[sdiy] Obtaining Bandpass and High-Pass Functions From A Four-Pole Low-Pass

Andrew Simper 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>
wrote:

> 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.
>
> MC
>
>
>
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
amp.

Andy
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