Speex dev - Aug 2004 - Echo Cancellation

Hello,

 

I am testing speex 1.1.6's echo canceller. I am using testecho.c, with a
few modifications to get it to run on Windows. 

My problem is that I am unable to get the echo cancellation to work
correctly. I am working on an audio conferencing software, and one issue
we have is sometimes the microphone picks up what is being played
through the headset, resulting in an echo of the other person who is
talking. In order to test this scenario through the echo canceller, I am
running two samples through it. The first is the signal I want to clean
- it is my husband talking, with an echo of myself talking. The second
sample is the reference sample - it is just myself talking. (I used the
second sample to create the first, so it is the exact same wav, with my
husband's speaking placed on top of it.)

 

The result has my husband speaking clearly, but the echo of myself
talking is garbled and sounds like the Borg Hive from Star Trek. It's
more distracting than the original signal was. I have tried introducing
delays to my echo, but it does not help the signal to become clearer. 

 

I think I am doing something wrong, but I am not sure what. I notice you
are using two samples - play.sw and ref.sw - which are not included in
the source. What do they sound like? Is there a place one can pick up
these files? Is this echo cancellation designed more for musical tones
instead of actual echoes of speech? I know this is experimental and I
feel I may be using it in the wrong way.

 

If you want, I can email my samples and the resulting output.

 

Thank you for your support and for a great product,

 

Shana

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Hi,

Keep in mind that the echo canceller is still experimental. There are
still lots of problems, including instability and all. I provided it so
people who know something about echo cancellation can start playing with
it, but it is definitely not ready for general use.

	Jean-Marc
> I am testing speex 1.1.6?s echo canceller. I am using testecho.c, with
> a few modifications to get it to run on Windows. 
> 
> My problem is that I am unable to get the echo cancellation to work
> correctly. I am working on an audio conferencing software, and one
> issue we have is sometimes the microphone picks up what is being
> played through the headset, resulting in an echo of the other person
> who is talking. In order to test this scenario through the echo
> canceller, I am running two samples through it. The first is the
> signal I want to clean ? it is my husband talking, with an echo of
> myself talking. The second sample is the reference sample ? it is just
> myself talking. (I used the second sample to create the first, so it
> is the exact same wav, with my husband?s speaking placed on top of
> it.)
> 
>  
> 
> The result has my husband speaking clearly, but the echo of myself
> talking is garbled and sounds like the Borg Hive from Star Trek. It?s
> more distracting than the original signal was. I have tried
> introducing delays to my echo, but it does not help the signal to
> become clearer. 
> 
>  
> 
> I think I am doing something wrong, but I am not sure what. I notice
> you are using two samples ? play.sw and ref.sw ? which are not
> included in the source. What do they sound like? Is there a place one
> can pick up these files? Is this echo cancellation designed more for
> musical tones instead of actual echoes of speech? I know this is
> experimental and I feel I may be using it in the wrong way.
> 
>  
> 
> If you want, I can email my samples and the resulting output.
> 
>  
> 
> Thank you for your support and for a great product,
> 
>  
> 
> Shana
> 
> 
> _______________________________________________
> Speex-dev mailing list
> Speex-dev@xiph.org
> http://lists.xiph.org/mailman/listinfo/speex-dev

> The result has my husband speaking clearly, but the echo of myself
> talking is garbled and sounds like the Borg Hive from Star Trek. 
*chuckle* I better get a snapshot quick while the Borg Hive still lives. ;)

But seriously, what was the attenuation of your contributed "echo"
signal in
the test file?

=MB=