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gabbagabi
Joined: Nov 29, 2008
Posts: 652
Location: Berlin by n8
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ixtern
Joined: Jun 25, 2018
Posts: 145
Location: Poland
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 Posted: Sun Jan 20, 2019 1:17 pm Post subject:
Re: parametric EQ
Subject description: from a SVF a Atenuverter and a mixer? |
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| g.gabba wrote: | hi guys,
could you give me a hand?
is my thinking right or wrong?
can we use our building blocks/modules to form a parametric eq?
cu
gabigabba |
I think that parametric equalizer is simply set of bandpass filters plus one low- and one high-pass filter with a full control (means frequency, gain and bandwidth or Q). So yes, it could be build with a set of VCFs, if you really have such a whim. |
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Grumble
Joined: Nov 23, 2015
Posts: 1294
Location: Netherlands
Audio files: 30
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| Posted: Sun Jan 20, 2019 2:17 pm Post subject:
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vcf are usualy low pass filters...
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JovianPyx
Joined: Nov 20, 2007
Posts: 1988
Location: West Red Spot, Jupiter
Audio files: 224
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| Posted: Sun Jan 20, 2019 3:29 pm Post subject:
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mmm... a state variable VCF can easily be made multimode, and there's a lot of modulars that have state variable filters because they are easy to build.
Anyway, for this application the state variable filter is probably ideal since you can get low pass, band pass and high pass.
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blue hell
Site Admin
Joined: Apr 03, 2004
Posts: 24084
Location: The Netherlands, Enschede
Audio files: 278
G2 patch files: 320
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Posted: Sun Jan 20, 2019 4:02 pm Post subject:
Re: parametric EQ
Subject description: from a SVF a Atenuverter and a mixer? |
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| g.gabba wrote: | | can we use our building blocks/modules to form a parametric eq? |
Yes, and you can do other stuff with it too.
When N is like 3 you can approximate voice formants (eaoiu), and when its a bit larger you can use it to do basic physical modeling. With N=11 I have a very nice bell sound.
The trick is then in finding the right parameters .. to do that manually is a bit tedious ... but still .. you can find tables on the webs.
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Jan
also .. could someone please turn down the thermostat a bit.
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L´Andratté
Joined: Sep 23, 2012
Posts: 150
Location: Hamburg, Germany
Audio files: 5
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Posted: Mon Apr 01, 2019 3:25 pm Post subject:
Re: parametric EQ
Subject description: from a SVF a Atenuverter and a mixer? |
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| Blue Hell wrote: | | g.gabba wrote: | | can we use our building blocks/modules to form a parametric eq? |
Yes, and you can do other stuff with it too.
When N is like 3 you can approximate voice formants (eaoiu), and when its a bit larger you can use it to do basic physical modeling. With N=11 I have a very nice bell sound.
The trick is then in finding the right parameters .. to do that manually is a bit tedious ... but still .. you can find tables on the webs. |
Very interesting to stumble about this Blue Hell, can you give more clues?
"N" = feedback ratio?
Is it pinged or oscillating?
I have just come across this very similar approach
https://aether-machine.com/mutant-theory/
Was always fascinated by "analog" physical modeling, whatever that is--- 
And this seems to invite experimentation!
| Quote: | | The Mode switch changes the physical modelling behaviour between the wave equation and fluid flow, the latter tends to be more unstable. |
What might that mean(from above link)? |
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Grumble
Joined: Nov 23, 2015
Posts: 1294
Location: Netherlands
Audio files: 30
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blue hell
Site Admin
Joined: Apr 03, 2004
Posts: 24084
Location: The Netherlands, Enschede
Audio files: 278
G2 patch files: 320
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| Posted: Tue Apr 02, 2019 10:06 am Post subject:
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The N = 3 refers to the number of parallel filters .. you can excite them with a saw or pulse shaped wave .. but add some noise for whispering .. self oscillation I never tested ... altough I had some idea to make a formant osciallator maybe ... being a set of oscillators tuned to formant frequencies.
The example software posted above has N=4.
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Jan
also .. could someone please turn down the thermostat a bit.
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