And besides, no one ever said that Olli's graph depicts analyitical frequency responses of continuous time interpolators. The graphs come from a musicdsp.org code entry:
http://musicdsp.org/archive.php?classid=5#49 There's no comment whatsover, just the code and the graphs. If you read his 65 page long paper on interpolators, he doesn't discuss analytical continuous time interpolator frequency responses whatsoever. He just shows their graphs, and tells where they have zeros in the response. No formulas for analytical frequency responses, at all - seemingly he is not interested in that. I just skimmed through his paper again, and the closest thing that he has in it, are polynomial approximations for frequency responses in the passband. About that's all, other than that, no frequency response formulas. -P _______________________________________________ music-dsp mailing list music-dsp@music.columbia.edu https://lists.columbia.edu/mailman/listinfo/music-dsp
