[Speex-dev] Echo Cancellation

[Jean-Marc Valin]

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 at xiph.org
> http://lists.xiph.org/mailman/listinfo/speex-dev