Req: Graphical filter display

stefan · 20 Oct 2006

jobro wrote: I'm trying to make a filter display showing the shape of a filter, but I allways fall short, I've been able to plot a line but that's just about what I can do.

Create another synced module of your filter, hook it up to an analyser and feed an impulse to it's input. Hook up the same cutoff and resonance knobs etc as to the filter processing the actual stream.

FFT and normalize the output of the analyser. Then feed that to a graph displayer.

If you need an example schematic I can knock something together when I get the time to!

Tom7777 · 21 Oct 2006

I know this is jobro's question so i hope he won't mind me joining in. Just wanted to say this is something i was thinking about doing but never got around to it, a example would be a great help 🙂

stefan · 23 Oct 2006

Here's a simple example:

Schematic: filter_response.osm

The same filter module is used twice, once for the analyser and once for the actual sound processing, they both are being fed with the same settings but the one for the analyser is fed with an impulse response, so that we can analyse the frequency response of said module.

Tom7777 · 23 Oct 2006

Nice, thanks stefan 😀

jobro · 24 Oct 2006

Sweet! Didn't realize that I could use an analyzer to display filters, thought I had to write one myself. So big thanks!