PlanetZ forums - scopeusers.com

Posted: **Mon Aug 16, 2004 6:57 am**

Just wondering what it means, a '4-pole filter' or '2-pole filter'? (The 'pole' bit).

Royston

Posted: **Mon Aug 16, 2004 8:59 am**

"Tent poles", so it is!

http://www.soundonsound.com/sos/sep99/a ... ecrets.htm

Blimey!

Royston

Posted: **Mon Aug 16, 2004 4:17 pm**

It is an indication of the steepness of the filter slope. The higher the number the steeper the slope.

I stand to be corrected, but I think 2 pole is a 6dB/octave slope and 4 pole is 12dB/octave.

All good synths should have this as a selectable option IMHO.

(edit) should have read the article first before answering...I was close, sort of.

R

<font size=-1>[ This Message was edited by: nprime on 2004-08-16 17:19 ]</font>

Posted: **Tue Aug 17, 2004 9:41 am**

I believe you need to double those numbers:

2-pole = 12 dB
4-pole = 24 dB
8-pole = 48 dB

Thomas

Posted: **Tue Aug 17, 2004 10:58 am**

Only if the tent poles all occupy the same place in the Laplace Transform domain graph, else you get portions of the frequency response graph with different degrees of slope [=head explodes=]

Royston

Posted: **Tue Aug 17, 2004 11:23 am**

And one Pole is me

Posted: **Tue Aug 17, 2004 12:49 pm**

Posted: **Fri Aug 20, 2004 3:03 pm**

What do you filter then Samplaire?

Posted: **Fri Aug 20, 2004 4:19 pm**

2 or 4, depending on his mood.

Posted: **Sat Aug 21, 2004 11:06 am**

Should we retitle this thread 'Poles with Filters'?

Posted: **Sat Aug 21, 2004 1:29 pm**

well, doesn't matter what sorta tent you want to build, but all I know is that my pole is bigger than yours. LOL

okay, maybe that was a bit korny.

Posted: **Sat Aug 21, 2004 4:44 pm**

It's not the size of the pole, it's the number of oscillations that it can handle!

R

<font size=-1>[ This Message was edited by: nprime on 2004-08-21 17:44 ]</font>

Posted: **Sun Aug 22, 2004 2:58 am**

Why, are there many earthquakes in Poland?

PlanetZ forums - scopeusers.com

Filters with 'poles'?