Hi everyone,
is there a module which can handle the foldbacks created by aliasing back to the audible spectrum? I can see a simple distortion module creates a lot of aliasing. Is there an oversampling module in existence? How everyone else handles this?
thanks!
No, there isn’t. It’s a pity because distortion produces quite a lot of it. It is possible however to do some kind of oversampling with Csound. I wrote a basic instrument to do this some years ago1, but a better Csounder than I, @Oeyvind, shared what I assume a better solution to the Csound list last year. I’m sure he doesn’t mind if I report it here.
oversampling.zip (208.8 KB)
[1] I’ll try to find that instrument. I see in an email to a friend I mention how I have it working pretty well, but I never sent the instrument code. But the email is about 2 weeks newer than my last code example 
It will be on a machine somewhere I suppose…
Not a better Csounder than you Rory! but thanks anyway.
I had a look at our email exchanges from when we pondered this the last time (summer 2020), and I found this zip file from you. Maybe this is the one you were looking for, @rorywalsh?oversampling_Rory_august_2020.zip (943 Bytes)
Thanks @Oeyvind, to be honest, it was so long ago that I can’t recall if this is the final version or not. But I think @rootnote should have enough to go on here 
Happy new year btw! I hope to share a beer with you at some stage in 2022!
thank you ! I will go through now 
I’m not sure how efficient either of these approaches are. You might want to check your CPU at some point
working on 88200 or 96000khz is also solution.
