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<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hi again. I’ve tried turning off one of the speakers,
played with polarity of the speakers – no effect. <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I cannot say that echo is not removed at all – I
definitely hear the distortion of the echo but it still remains as an
unpleasant <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>“robo-voice” in the background. <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Is the speakers’ volume level crucial for speex AEC, or it
can successfully adapt? I just can’t understand why does it happening?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Attempts to use testecho.exe on not-working dumps were
unsuccessful even when I played with the signal delay values (it’s not
more than 10-20 ms, sometimes even less), volume levels…<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I will appreciate if somebody tries to check my dumps, that are
still here:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><a
href="http://rapidshare.com/files/317389207/speex_AEC_test.rar.html"
target="_blank">http://rapidshare.com/files/317389207/speex_AEC_test.rar.html</a><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Thanks, Anton.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> speex-dev-bounces@xiph.org
[mailto:speex-dev-bounces@xiph.org] <b>On Behalf Of </b>Greger Burman<br>
<b>Sent:</b> Monday, March 15, 2010 6:16 PM<br>
<b>To:</b> speex-dev@xiph.org<br>
<b>Subject:</b> Re: [Speex-dev] AEC strangest behavior<o:p></o:p></span></p>
</div>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-US>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 see if it makes
any difference.<br>
<br>
cheers<br>
Greger<o:p></o:p></span></p>
<div>
<p class=MsoNormal><span lang=EN-US>2010/3/15 Anton A. Shpakovsky <</span><a
href="mailto:saa@tomsksoft.com"><span lang=EN-US>saa@tomsksoft.com</span></a><span
lang=EN-US>><o:p></o:p></span></p>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>Hello.<o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>I have the following situation. AEC is used in network chat software
<o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>over DirectSound API. Echo and reference signals are almost aligned <o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>(delay is no more than 30ms). When echo is emulated in notebook <o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>(built-in speakers + mic) everything goes fine and echo is
cancelled. <o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>But when configuration includes stand-alone speakers and mic no echo
is <o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>removed. Audio is in 22050 hz at 16 bit mono format, number of
samples <o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>to process were 441 and tail was used 4096.<o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US> <o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>Dumps are here: <a
href="http://rapidshare.com/files/317389207/speex_AEC_test.rar.html"
target="_blank">http://rapidshare.com/files/317389207/speex_AEC_test.rar.html</a><o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>nb_*** - working configuration (notebook)<o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>sa_*** - standalone speakers with no echo removed<o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US> <o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>Can it be because of differences in fixed and arbitrary acoustic
systems?<o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>I will appreciate any of your advises or thoughts.<o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US> <o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>Thanks!<o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US> <o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>Anton A. Shpakovsky<o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>Multimedia Software Developer<o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US> <o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><span lang=EN-US><br>
_______________________________________________<br>
Speex-dev mailing list<br>
</span><a href="mailto:Speex-dev@xiph.org"><span lang=EN-US>Speex-dev@xiph.org</span></a><span
lang=EN-US><br>
</span><a href="http://lists.xiph.org/mailman/listinfo/speex-dev"
target="_blank"><span lang=EN-US>http://lists.xiph.org/mailman/listinfo/speex-dev</span></a><span
lang=EN-US><o:p></o:p></span></p>
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<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
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