Tiar / SmashedTransistors Contributions

[SmashedTransistors]

tiar/filter/ZDF HP

see help patch in Menu Help -> library -> community -> tiar -> filter -> ZDF HP

A 12dB/oct "zero delay feedback" High Pass filter (with additional Low pass and band pass outputs).

It is based on a high pass Sallen and Key filter topology.

The algorithm has been finelly set to get good resonance and to limit glitching effects when using fast pitch modulation such as sharp attack enveloppes. (These glitches are a real plague in most high pass filters - digital and analog - that usually limits their usage with enveloppes).

[lokki]

hi @SmashedTransistors this is sort of off-topic, so sorry to put some noise into your contrib thread.

i seem to remember that you were working on an antialiased wavetable oscillator? have you made some progress in that regard? i have many 2048pts 256 cycle waves that i would like to use and while they all work fine in the bass register they alias very badly at high frequencies (because they have many overtones)....so, such an object would be great!

EDIT: what would be great is the waldorf way (simplified): calculate an fft representation of the wavetable (does not have to be on the axoloti, or could be a separate patch/initialisation object) then on playback you would have 128 or 256 sine oscillators that represent the signal. higher pitches would simply disable the higher oscillators thus avoiding aliasing.

another way i can see is to somehow filter the wavetable waveform to become more and more a sine wave at higher pitches, thus also avoiding aliasing.

[SmashedTransistors]

Hi @lokki,

Sure, I'm still working on such a wavetable generator.

It will use preintegration/differentiation for anti aliasing just like the PreIntegratedWaves objects (tiar/PIW).

At the moment I generated waveforms by formulas (like the tiar/PIW objects), I have not spent time on loading/preprocessing wavetables from files.