reply with quote  Mark this post and the followings unread

Blue Hell wrote:

A screen shot :


Curses! I haven't had enough coffee yet to sort that into coefficients for two or three digital filters.

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bachus



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PostPosted: Thu Feb 28, 2008 12:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

Kassen wrote:
Blue Hell wrote:

A screen shot :


Curses! I haven't had enough coffee yet to sort that into coefficients for two or three digital filters.


Thanks, I think I'll go the analog route for this one, but don't let that keep you from your coffee Wink

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