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Antti ladder filter implemented (float/fixed)

A project log for ModPod

Virtual modular synthesizer on 30x30mm

Matthias_HMatthias_H 11/20/2014 at 18:260 Comments

Just implemented Antti Huovilainen's 4-pole ladder filter (as described in http://dafx04.na.infn.it/WebProc/Proc/P_061.pdf, basic version without the extra tuning), and it sounds quite nice and smooth. No self-oscillation, though - hope that will come with the tuning. Fixed-point version, with hard saturation instead of tanh(), also operational and sounding good, but will require more tweaking.

Note, this is not tested on the device yet - only on the host system, but using the same basic audio engine in a different build configuration. There likely is a lot of room for improving sound and compute efficiency.

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