Filters with 'poles'?

Counterparts · Post by **Counterparts** » Mon Aug 16, 2004 6:57 am

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

Royston

Counterparts · Post by **Counterparts** » Mon Aug 16, 2004 8:59 am

"Tent poles", so it is!

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

Blimey!

Royston

nprime · Post by **nprime** » 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>

petal · Post by **petal** » 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

Counterparts · Post by **Counterparts** » 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

samplaire · Post by **samplaire** » Tue Aug 17, 2004 11:23 am

And one Pole is me

Post by **hubird** » Tue Aug 17, 2004 12:49 pm

Immanuel · Post by **Immanuel** » Fri Aug 20, 2004 3:03 pm

What do you filter then Samplaire?

blazesboylan · Post by **blazesboylan** » Fri Aug 20, 2004 4:19 pm

2 or 4, depending on his mood.

valis · Post by **valis** » Sat Aug 21, 2004 11:06 am

Should we retitle this thread 'Poles with Filters'?

kensuguro · Post by **kensuguro** » 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.

nprime · Post by **nprime** » 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>

blazesboylan · Post by **blazesboylan** » Sun Aug 22, 2004 2:58 am

Why, are there many earthquakes in Poland?