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If more than one speaker receives the *same* signal, it doesn't matter the number of speakers. It only gets tricky when the speakers are playing slightly different signals (e.g. from a stereo song). Jean-Marc Quoting Greger Burman <greger at mobile-robotics.com>: > One thing I can think of is if you are using two or more speakers. If the > speakers are not at the exact same distance from the mic, you will get more > than one echo. AEC can not handle that. Try disconnecting all but one > speaker and...

...uced and what the best practices are. > > > If you want to profile with symbols, you know you can compile a release > build with symbols, right? The CodeAnalyst documentation describes > how to do that with Visual Studio. (I've done it.) Ok. thx. > > > Tom > > Greger Burman <greger at mobile-robotics.com> wrote: > > > > I have a question about the overall performance of Speex and what I can > do > > to improve it. I'm running Speex Windows x86, Visual C++ EE compiler. I > will > > say right away that I've only compile...

On 2010-03-16 06:35, Greger Burman wrote: > Ok. Thanks J-M for clearing that up. > What if you mix up the polarity on one speaker (180 degree phase > change), would that matter? Not at all. It's still all linear. You can even apply a different equalizer to each speaker and it'll still be linear. Jean-Marc...

...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? cheers Greger 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 h...

Quoting Greger Burman <greger at mobile-robotics.com>: > The reasons I have posted these questions are: 1) To find out if Speex can > take advantage of SIMD extensions. If you define _USE_SSE, CELT is already able to use SSE instructions. You must be careful on Windows though because it doesn't...

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...ker. (ASIO Soundcard provides interface for that) So if I am remebering correctly, with data from Mic and Speaker in sync, speex AEC should do the job. Tim _____ From: Guilherme Balena Versiani [mailto:guibv at comunip.com.br] Sent: Tuesday, August 11, 2009 1:33 PM To: Tim Na Cc: 'Greger Burman'; speex-dev at xiph.org Subject: Re: [Speex-dev] AEC troubleshooting Hello Tim, Please explain exactly what you are meaning by "expose speaker input as other OS". Did you reference system latency? If you do so, I would like to understand better how the acoustic echo cancella...

Has anyone else experienced high CPU usage when using RSYNC in windows 2000 server? I am using the rsync.exe (and applicable DLL's) from the cygwin installation (I am not however running cygwin on this machine). The linux machine connecting to the windows rsync daemon has a very low performance hit when the session is running (see below). However, the windows machine, which has a much

Hello. I have the following situation. AEC is used in network chat software over DirectSound API. Echo and reference signals are almost aligned (delay is no more than 30ms). When echo is emulated in notebook (built-in speakers + mic) everything goes fine and echo is cancelled. But when configuration includes stand-alone speakers and mic no echo is removed. Audio is in 22050 hz at 16 bit

...only have a few different transfer functions, that may be an option. For time-varying spatialization with many (>2) channels, forget about AEC unless you're willing to spend a *lot* of time on that. Jean-Marc > Thanks, Josh > > > >> Jean-Marc >> >> Quoting Greger Burman<greger at mobile-robotics.com>: >> >>> One thing I can think of is if you are using two or more >>> speakers. If the speakers are not at the exact same distance from >>> the mic, you will get more than one echo. AEC can not handle >>> that. Try...

...rm well in wideband (16kHz) or ultra-wideband (32kHz) mode? I read somewhere that you need a longer tail length for higher sample rates. Measured in samples it will of course be longer, but it could be interpreted as longer measured in milliseconds for higher sample rates. Someone please clarify. //Greger -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/speex-dev/attachments/20090812/ef82f5f0/attachment.htm

...I heard Speex AEC works great from developer who used windows with ASIO Soundcard. Vista AEC DMO or XP DirectSound AEC function does reasonable job and that's what I am currently using. Tim _____ From: speex-dev-bounces at xiph.org [mailto:speex-dev-bounces at xiph.org] On Behalf Of Greger Burman Sent: Tuesday, August 11, 2009 1:15 AM To: speex-dev at xiph.org Subject: Re: [Speex-dev] AEC troubleshooting 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 narr...

Ok. Thanks J-M for clearing that up. What if you mix up the polarity on one speaker (180 degree phase change), would that matter? cheers Greger 2010/3/15 Jean-Marc Valin <Jean-Marc.Valin at usherbrooke.ca> > If more than one speaker receives the *same* signal, it doesn't matter the > number of speakers. It only gets tricky when the speakers are playing > slightly > different signals (e.g. from a stereo song). > &...

Hello? I am a new user of speex.I am currently working on speex frames and I have some questions. I am using narrowband and long tail length, and it works very well with speex test DEMO. But it is very difficult to have speaker input in perfect sync with mic input. Speex does not work at all. Any suggestion? Regards? -------------- next part -------------- An HTML attachment was scrubbed...

...OISE Turns denoising on(1) or off(2) SPEEX_PREPROCESS_SET_AGC Turns automatic gain control (AGC) on(1) or off(2) I noticed that setting a value of 0 turns the setting off. Setting a value of 1 or 2 turns the setting on. While I do think 1 and 0 is more logical, it contradicts the documentation. -- Greger Burman -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/speex-dev/attachments/20090529/bfd3545a/attachment.htm

...vise on how to boost the performance with as little code rewrite as possible. The architecture for release build will be SSE/SSE2 capable. 1) Compiler optimizations: Recommended options? 2) SIMD. Is Speex written to take advantage of SIMD architectures? What must I do to take advantage of this? -- Greger Burman -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/speex-dev/attachments/20090615/b0fbc690/attachment.htm

...t also has extra checks that may have a significant performance impact depending on the code. If you want to profile with symbols, you know you can compile a release build with symbols, right? The CodeAnalyst documentation describes how to do that with Visual Studio. (I've done it.) Tom Greger Burman <greger at mobile-robotics.com> wrote: > > I have a question about the overall performance of Speex and what I can do > to improve it. I'm running Speex Windows x86, Visual C++ EE compiler. I will > say right away that I've only compiled debug so far and used no co...

...thinking of using Speex AEC in the context of a virtual environment using OpenAL for spatialized sound. Is there any hope that this could work? What could we do (short of not spatializing sound input) to make things easier for the AEC algorithm? Thanks, Josh > Jean-Marc > > Quoting Greger Burman <greger at mobile-robotics.com>: > >> One thing I can think of is if you are using two or more speakers. If the >> speakers are not at the exact same distance from the mic, you will get more >> than one echo. AEC can not handle that. Try disconnecting all but one...

...diff show differences. I've tried calling rsync with several different options, most notably -c for forcing checksum, but it fails to see a difference between the files. Are there any things I should try or information that I can include? All -vvv gives me is "uptodate". Regards, Greger

...em is that I often get "No such host or network path (136)" from rsync (robocopy or similar works without a glitch) when storing on the SMB share. Is this a common problem, and if so can anyone help me solve it? I'm using rsync/cygwin compiled from cvs (sometime in July). Regards, Greger -------------- next part -------------- HTML attachment scrubbed and removed