[sdiy] Basic 4th order LP butterworth filter papers

[Aaron Lanterman]

On Feb 5, 2010, at 1:45 AM, Paul Maddox wrote:

>> Like this, or something else?
>> http://focus.ti.com/lit/ds/symlink/tlc14.pdf
> 
> How do these sound in a synth?
> has anyone ever tried them?

I wouldn't expect one to be particularly exciting. The defining aspect of a Butterworth is that it has the steepest cutoff you can get for a given order without any ripple. 

A two-pole lowpass filter is a Butterworth if you use a Q of 1/sqrt(2) (if I recall correctly). 

- Aaron