string filter bank (was: Re: [sdiy] 40-band vocorder)

[Andrew Simper]

Would it be any good to use a few short bbd chips, using two for a 
bi-directional delay line with feedback to get a large number of peaks? 
These peaks could then be generally shaped to the right spectrum with a 
few eq filters, and the bottom 5 or so resonances could be modeled with 
individual filters. I have no idea of what spacing you need it in the 
upper frequencies for a good analog string filter, so I'm happy to learn 
that a vast number of finely tuned filters is the only way to really do it.

Andrew Simper

David G. Dixon wrote:
>> ... that was a thought I had. I too love this thing.
>> But then again, when not using this circuit as originally intended I'm
>> not sure if you really need 40 fixed bands.
>> For that sounds Scott posted a good handful of tunable filters should
>> do it (hence my question about the number of bands involved).
>> Besides the wiring I wouldn't have the space for such a big panel.
>> I definitely need to do a lot more reading about bandfilters.  ;-)
>>     
>
> There are some pretty small PCB mount pots.  One could probably design a
> board and panel layout that were pretty small, and just have the one module
> in your system which has an array of little bitty knobs -- but just for the
> individual band gains, not for the other knobs -- that might look pretty
> cool.  I've been toying with the idea of an attenuator patch matrix
> (basically a grid of pots) which would be more or less the same idea.
>
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