[sdiy] 40-band vocorder

[Kyle Stephens]

Meh, still learning these things, and with much help from your videos Aaron - I'm gonna cut your department a check sometime soon :)

But back on topic, vocoders and number of bands - is this a case of more being better or diminishing returns? Juergen Haible mentioned a vocoder project some time ago and said he'd keep the stage count down to keep the analog character.

Guess question stands as, is more better/what does it do for ya?


_Kyle

--- On Tue, 3/31/09, Aaron Lanterman <lanterma at ece.gatech.edu> wrote:

> From: Aaron Lanterman <lanterma at ece.gatech.edu>
> Subject: Re: [sdiy] 40-band vocorder
> To: "synth diy" <synth-diy at dropmix.xs4all.nl>
> Date: Tuesday, March 31, 2009, 8:22 PM
> 
> 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
> 
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