[sdiy] Reprinting Electronotes

[Theo]

Sorry for my ignorance, but what is so bad about filters spaced one octave?
Both the 30 band  EQs I misuse as fixed filter banks list octaves in the
frequency bands.
Seem to sound OK though.

On the tight spacing part, the tight spacing kind of makes up for the
filters not being tunable.
Think wider spacing would be a pity.

Theo



From: jhaible <jhaible at debitel.net>


> > return our focus to the
> > thing that brings us all together, synth diy?
>
> AMEN !
>
>
> On topic:
>
> Filter bank spacing of 2.1**(1/5) : This is to get roughly
> 5 filters per octave (quite dense spacing), while avoiding
> two filters being spaced exactly an octave.
> (5 filters per octave would be 2**(1/5). )
>
> I wonder why we need such tight spacing in the low
> range, however. If you take a violin, the upper modes
> of the wood resonance are very close to each other
> (thus using a filter bank to get a "string filter").
> But in the lower range, you have just a couple of
> singular resonant peaks (air resonance and fundamental
> of wood resonance), haven't you?
>
> JH.
>
>
>
>