[sdiy] Filter bank design

[Ian Fritz]

Hi JH --

At 08:24 AM 12/16/2002, jhaible at debitel.net wrote:

>Hi Ian - thanks for confirming this. The FB will be considerably smaller
>then.
>
>I will probably do a little variation: A LPF, to cover the low range,
>in parallel with the BPFs in the kHz range. Then running the whole thing
>in series with a parametric EQ.
>
>Maybe a FB that's restricted to 500Hz ... 10kHz could even comfortably
>done with LC filters (as the biggest inductors would be in the lower
>bands), but this would either mean winding my own inductors, or using
>standard L values (and selected C's of course) and having slightly
>different Q from one BPF to the next.
>But probably I'll use an LC filter topology with gyrators.

Sounds interesting.  I've never tried gyrator-based filters.  Any idea how 
the noise performance might look?

   Isn