Multi Mode Bi-Quad Filter

AndydeMaro · 8 Apr 2007

exonerate wrote: just added a set of Biquads to the wiki,

you can get them here.. [old link]

enjoy! 😉

Thanks for the Filter_Schmetic...

echopark · 10 Apr 2007

Thank you for this filters !!!

Tom7777 · 11 Apr 2007

Thanks 😀

second sight · 12 Apr 2007

sweet as! thanks mate!.......... 😊 ..............i love you guys...........

nippybaynes404 · 12 Apr 2007

Thanks alot exonerate 😀 😀 😀 😀

exonerate · 12 Apr 2007

thanks guys 😀

i hope to be adding more stuff to the wiki soon.

cheers 😉

juha_p · 12 Apr 2007

In my RIAA EQ project (Delphi/VST SDK), I prepared those RIAA filters as 3rd-5th order filters. Those wasn't difficult to code but, I had some difficulties w/ getting a rumble (subsonic) filter working. It's just a 36dB/oct Highpass filter (w/ adjustable cut frequency (say 1-50Hz) and Q (say 0.1-1.41)). It was needed to prepare a 4th order filter to get the cut this steep. The filter was hard to get become stable.

Does SM have already a filter component that can be used for this type filter implementation (by coding this is possible, I quess but, could this somehow be done by using those filter components there already exsists in SM)? If there isn't then could it be easy to prepare a filter component that accepts more coefficients than only for 2nd order filter as it's input?

Juha

exonerate · 12 Apr 2007

the filter component in SM only allows up to a 2nd order filter, so if you want a higher order then yes you will have to use the code component, if your just wanting to feed the coeffs in to the code component to get the output then that is very easy. you would just have to create a streamin for each coeff and then process them to get the output.

you would do it something like this.....

but obviously exactly how you would do it would depend on the coeffs you were using, alot of filters have all the coeffs scaled by b0 by dividing b0 with all the other coeffs, so if thats the case you could do that in side the code component, or outside. if you are calculating your coeffs in green maths then that would be better outside.

hope that helps 🙂

minione · 20 Apr 2007

BIG THANX 4 B-Q coeffs!! 😉