<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:st1="urn:schemas-microsoft-com:office:smarttags" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii">
<meta name=Generator content="Microsoft Word 11 (filtered medium)">
<o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags"
name="country-region"/>
<o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags"
name="place"/>
<!--[if !mso]>
<style>
st1\:*{behavior:url(#default#ieooui) }
</style>
<![endif]-->
<style>
<!--
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman";}
a:link, span.MsoHyperlink
{color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{color:purple;
text-decoration:underline;}
p.MsoPlainText, li.MsoPlainText, div.MsoPlainText
{margin:0cm;
margin-bottom:.0001pt;
font-size:10.0pt;
font-family:"Courier New";}
p
{mso-margin-top-alt:auto;
margin-right:0cm;
mso-margin-bottom-alt:auto;
margin-left:0cm;
font-size:12.0pt;
font-family:"Times New Roman";}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:Arial;
color:windowtext;}
@page Section1
{size:612.0pt 792.0pt;
margin:72.0pt 90.0pt 72.0pt 90.0pt;}
div.Section1
{page:Section1;}
-->
</style>
</head>
<body lang=EN-US link=blue vlink=purple>
<div class=Section1>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> We are having problems with echo cancel in 1.1.11 that we
didn’t have with 1.1.10. Doing sound tests (just saying “check,
test” for about 30 seconds), we hear electronic noise and at some point
the algorithm goes wild and the residue samples returned by the echo cancel become
so big they become bigger than the floating point range (all values in the
residue buffer are “nan” or “not a number”). Then we
have to reset the echo cancel otherwise everything hangs (i.e. the preprocess becomes
really slow trying to handle “nan” and the echo cancel never comes
back on its own). I can make it consistently crash with 1.1.11 but I cannot
reproduce it with 1.1.10. Any idea of what could cause this?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Regards.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p style='margin:0cm;margin-bottom:.0001pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>"Intellectuals solve
problems,</span></font><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p></o:p></span></font></p>
<p style='margin:0cm;margin-bottom:.0001pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>geniuses prevent
them.", Einstein</span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>
<p style='margin:0cm;margin-bottom:.0001pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>-----------------------------------------</span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>
<p style='margin:0cm;margin-bottom:.0001pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>Martin Lamothe
<Martin.Lamothe@sess.ca></span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>
<p style='margin:0cm;margin-bottom:.0001pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>SESS <u1:country-region u2:st="on"><u1:place u2:st="on"><st1:country-region
w:st="on"><st1:place w:st="on">Canada</u1:place></u1:country-region></st1:place></st1:country-region>
(450)653-9669</span></font><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p></o:p></span></font></p>
<p style='margin:0cm;margin-bottom:.0001pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>-----------------------------------------</span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
</body>
</html>