[sdiy] more-pole filter

[Ian Smith]

> It has to do with how the feedback resonance path works.
> 
> Each pole gives a 45 degree phase shift at the cutoff frequency. So if  
> you have four poles, that gives you 180 degrees of phase shift. If you  
> then take the signal and feed it back (with a minus sign), you  
> accentuate the frequencies around the cutoff. This gives you a nice,  
> predictable way to place that peak.
> 
> See the videos for Sessions 15, 16, 17, and 18 here:
> 
> http://users.ece.gatech.edu/~lanterma/ems

*pouts* why can't NIU have a class like that? I'm going to have to twist some arms. Anyway, I totally want to take your class and once I get some money I'm definately going to donate because, well, damn those kids are lucky and I want to make sure it stays around for a while.

 
> Warning: I wasn't very coherent during that series of lectures (which  
> it why it took me four sessions, I had to go back and clean up some  
> stuff I said that wasn't quite right or wasn't clear.)

You were actually a lot more coherent that a lot of my teachers are. I found the videos very helpful.

Thanks,
-Ian
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