[sdiy] Different pole notches and phasers
tom at electricdruid.net
Mon Apr 13 12:58:32 CEST 2020
Could someone explain something I don’t understand clearly to me?
What does it mean to talk about the number of poles when discussing a notch filter?
Additionally, what’s the difference between a notch filter and a notch created with an allpass filter and the input added together? Is there a difference?
It seems to me there is, since multiple stages of allpass filters with the input added together (a phaser) creates multiple notches, whereas a multi-pole notch would just be a deeper/narrower notch. Is that right? Or could a 4-pole notch filter have two notches?
There’s something I don’t quite get here, and I’m struggling to find exactly what it is, hence the rather confused questions. Any clarification anyone can offer would be greatly appreciated.
Synth & Stompbox DIY
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