Digital systems do have aliasing, and that's like IMD except one of the source frequencies is the sample rate. So you can get aliasing with only a single pure tone. I guess you could call is inharmonic distortion but I'd rather call it what it is: aliasing.Thank-you.
The problem is if you call it aliasing without acknowledging that its also distortion, it leads to confusion (if there is IMD or THD, they make artifacts not found in the original signal, why should aliasing catch a break?). Distortion is really the more accurate term. And its so audible that in the old days it was criminal. No analog system ever had artifacts like that (unless is was badly malfunctioning)!
So I think you can see that I regard calling it 'aliasing' without also speccing it as a distortion is disingenuous. Its simply a way of hiding a rather serious artifact and hoping no-one will notice. But it did get noticed and is why the LP is still very much alive today!
So, if you **include** aliasing artifacts in with the THD spec of a typical digital system, what does that number look like?

