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Optimizing Filter Module

DSP related issues, mathematics, processing and techniques

Optimizing Filter Module

Postby Wishx » Tue Feb 18, 2014 11:31 am

Hi community!

I have found this quite light and easy to use filter ( attached) yet from analyzing the LPF and HPF I see a slight resonance in the response (with Q = 0 ): Image not sure which part of the code is responsible for it ... Can someone help in making it flat ? :?

Also is there a way, since this is a 8/db per octave filter , to have a numberbox where we can insert how many db/octave we want ? :geek:

(I think that'd be pretty cool and make it so much more flexible :evil: )
Attachments
FIlters.fsm
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Re: Optimizing Filter Module

Postby tester » Tue Feb 18, 2014 7:09 pm

For flat response search for butterworth filters (here and SM forum).
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Re: Optimizing Filter Module

Postby Wishx » Thu Feb 20, 2014 12:05 am

I was peeking for some similar filters and how to change the db/octave thing , yet I couldnt find a specific LPF and HPF along with a db/octave option wich Is the main module I need :| , I hope this is something you or someone can help me with ! thanks :)
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Re: Optimizing Filter Module

Postby MegaHurtz » Thu Feb 20, 2014 3:39 am

This looks very much like a Butterworth, Im on the older synthmaker so cant check.
But, the response has a little bump because its a 2nd order filter, so you have to delete the suspected "highpass" section and youre good to go. Seeing this.. I would actually prefer this one over whatever you make of it but thats a matter of taste I guess. Also you can see if the resonance parameter has a setting other than 0, and set it to negative or zero.
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