K35 Filter (in: DSP and Plugin Devel…)

By: Urs
2 May 05:22

If there is a nonlinearity in a filter’s feedback path, its cutoff frequency may – to a small degree – depend on signal levels, most obviously resonance. That’s true for analogue filters just like it is for their digital counterparts. Turn a Minimoog’s emphasis knob beyond self oscillation and the frequency will drop by several semitones.

(this btw. was one of the first filter examples we mathed out to remove the unit delay in the feedback path. That was before we started making models of filte…

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