MATRIXSYNTH: JH. Fixed Filter Bank


Saturday, April 10, 2010

JH. Fixed Filter Bank

full details here
"The old Moog® Modular System had an option of two different Fixed Filter Bank modules, one with 10 bands, and another one with 14 bands. ("Moog" is a registered Trademark of Moog Mucic (http://www.moogmusic.com).

Both are very unique-sounding, mostly because of the deep notches they produce between adjacent filter bands. Some people also claim it's becuase they used real inductors - wire-wound components that get nonlinear at higher signal levels. I'm not sure if the latter really is such an important factor, because thes efilter banks were designed in a way that in each filter band the signal first passes thru a resonant LC-filter at a certain level, and then passes a second LC-filter at a lower level. So my conclusion would be that the second LC-stage filters out whatever distortion products may or may not be created in the first stage. But then again, a tiny amount of harmonocs may survive, and others may have better ears than I and might hear a difference.

Anyway: I decided to make a PCB that allows both options: real inductors, or electronic inductors, so you can choose for yourself."

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