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 Forum index » Clavia Nord Modular » NM Classic (NM1 or G1)
How tomake a shallow filter
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Tusker



Joined: Feb 03, 2005
Posts: 110
Location: Texas

PostPosted: Wed Feb 16, 2005 1:41 pm    Post subject: How tomake a shallow filter Reply with quote  Mark this post and the followings unread

I'd like to construct a fairly shallow low pass filter (1-3 db/octave). Can you offer me any advice on how to do so?

I thought of running the unfiltered sound in parallel to a 12b LPF, but that creates a slope of zero. I thought of mixing 12 db LPF signal with a high pass filtered (6db) signal at 150% gain but I'm not sure if that kind of math works in the signal processing realm.

I could use the filter bank or stacked EQ's I assume. That raises the question of how I can calibrate the slope, assuming I figure out the architecture. I do have a frequency distribution graph, and I could eyeball it to get close but if there is a more robust method, it would be preferable. Has anyone set out to do this?

Thanks in advance,

Jerry
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Blue Hell
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Joined: Apr 03, 2004
Posts: 20274
Location: The Netherlands, Enschede
Audio files: 143
G2 patch files: 318

PostPosted: Wed Feb 16, 2005 1:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

Rob Hordijk has quite some interesting things to say about filters at http://www.xs4all.nl/~rhordijk/G2Pages/index.htm .

I know this is for the G2, but you might get some ideas from it - especially from the "very nice and overeasy tone control".

Jan.
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