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Author Topic: ARP 2600_Single Oscillator_Aliasing Issue?  (Read 175 times)

Joel_M_Peel

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ARP 2600_Single Oscillator_Aliasing Issue?
« on: October 26, 2016, 09:47:06 pm »
Hello,

I'm not quite sure if what I am hearing is an aliasing issue or an emulation of something that actually occurs on a real ARP 2600, but when I play a single oscillator (sine, square, triangle, etc.) I hear this very low in volume frequency shifting noise (approx. -66 dB RMS on a spectrum analyzer) that approaches the fundamental from both sides of the fundamental.  It's much more apparent on a sine wave due to it not being masked by overtones of other oscillator types.  It may even be indistinguishable on most speaker/headphones, but my AKG K812s pretty much reveal every single detail.   

Here's a screen capture showing the issue in Ableton's spectrum analyzer:
https://drive.google.com/open?id=0B7hnclNeu3TMelVBTEUtaFIyNEk

Joel_M_Peel

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Re: ARP 2600_Single Oscillator_Aliasing Issue?
« Reply #1 on: October 27, 2016, 04:53:38 pm »
This was actually supposed to be for VCollection 5

LBH

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Re: ARP 2600_Single Oscillator_Aliasing Issue?
« Reply #2 on: October 28, 2016, 01:45:00 am »
Hello,


FYI. You could have posted in VC 5 too and attached a image, and deleted this thread. But now i answer here.

REPLY:
I have not seen your link. I don't seem to work for me.

If it's aliasing, then aliasing is quite normal in a digital system like a softsynth i believe. I think it's depended on the used samplerate in the application, and that you can do something about it like using oversampling techniques, but i don't think you can fully avoid it.
The frequences that's being affected is hard to say, but also depending on the samplerate i think.
I don't know what samplerate Arturias synths use. I would like to know, and i would like an option to use oversampling. But the better the quality the more CPU usage. So there is things to consider.
I'm not a technician, so this may not be correct.

The main thing is, if it's audioble and in a bad way or not. What do you think? Is it audioble? Is it bad?

Have you tested any softsynth that don't have behaviors like you describe?
I would also like to know, what you think you see on that spectrum? Especially what you see, but does'nt see in other softsynths.

I'm not saying nothing is wrong, and that it can't be better etc.. But what do you wan't to say and get out of your observations and posts here and in the VC5 Modular forum?


 

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