<div dir="auto"><div>Hi,<br><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Brian Willoughby wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Second, if you were to build a 4-pole SVF, would it be considered two 2-pole low-pass sections in series, or would the two dual integrators make some folks call it “four” single-pole low-pass sections in series?<br>
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Since I haven’t tried this, I’m not familiar with how global feedback might cause problems with 2 SVF in series. I do recall some nice discussions around here, though.<br></blockquote></div></div><div dir="auto"><br></div><div dir="auto"><span style="font-family:sans-serif">Note that it is perfectly possible to build higher order state variable filters - 3-pole, 4-pole, etc - without cascading 2-pole SVFs.</span><div dir="auto" style="font-family:sans-serif"><br></div><div dir="auto" style="font-family:sans-serif">Neil</div></div></div>