WTF Oscillator

[martinvicanek]

Sorry, Tula, I shouldn't just throw this at you without further explanation. My schematic is inspired by your post but it is by no means a clone of the product which you linked to. I tried to incorporate some of the essentials and added basically the phases and the detuning which seemed sorta obvious.

I updated the above post with labeled knobs and synced scopes so you can see what is happening as you work your way. Hope it is clearer now, if not just shout.

[Spogg]

Yeah I had to add scopes to the original to work out what was going on!

I do wonder if the range of spectra produced is any different to that created by just switching between two waves at some point of the ramp. I like the novel metaphor of “opening a window” of course, but does it sound different and/or better in some ways than just switching?

What might be good is a “tapering” of the window edges, so there is a smoothed interpolated transition between the two waves, rather than a sudden harsh switching which produces all those high harmonics. Of course in an actual synth you could just apply a low pass filter to suit.

Just thinking out loud…

Cheers

Spogg

[Phil Thalasso]

Thank you very much Martin.
I've been experimenting with it all morning.
Have a good sunday.

Regards
Phil

[adamszabo]

Very interesting ideas, I tried to further improve Wassakas design, and I think this is how they do it. I used martins polyBLEP saws to create a polyBLEP PWM, and use that to multiply the two input oscs, and it seems it reduces aliasing even more this way.

[tulamide]

Alter Falter!

(Sorry, didn't know how else to express my mixture of high regard and excitement)

You guys are awesome! I can't believe you all did this in a few hours each. Next step: Smooth stepping through various waveforms (modulatable), see second posted video

[adamszabo]

Now that is called a Wavetable oscillator, much harder to do

[BobF]

Hello adamszabo,

Very cool indeed! Now like Tulamide said if you can add the second one at the peak like they do in the 2nd video and morphing you could rule the word, ha, ha.

Thanks for your contribution, BobF.....

[Wassaka]

This time I tried to make a wavetable oscillator using the multiple mix method, it works fine but it consumes a high CPU (relatively), but I hope someone does it better or just optimizes my version ...
Maybe this can help you to get a first idea
Check it out! @tulamide

[tulamide]

Ah, thank you, Wassaka!

I see what you did and start to understand, why it is so difficult to make in Flowstone. You only deal with 6 waveforms, but because they all have to run simultaneously, the CPU load is already relatively high.

And if you don't use oscillators you would have to deal with one wavetable per waveform which also isn't reducing the payload. And an arithmetic oscillator would be way to complex.

But how the heck does it work outside of Flowstone? What technique are they using?

[adamszabo]

Normal wavetable oscillators load a long wavefile with many different waveforms inside. So lets say there is a sine, saw, square, triangle etc... Then you create two "readers", one that gets the even, the other gets the odd waves. Then you create oversampled oscillators to play the waves and interpolate between them.