[LAD] Wavetable synthesis : Creating fat wavetables
harryhaaren at gmail.com
harryhaaren at gmail.com
Fri Aug 24 20:35:29 UTC 2012
My intention is indeed to do "waldorf style" cascaded wavetables which are
interpolated between. I have a program that I can use to test the
wavetables, but the issue of tuning remains a problem for me.
I record a C3 note, 10 seconds of it. Then I want to create a wavetable.
Search for a zero crossing after 1 second, chop. Looped playback = C3.
Now I want to have a C#3, so 1/12 of the double of the frequency, playing
back at that rate will NOT always provide a C#3.
Why? The sample is the wrong length. The "fundamental" of the note is not
perfectly looped, not even all the harmonics are. Hence you "feel" a wrong
pitch. Its a bit of a wierd problem.
I've read this page, and figured I should probably check my algorithm that
does the rate and frequency calculations.
Has anybody got some experience in this domain? I'm new to creating my own
wavetables, so experiences / noob-advice welcome :)
On , Julien Claassen <julien at mail.upb.de> wrote:
> Hello Harry!
> It's an interesting topic, which I had been investigating. I do have a
> wavetable based hardware synth, but I was thinking about emulating it in
> software. Waldorf didn't say a lot about creating one's own wavetables.
> You might just as well try csound - or one of its accompanying programs -
> to create your wavetables. My synth works in such a way, that it has
> wavetables, made up from 128 samples. So you should be able to load such
> a wavetable into a sampler (is Specimin still state of the art?) and then
> use its envelope generators and filters and whatever else. I suppose the
> modular synthesizers like AMS, Om and co. might also do your bidding, if
> they allow to read samples or oscillator shapes. Perhaps even better then
> a sampler, since they might allow for modulating and otherwise mangling
> your wavetables. The question is, how many samples per waveform/wavetable
> they might expect.
> If you are thinking about wavetables completely the Waldorf way, that
> would include having a number of related waveforms stored in one table,
> so you can morf between them. I don't have the slightest clue, how to be
> realise that. There I would suggest PD or similar. I'm sorry,if that
> hasn't been much help.
> Warm regards
> Such Is Life: Very Intensely Adorable;
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