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Comments
AUM internal clipper and saturator
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Here’s a 20Hz to 20kHz sine sweep to try on your favorite FX.
This is an interesting topic. But.. Could we get a bit of analysis with these maybe instead of just pics. I think most of us aren't that sure how to interpret these. The more arches and the more it looks like it is raining, the worse the aliasing? But also, as Hans mentioned earlier, if we don't know how hot the signal is that's going in, its hard to say how relevant these are, no?
Thnx Max. So the spectogram in these cases is just a faster way to diagnose this without having to actually listen to these sine sweeps?
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WOOTT “Bright Synths” preset:
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WOOTT “Dark Synths” preset:
The screenshots include the image of the unit so that you can see the knobs/faders/switches etc.
Haha, memorable quip at the end 😂
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You are becoming the aliasing police of the Audiobus forum. It looks like magic death eye stereo is oversampled. I am pleased to see that.
It is quite addictive.
Ran out of FX, so now testing sine sweeps directly from synths 😆
Yes, MagicDeathEyeStereo is set to 4x oversampling in this image.
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That saw looks excellent. I'm impressed. The super-saw not so much.
Sine wave oscillators usually don't have problems with aliasing and they don't require clever methods to antialias them. But to get a saw wave as clean as the one in your picture is non-trivial.
@Blue_Mangoo In other spectral analysers you get colour-coding to signify the volume of the signal, so yellow is loud and blue is quieter. It would be handy to have something like that in your analyser to give an idea of how loud the aliasing in these examples really is.
We are using this colouring:
Black=-90dB
Dark blue=-60dB
Light blue=-30dB
White=0dB
There are more than 90 different colours in the gradient so you should be getting better than 1dB accuracy in the volume estimate you get by looking at our spectrogram.
The human eye is not very good at objectively identifying colours so in practice a spectrogram is always kind of inexact but if you wanted to get photoshop out you could get the exact dB level.
Personally I find reading db levels from a spectrogram to be quite imprecise. When I want to measure the volume I usually use a spectrum view instead. We are planning to add a spectrum view feature soon.
Thanks for the explanation, it makes sense. The brighter the blue the louder the signal.
Drambo!!!
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@jolico: when you get that aliasing, are you checking your levels. Clipping and unintended saturation from driving things too hard can result in aliasing that doesn’t happen if one keeps signals in range. I wonder in some of these cases what impact reducing the input level levels would have.
Yes.
The sine sweep and it’s level is the same on all tests.
The FX input levels may vary, but they’re mostly on default or factory preset settings.
If you use those settings with a normalized signal, you will get aliasing.
Most EQs for example, don’t have any aliasing even at extreme settings like +24 per band, yet some simple EQs set to +3 show a lot of aliasing.
I would suggest for you to try some tests yourself with your favorite FX and settings.
You will discover sweet spots and settings to avoid etc.
Actual spectrogram Though you won’t enjoy the audio
Or slightly more listenable
@jolico I see red volume meters on output. In this case Drambo performs a naive hard clipping = tons of aliasing (just to protect your ears). Turn track volume down a bit and you will see that FIlter , Channel EQ or Pitch shifter is completely alias free.