[Speex-dev] Clicking Problems with slightly clipped audio

Coffey, Michael mcoffey at avistar.com
Tue May 22 12:06:15 PDT 2007

It appears that both the echo canceller and the noise reducer (NR)
introduce rather severe clicking artifacts when presented with audio
that has slightly overloaded the A/D converters. I am talking about
speech that sounds just slightly distorted, due to clipping, when simply
played back. If I pass that speech through the echo canceller or the
noise reducer, it acquires really loud clicks and/or scratchiness in
high amplitude sections.


Granted, it would be best if I could avoid any clipping in the first
place. A problem, though, is that we can not control end user behavior
and it is quite common for them to have their audio settings slightly
out of adjustment.


I've found a workaround, which is to divide everything by two before
sending it to the AEC or NR.


Is this a known problem? Would it be helpful for me to send a couple of
.wav files to illustrate?


Thanks again for the great contributions.




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