[Speex-dev] echo cancellation seg faults

[ac2491 at columbia.edu]

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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