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kwfkaymfb
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Joined: 01/29/2016 - 14:13
Buzzing in sub osc (modular)

In the lower octaves there is like a high frq buzzing or ringing sound? It's kinda weird actually I was considering posting a question about how to make this bass sound. https://youtu.be/zynTWAUK5mc (viper ~ my hops)

then I was playing around with the modular and heard it, anyone know what the deal is here?

kwfkaymfb
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Joined: 01/29/2016 - 14:13
Here's an example in caustic,

Here's an example in caustic, the fm does it too, it seems to be only on certain notes...

Caustic Song file (optional): 

paulovski
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Joined: 09/19/2012 - 06:13
It's called 'aliasing'. I won

It's called 'aliasing'. I won't go into the details. Google it. There's not a lot that can be done to stop it happening, here. It's quality vs quantity. Run it through a low pass filter, of some kind. The lag processor is good for this.

kwfkaymfb
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Joined: 01/29/2016 - 14:13
Hey thanks alot man, its

Hey thanks alot man, its beyond me all that technical stuff tho haha

mike
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Joined: 12/18/2011 - 15:53
> Hey thanks alot man, its

> Hey thanks alot man, its beyond me all that technical stuff tho haha

Ever seen pixels close up? They are jagged stair steps, graphic rendering smooth those out so we see soft lines. This is aliasing and where anti-aliasing comes from.

DSP processing has jagged steps(sample to sample) when certain calculations(eg nyquist frequency reached) are done and need to get rid of that aliasing ( smear the edges).

Since Caustic was made in 2010, Rej had to make optimizations, one is this and it takes a lot more horse power to get rid of it.

Just try making a track out of it. ;-)

The aliasing is like throwing a rock at a wall and there is more velocity left when it hits the wall, so it bounces back INTO the room. Too high of frequencies bounce back into the original waveform.

"Nyquist Frequency. The maximum frequency beyond which aliasing will occur is called the Nyquist frequency. Above Nyquist frequency, seismic signal with higher frequencies are reconstructed in the form of seismic signal with lower frequencies."

kwfkaymfb
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Joined: 01/29/2016 - 14:13
Rrrrrrrriiiiiiggghhhhttt....

Rrrrrrrriiiiiiggghhhhttt.... that makes sense somewhat, so the sine wave is like too broad for the sample rate? Kinda? I have no idea what I'm talking about haha. Like I said, I was gonna ask how to make a bass like this, it can actually sound pretty cool. howcome the subsynth doesnt do it? Thanks for input man.

kwfkaymfb
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Joined: 01/29/2016 - 14:13
Wait, so its freqs in the

Wait, so its freqs in the waveform being amplified? My heads racked from this D; 

kwfkaymfb
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Joined: 01/29/2016 - 14:13
Even the waveform gen doesn't

Even the waveform gen doesn't do it D;

mike
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Joined: 12/18/2011 - 15:53
> so the sine wave is like

> so the sine wave is like too broad for the sample rate? Kinda?

Almost, yeah you get the idea, the reason VST are expensive is because this code is inside to anti-alias and give butter smooth filters, osccilators etc.

Rej could do it for sure, he just wanted synths to run on Android Gingerbread. HAHA. :)