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<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=굴림><SPAN
class=951082817-11082009>Ok, let me be more clear on this.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=굴림><SPAN
class=951082817-11082009></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=굴림><SPAN
class=951082817-11082009>AFAIK, Windows OS doesn't expose speaker input as other
OS ( Linux, Mac OS...). That puts you in bad spot in using Speex AEC with
windows.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=굴림><SPAN
class=951082817-11082009></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=굴림><SPAN
class=951082817-11082009>Only way to work is to use Soundcard with ASIO
functionality which does give you speaker input. But then you would have
to impose that requirement on all your users.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=굴림><SPAN
class=951082817-11082009></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=굴림><SPAN
class=951082817-11082009>I heard Speex AEC works great from developer who
used windows with ASIO Soundcard.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=굴림><SPAN
class=951082817-11082009></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=굴림><SPAN
class=951082817-11082009>Vista AEC DMO or XP DirectSound AEC function does
reasonable job and that's what I am currently using.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=굴림><SPAN
class=951082817-11082009></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=굴림><SPAN
class=951082817-11082009>Tim</SPAN></FONT></DIV><FONT color=#0000ff size=2
face=굴림></FONT><BR>
<DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left>
<HR tabIndex=-1>
<FONT size=2 face=Tahoma><B>From:</B> speex-dev-bounces@xiph.org
[mailto:speex-dev-bounces@xiph.org] <B>On Behalf Of </B>Greger
Burman<BR><B>Sent:</B> Tuesday, August 11, 2009 1:15 AM<BR><B>To:</B>
speex-dev@xiph.org<BR><B>Subject:</B> Re: [Speex-dev] AEC
troubleshooting<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV>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 narrowband mode !? </DIV>
<DIV></DIV>
<DIV>I've been using 100 ms as the default 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.</DIV>
<DIV></DIV>
<DIV>Does DirectSound's AEC perform well with high quality recording? Is it the
general opinion that it performs significantly better than Speex AEC?</DIV>
<DIV></DIV>
<DIV>cheers</DIV>
<DIV>Greger</DIV>
<DIV class=gmail_quote></DIV>
<DIV class=gmail_quote></DIV>
<DIV class=gmail_quote>2009/8/10 Tim Na <SPAN dir=ltr><<A
href="mailto:hna@alu.edu">hna@alu.edu</A>></SPAN><BR>
<BLOCKQUOTE
style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex"
class=gmail_quote>
<DIV>
<DIV dir=ltr align=left><SPAN><FONT color=#0000ff size=2 face=굴림>If you
search the mail archive, you will see that people were only successful using
narrowband with long tail length.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN><FONT color=#0000ff size=2 face=굴림>Unless
you have speaker input in perfect sync with mic input, it is difficult
to use Speex AEC.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN><FONT color=#0000ff size=2 face=굴림>If you
don't have restriction on using Vista's AEC DMO or XP"s DirectSound, I
would recommend using those.</FONT></SPAN></DIV>
<DIV dir=ltr align=left>Â </DIV>
<DIV dir=ltr align=left><SPAN><FONT color=#0000ff size=2
face=굴림>Tim</FONT></SPAN></DIV><BR>
<DIV dir=ltr lang=en-us align=left>
<HR>
<FONT size=2 face=Tahoma><B>From:</B> <A
href="mailto:speex-dev-bounces@xiph.org"
target=_blank>speex-dev-bounces@xiph.org</A> [mailto:<A
href="mailto:speex-dev-bounces@xiph.org"
target=_blank>speex-dev-bounces@xiph.org</A>] <B>On Behalf Of </B>Greger
Burman<BR><B>Sent:</B> Monday, August 10, 2009 5:40 AM<BR><B>To:</B> <A
href="mailto:speex-dev@xiph.org"
target=_blank>speex-dev@xiph.org</A><BR><B>Subject:</B> [Speex-dev] AEC
troubleshooting<BR></FONT><BR></DIV>
<DIV>
<DIV class=h5>
<DIV>I'm experiencing little to no damping of acoustic echo from the echo
cancellor and I can't figure out why so far. I thought I should try the
echo_diagnostic tool so I built libspeex.dll and libspeexdsp.dll with the
DUMP_ECHO_CANCEL_DATA flag, but I'm not getting any output files at runtime.
Any ideas?<BR clear=all></DIV>
<DIV>Build information:</DIV>
<DIV>Speex version: 1.2rc1</DIV>
<DIV>Target Win32 x86</DIV>
<DIV>MS VC++2008 EE</DIV>
<DIV>Configuration: Release, Full optimization, _USE_SSE</DIV>
<DIV>DUMP_ECHO_CANCEL_DATA </DIV><BR>-- <BR>Greger
Burman<BR><BR></DIV></DIV></DIV></BLOCKQUOTE></DIV><BR></BODY></HTML>