QRe: [sdiy] Reprinting Electronotes

[Scott Gravenhorst]

<ignorance>
Could someone here please provide a brief technical
description of what a "filter bank" is and what it is
generally (or can be) used for?

Also, why is the 2.1^(1/5) spacing significant?  Are there
other useful spacings?

Thanks much.
</ignorance>

Tim Ressel <madhun2001 at yahoo.com> wrote:
>
>--- jbv <jbv.silences at club-internet.fr> wrote:
>> As for "frequencies spaced at a ratio of 2.1^(1/5)",
>> how many bands per
>> octave does that mean ? Three ? Five ?
>> And what are the practical frequency limits (both
>> high & low ends) for
>> such a module ? 100 Hz to 10 KHz ?
>
>I just changed my CSound filter bank to 30 filters
>with the 2.1^(1/5) spacing and Q=25. Now I am getting
>the results I was expecting. I don't know why this
>should be different that what I had before, which was
>36 filters from 100 to 8K. But it works much better.
>
>Now that I got past that stumbling block, it is time
>for the next stage; a DSP filter bank module.
>
>--tr
>
>
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