[Speex-dev] Acoustic echo cancellation

Steve Kann stevek at stevek.com
Tue Jun 21 18:30:50 PDT 2011

Speaking of AEC (thought not quite on topic for this thread),

Has anyone on this list played with the GIPS code that google just
open-sourced?  It looks like their AEC also has code to handle differential
sample rates, though I haven't really evaluated it thoroughly.

There is really a lot of code in the drop ‹ basically all of the GIPS DSP
stuff (AGC, VAD, Denoise, echo canceller, etc), their transport layer,
hardware access (audio/video capture), etc.  It's all wrapped up to be part
of a javascript API in the browser, but it seems like the individual
components are useable without the rest.



From:  Steve Underwood <steveu at coppice.org>
Date:  Wed, 22 Jun 2011 09:05:16 +0800
To:  <speex-dev at xiph.org>
Subject:  Re: [Speex-dev] Acoustic echo cancellation

> On 06/22/2011 04:57 AM, Arun Raghavan wrote:
>>  On Tue, 2011-06-21 at 11:39 -0700, Arun Raghavan wrote:
>>  [...]
>>>  I'm also running this on x86 (x86_64, technically), and it's all
>>>  floating-point, so I guess this is a regression somewhere. Will try to
>>>  see if I can run it without any optimisations if possible, which I
>>>  assume should serve as an adequate reference.
>>  Surprisingly, if I use -O0 instead of -O2, I see a difference in the
>>  output. Nothing very observable in Audacity, but the actual output
>>  definitely differs.
> If you use a floating point build the output is likely to change with
> the optimisation level selected, the compiler version, and maybe even
> the day of the week :-)
>>  Still trying to figure out why they're both so different from your run
>>  from 5 years ago, though.
> Steve
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