I have some thoughts about gibb's phenomenon and how it is handled in today's DACs. When it comes to gibbs phenomenon and how the "ripples" can be handled, ie reduced, there is some written about windowing. But on the other hand, this means that the transition band becomes broader. Is that why many DACs have a stop band only at 24 khz rather than at 22 khz? Is it to reduce the effect of gibbs phenomenon?