Mnyb wrote: > On case anyone missed it . > > http://archimago.blogspot.se/2018/01/audiophile-myth-260-detestable-digital.html?m=1 > > Great blog by Arch as usual . > > The conclusion these ringing graphs are a red herring . They ate > interpretted out of context. > They are good if you want to understanf how the flter works . > > But properly recorded music do NOT ring because of this :)
There's a really interesting post on this subject in, of all places, Audio Asylum. A pro DSP guy named Werner set up an experiment wherein he made a minimum-phase low-pass filter (with no pre-ringing, but plenty of post-ringing) with a cutoff frequency of about 20 kHz. He looks at the impulse response of the filter. Then he places an FIR filter after it, with a cutoff frequency just a tiny bit higher than the 20 kHz value of the minimum-phase filter. Does it add pre-ringing to the result? No. That's because the pre-ringing of FIR low-pass filters is due to the presence of spectral content at the cutoff frequency of the FIR filter. But that content, in this case, has been removed by the minimum-phase IIR filter ahead of it, so there's no pre-ringing in the combined response at all. '_Here's_the_link_' (http://db.audioasylum.com/cgi/m.mpl?forum=digital&n=146584). ------------------------------------------------------------------------ andy_c's Profile: http://forums.slimdevices.com/member.php?userid=3128 View this thread: http://forums.slimdevices.com/showthread.php?t=108876 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
