[Speex-dev] Echo cancellation diagnostic code

[William Zhang]

Hi Jean-Marc,

Thanks for the great work. It indeed helps to diagnose of echo
canceller and narrow down the problem area.  I am not an expert in the
signaling processing but I wonder if it is possible to add the
linearity check in the echo_diagnostic function?

Thanks,
William

On 3/16/07, Jean-Marc Valin <jean-marc.valin at usherbrooke.ca> wrote:
> Hi everyone,
>
> I think this should be interesting to all of those with echo
> cancellation problems. I finally check in some code to make these
> problems easier to debug. You'll need to have svn version for this.
>
> First, you need to manually define DUMP_ECHO_CANCEL_DATA in the
> compilation (sorry configure switch for now). With that, the AEC will
> automatically save the near-end, far-end and output signals to files
> (aec_rec.sw aec_play.sw and aec_out.sw). These are exactly what the AEC
> receives and outputs.
>
> >From there, you'll need to start Octave and type:
>
> echo_diagnostic('aec_rec.sw', 'aec_play.sw', 'aec_diagnostic.sw', 1024);
>
> (the value of 1024 is the filter length and can be changed)
>
> There will be some (possibly) useful messages printed and echo cancelled
> audio will be saved to aec_diagnostic.sw . If even that output is bad
> (almost no cancellation) then you probably have a recording problem.
>
> Cheers,
>
>         Jean-Marc
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