<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi all,<div class=""><br class=""></div><div class="">Could someone explain something I don’t understand clearly to me?</div><div class=""><br class=""></div><div class="">What does it mean to talk about the number of poles when discussing a notch filter?</div><div class=""><br class=""></div><div class="">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?</div><div class=""><br class=""></div><div class="">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?</div><div class=""><br class=""></div><div class="">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.</div><div class=""><br class=""></div><div class="">Thanks,</div><div class="">Tom</div><div class=""> </div><div class=""><div class="">
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