On Sun, Dec 23, 2012 at 10:06 PM, Chris Bannister <cbannister@xxxxxxxxxxxxxxx> wrote: > So artifacts (transient peaks) on the trailing or leading edges of a > square wave is not a form of ringing? In this case, yes. They're a fundamental aspect of any bandlimited signal and you'll see them even when the filters are all FIR. You can see also them on any scope-- so long as the scope has a greater bandwidth than the squarewave you're inspecting (perfect squarewaves require infinite frequencies, and so do not actually exist). And, like I said, you can massage the frequency response of a filter to hide the ripples and overshoots by spreading the Gibbs effect over a wider spectral area, giving the illusion that they're not there when you look at it on a scope. That's mostly a trick of presentation. Your ear doesn't care (though your circuits might, if you're trying to limit the analog signal range). You could also have a filter that really is adding ringing, but that's something different. Monty _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
