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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Here’s the graph of the echo coefficients I
grabbed from <span class=GramE>a</span> x100p card on my asterisk server. If my
interpretation is correct, it shows that most of the echo comes in at about the
28<sup>th</sup> tap, and assuming a sample rate of <span class=GramE>8000hz</span>,
that would be about 3.5ms.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Will that tell you the sort of things you
need to know?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>james<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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EN-US'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;mso-ansi-language:EN-US;font-weight:
bold'>From:</span></font></b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;mso-ansi-language:EN-US'> asterisk-users-bounces@lists.digium.com
[mailto:asterisk-users-bounces@lists.digium.com] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Eric Bishop<br>
<b><span style='font-weight:bold'>Sent:</span></b> Sunday, 15 January 2006
11:06<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">Asterisk
Users Mailing List - Non-Commercial Discussion</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Asterisk-Users] echo
tail stats</span></font><span lang=EN-US style='mso-ansi-language:EN-US'><o:p></o:p></span></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Yes, plese do post it....<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><span class=gmailquote><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>On 1/15/06, <b><span style='font-weight:bold'>James
Harper</span></b> <<a href="mailto:james.harper@bendigoit.com.au">james.harper@bendigoit.com.au</a>>
wrote:</span></font></span> <o:p></o:p></p>
<div>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>I'm working on some code to be able to preload the echo
cancellers (and obviously dump the data too, which I've already done). I should
have a patch ready tonight or tomorrow.</span></font><o:p></o:p></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'> </span></font><o:p></o:p></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>If you are interested I can attach a plot of the coefficients
against time which might tell you the sort of thing you need to know if you
could do it on your data. The image is only an 11k gif… would it be okay to
post it to the list?</span></font><o:p></o:p></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'> </span></font><o:p></o:p></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>James</span></font><o:p></o:p></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'> </span></font><o:p></o:p></p>
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face="Times New Roman"><span lang=EN-US style='font-size:12.0pt;mso-ansi-language:
EN-US'>
<hr size=2 width="100%" align=center>
</span></font></div>
<p><b><font size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;
font-family:Tahoma;mso-ansi-language:EN-US;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma;
mso-ansi-language:EN-US'> <a
href="mailto:asterisk-users-bounces@lists.digium.com" target="_blank">asterisk-users-bounces@lists.digium.com</a>
[mailto:<a href="mailto:asterisk-users-bounces@lists.digium.com" target="_blank">asterisk-users-bounces@lists.digium.com</a>]
<b><span style='font-weight:bold'>On Behalf Of </span></b>Eric Bishop<br>
<b><span style='font-weight:bold'>Sent:</span></b> Sunday, 15 January 2006
10:11<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">Asterisk
Users Mailing List - Non-Commercial Discussion</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> [Asterisk-Users] echo
tail stats</span></font><o:p></o:p></p>
</div>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>Does
anyone know how to determine the echo tail size (in ms) of a particular call?<o:p></o:p></span></font></p>
</div>
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face="Times New Roman"><span style='font-size:12.0pt'><br>
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