SynthMaker

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Archive · 2008 5 old posts

From the original SynthMaker forum (2004–2014), with its members’ names and dates.

chironex ·

Hey. I'm working on a plug where you can choose the coordinates of the zeros and poles on a filter's pole-zero diagram, and then it'll filter the sound likewise. I just want to make sure I'm doing everything correctly, 'cause some of the amp responses seem incorrect.

OSM

MyCo ·

I just had the same idea

chironex ·

Cool, but...that still doesn't answer my question 😉

MyCo ·

just compare it yourself, see attachment

I don't know where you got your calculations from... I used the shortcut for biquads from here: http://www.dspguide.com/CH33.PDF

But I changed it with cos(w)=x/r...

chironex ·

Ewww, I have lots of work to do. But, I still don't really know what's wrong. Here's where my calculations come from:

PDF

Is there anyone out there with experience with these sort of filters?

EDIT: You treated my filter incorrectly, it should have 4 components...but, it still works incorrectly X)

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