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 Forum index » Clavia Nord Modular » Nord Modular G2 Discussion
What does the 'deep' comb filter do?
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Chet



Joined: Nov 19, 2004
Posts: 231
Location: Lititz,PA,USA
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G2 patch files: 35

PostPosted: Mon Jun 11, 2007 9:46 am    Post subject: What does the 'deep' comb filter do? Reply with quote  Mark this post and the followings unread

Hey, does anyone know what the 'deep' setting on a G2 comb filter actually does?

I've got the Computer Music Tutorial, which explains how to make peak and notch comb filters, but I'd like to understand how Clavia combines them together somehow to make the 'deep' filter.

Just curious, that's all.
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sheridan



Joined: Jun 05, 2005
Posts: 473
Location: London, England
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PostPosted: Tue Jun 12, 2007 5:21 am    Post subject: Reply with quote  Mark this post and the followings unread

Hey Chet, how's it going old chum? I'm just guessing here, but I'm thinking it has some extra feedback or resonance circuit... more likely feedback than resonance. Then again, that's just a wild guess and you were probably after some more concrete answers. Confused
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Chet



Joined: Nov 19, 2004
Posts: 231
Location: Lititz,PA,USA
Audio files: 7
G2 patch files: 35

PostPosted: Tue Jun 12, 2007 7:29 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi and thanks, things are going well. I just returned from a vacation at the beach, so I'm feeling good. But it made me miss the electro-music festival for the second time in a row. Aarrgh!

I'm thinking that the 'deep' setting includes a combination of feedback and feed-forward signal paths, with some negation somewhere. But that describes an allpass filter. So I can't figure it out.
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Chet



Joined: Nov 19, 2004
Posts: 231
Location: Lititz,PA,USA
Audio files: 7
G2 patch files: 35

PostPosted: Wed Jun 13, 2007 4:45 am    Post subject: Reply with quote  Mark this post and the followings unread

After some experimentation, it turned out to be simpler than I thought.

The 'notch' setting is a delay line whose output is mixed with the original signal.

The 'peak' setting is a delay where the output is looped back and mixed with the input.

The 'deep' setting is simply a circuit that includes both signal paths, with the gain of each linked together.
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Blue Hell
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Joined: Apr 03, 2004
Posts: 20623
Location: The Netherlands, Enschede
Audio files: 150
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PostPosted: Wed Jun 13, 2007 2:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

Chet wrote:
The 'deep' setting is simply a circuit that includes both signal paths, with the gain of each linked together.


when one goes more active the other goes less ?

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Chet



Joined: Nov 19, 2004
Posts: 231
Location: Lititz,PA,USA
Audio files: 7
G2 patch files: 35

PostPosted: Thu Jun 14, 2007 4:22 am    Post subject: Reply with quote  Mark this post and the followings unread

No, actually, they're ganged together. It was simpler than I thought it would be.

Attached is a patch that simulates (I think) the three comb filter types.


CombFilter.pch2
 Description:
Delay circuit that simulates the G2 comb filter types.

Download
 Filename:  CombFilter.pch2
 Filesize:  1.46 KB
 Downloaded:  735 Time(s)

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Blue Hell
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Joined: Apr 03, 2004
Posts: 20623
Location: The Netherlands, Enschede
Audio files: 150
G2 patch files: 318

PostPosted: Tue Jun 19, 2007 12:56 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Chet,

yoyr patch gives some wonderful results using long (modulated)delay times !

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