Clarity on Ken Stone's Bi-N-Tic Filter

[knutolai]

I've been trying to read up on this strange filter circuit (and switched-cap filters in general) and I find the principles to be a little over my comprehension. The website call it a multi-passband- / comb-filter. I'm guessing this means the response of a feedforward comb filter (shown below).


As I said the principles of there switched-cap filter is a bit above me, but it looks to me like the output from the switched-cap filters are sent to both the output and back to the input of the filter. Is this really a feedforward comb filter and is there any simple way to reshuffle the filter to make a feedback comb filter? And does anyone have any insight on the frequency response of the bi-n-tic filter?

Link to the filter article:
http://www.cgs.synth.net/modules/cgs57_bintic.html
Wikipedia on comb filters: (check the different freq responses for feedback and feedforward configurations)
http://en.wikipedia.org/wiki/Comb_filter

[Mark Hammer]

[knutolai]

Haha oh well