[Speex-dev] Echo cancellation diagnostic code

[Jean-Marc Valin]

> Thanks for the great work. It indeed helps to diagnose of echo
> canceller and narrow down the
> problem area.  

Good, so it worked for you?

> 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?

Theoretically, yes. In practice, I'm not sure how accurate it would be.
Do you have any samples you know have non-linear distortion?

	Jean-Marc

> 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
>> _______________________________________________
>> Speex-dev mailing list
>> Speex-dev at xiph.org
>> http://lists.xiph.org/mailman/listinfo/speex-dev
>>
> 
>