[sdiy] Obtaining Bandpass and High-Pass Functions From A Four-Pole Low-Pass
andy at cytomic.com
Tue Oct 16 03:43:32 CEST 2018
On Tue, 16 Oct 2018 at 02:27, Michael E Caloroso <mec.forumreader at gmail.com>
> The Moog Voyager implements high pass by summing low pass output
> (whose passband is out of phase) with unfiltered input. Works for
> slopes from 1 to 4 pole. Old trick from the Moog modular.
This trick doesn't give you very good results, but it's definitely better
than nothing! Correct weighted summing of multiple filter taps is much
better, but also means you need 3 more differencing amps to get each stages
outputs from the transistor ladder, instead of just the final differencing
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