[Speex-dev] AEC troubleshooting

Greger Burman greger at mobile-robotics.com
Tue Aug 11 01:14:40 PDT 2009

I actually forgot to mention that I'm using ultra-wideband mode, but seems
like you understood that anyway. Is this true that Speex echo cancellation
only performs well in narrowband mode !?
I've been using 100 ms as the default tail length. I don't know what the
ideal tail length would be. I have tried shorter and longer tails but it
hasn't made any difference.
Does DirectSound's AEC perform well with high quality recording? Is it the
general opinion that it performs significantly better than Speex AEC?
2009/8/10 Tim Na <hna at alu.edu>

>  If you search the mail archive, you will see that people were only
> successful using narrowband with long tail length.
> Unless you have speaker input in perfect sync with mic input, it is
> difficult to use Speex AEC.
> If you don't have restriction on using Vista's AEC DMO or XP"s DirectSound,
> I would recommend using those.
> Tim
>  ------------------------------
> *From:* speex-dev-bounces at xiph.org [mailto:speex-dev-bounces at xiph.org] *On
> Behalf Of *Greger Burman
> *Sent:* Monday, August 10, 2009 5:40 AM
> *To:* speex-dev at xiph.org
> *Subject:* [Speex-dev] AEC troubleshooting
> I'm experiencing little to no damping of acoustic echo from the echo
> cancellor and I can't figure out why so far. I thought I should try the
> echo_diagnostic tool so I built libspeex.dll and libspeexdsp.dll with the
> DUMP_ECHO_CANCEL_DATA flag, but I'm not getting any output files at runtime.
> Any ideas?
> Build information:
> Speex version: 1.2rc1
> Target Win32 x86
> MS VC++2008 EE
> Configuration: Release, Full optimization, _USE_SSE
> --
> Greger Burman
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