[Speex-dev] echo cancellation seg faults

[Jean-Marc Valin]

Then your signal is probably just too low, so it can't adapt. For
example, if you send zeros, there's no way to adapt. This temporary
adaptation phase is always used at the beginning until some minimal
adaptation is done. Seems like the conditions for that aren't met for
your setup.

	Jean-Marc

On Wed, 2006-07-19 at 20:54 -0400, ac2491 at columbia.edu wrote:
> Hi,
> 
> I tried keeping it for a very long time and put logs there and it
> always went to not adapting.
> 
> This is how I initialize speex_echo_cancel
> 
> SpeexEchoState* _echoState = speex_echo_state_init(160, 320*10);
> 
> I have 20 msecs of audio with 16bits for a sample.
> 
> 
> If two frames are identical and are given to speex_echo_cancel for
> many iterations, should I expect silence.
> 
> Thanks
> -Anurag
> 
> Quoting Jean-Marc Valin <Jean-Marc.Valin at USherbrooke.ca>:
> 
> > Probably the level of your signal is too low and/or you're just
> > not
> > letting it time to adapt.
> >
> > 	Jean-Marc
> >
> > Le mercredi 19 juillet 2006 à 19:00 -0400, ac2491 at columbia.edu a
> > écrit :
> > > On closer looks and debugging I always end up in
> > >
> > > speex_echo_cancel function with comment
> > > /* Temporary adaption rate if filter is not adapted correctly
> > */
> > >
> > >
> > > Does this give any clue to the problem? I wonder why it would
> > not
> > > find its mirror image as an echo and do echo cancellation?
> > >
> > > Any insight is appreciated. If you need some more data, tell
> > me.
> > >
> > > Thanks
> > > -Anurag
> > >
> > > Quoting ac2491 at columbia.edu:
> > >
> > > > Hi,
> > > >
> > > > If I pass the same ref and the echo data to the echo
> > cancellation
> > > > API, I am expecting silence as output. I get back the
> > original
> > > > audio data. Is this correct?
> > > >
> > > > Thanks
> > > > -Anurag
> > > >
> > > > Quoting ac2491 at columbia.edu:
> > > >
> > > > > Hi Jean,
> > > > >
> > > > > I got the earlier problem fied with correct NN and tail
> > values.
> > > > > But
> > > > > I dont see any echo being cancelled. To the echo cancel API
> > I
> > > > am
> > > > > giving, audio packets that are being played currently and
> > audio
> > > > > packets that are captured from the mic.
> > > > >
> > > > > Since the audio packets being played came from machine B
> > (as in
> > > > a
> > > > > normal VoIP call), could this be a potential problem? As
> > the
> > > > > packets being compared originated at different machines.
> > > > >
> > > > > Thanks
> > > > > -Anurag
> > > > >
> > > > > Quoting ac2491 at columbia.edu:
> > > > >
> > > > > > Hi,
> > > > > >
> > > > > > For my VoIP application machine A sends speex encoded
> > audio
> > > > of
> > > > > to
> > > > > > machine B and vice versa at. Data is captured in PCM
> > 8Khz, 16
> > > > > bit
> > > > > > and then encoded using speex 1.1.12
> > > > > >
> > > > > > The packet A played and the packet A captured through mic
> > are
> > > > > the
> > > > > > input to speex echo canceller. So I am trying to remove
> > > > traces
> > > > > of
> > > > > > packet A played from the captured data. I have followed
> > > > example
> > > > > > testecho.c
> > > > > >
> > > > > > All I hear is some metallic sounds and after some time
> > there
> > > > is
> > > > > > an
> > > > > > illegal memory reference in mdf.c filter_dc_notch16
> > function
> > > > at
> > > > > > spx_word16_t vin = in[i]
> > > > > >
> > > > > > Any clues as to what is going wrong?
> > > > > >
> > > > > > Thanks
> > > > > > -Anurag
> > > > > >
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> 
>