You're making exactly the same point I am making. I was just substituting the word "coarseness" for "frequency" in an attempt to make it more accessible for peo

You're making exactly the same point I am making. I was just substituting the word "coarseness" for "frequency" in an attempt to make it more accessible for people who have never studied this topic. I'm glad someone else sees the frequency space folly of the diffusion process. If I had time, I would test the hypothesis of doing all the learning in frequency space rather than trying to shape the profile of the noise. But I don't have time so feel free to steal my idea.