23 Oct
2016
23 Oct
'16
1:13 a.m.
On Sat, 22 Oct 2016 15:50:22 +0000
Fons Adriaensen <fons(a)linuxaudio.org> wrote:
On Sat, Oct 22, 2016 at 04:30:00PM +0200, Johannes
Kroll wrote:
[...]
Because there isn't any that really works.
The basic reason is that the combined response of speaker, room
and mic in a typical PA situation is very irregular with hundreds
if not thousands of very narrow peaks, and the frequency of those
peaks is very sensitive to small movements of almost everything.
Simple tricks like adaptive notch filters will maybe give you a dB
or so extra, but there it ends.
The only thing that can work sometimes is shifting all frequencies
up or down by a few Hz, smoothing out the peaks. Simple to implement,
usable for speech but usually not for music because it will appear
to be out of tune.
That's a good hint, thanks. I could try the AM Pitch Shifter or Bode
Pitch Shifter LADSPA plugins. That could be a good enough solution for
me, if it doesn't change the sound too much.