[sdiy] 3 Pole state-variable filters

[Don Tillman]

   > From: "jhaible" <jhaible at debitel.net>
   > Date: Sun, 10 Feb 2002 23:14:59 +0100
   > 
   > you spend one pair for the BP function, and then decide whether
   > to steepen the upper or the lower slope (i.e. adding a real pole
   > LPF or HPF).  Or is there a way to "distribute" 3 poles equally
   > on both slopes of a BPF function ?

Sure!

      s^2 + s
-----------------
s^3 + s^2 + s + 1


(In practice you'd use more interesting coefficients than 1.0.)

  -- Don

-- 
Don Tillman
Palo Alto, California, USA
don at till.com
http://www.till.com