[sdiy] 40-band vocorder

[Aaron Lanterman]

On Mar 31, 2009, at 11:11 PM, Ian Smith wrote:

> I have to admit, I was the "more pole" guy... yes, that's me... the  
> Tim Allen of the analogue world. So since 40 bands is a bit  
> excessive, would doing the same level adjusting... attenuating I  
> guess on the filters be interesting?
> -Ian (more knobs is better) Smith
>
> ----------------------------------------
>> Date: Tue, 31 Mar 2009 19:41:30 -0700
>> From: lightburnx at yahoo.com
>> Subject: Re: [sdiy] 40-band vocorder
>> To: taciturn_unquiet at hotmail.com
>>
>> Anyhoo, yeah, as said it's one of those cases where more isn't  
>> necessarily better. Someone a while back asked about a "more pole"  
>> filter (that is one having more than the standard 2-4), and thing  
>> is a 3 doesn't sound much different than a 4, and it's less and  
>> less after that.
>>
>> Another thing that filter stages do is phase shift the signal by 45  
>> degrees, and there's other EE stuffs that make this not neccicarily  
>> something you want.

Uh - wait a minute - it depends on what those various poles are doing.  
If you're talking about a straight  lowpass, sure, you won't notice  
much of a difference beyond 4 poles. But if you're setting up specific  
resonances, bring on those poles!

Also, make sure you're making a distinction between cascading filters  
and adding the outputs of individual filters. A filterbank adds the  
outputs of the specific filter. The 4-poles referred to above are in  
cascade. Apples and oranges.

- Aaron