[Speex-dev] echo cancellation seg faults

Jean-Marc Valin
Wed, 19 Jul 2006 16:30:26 -0000

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 ? 19:00 -0400, ac2491@columbia.edu a ?crit
:
> 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@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@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@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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