[AG-TECH] interesting slashdot .. software echo cancellation

Jay Beavers jbeavers at microsoft.com
Fri May 10 09:58:07 CDT 2002

Yes, no.

The audio processor routines are DirectX Media Objects.  DirectShow
wrapper filters exist for them, but I was unable to find any
documentation on properly using their interfaces.  Attempting to use
them by inserting them into a DirectShow graphic and playing results in
a blank audio stream.

Since these routines are limited to one microphone & optimized for a 10'
x 10' room, I haven't pursued it any further than this.

 - jcb

-----Original Message-----
From: Jon Zeeff [mailto:jzeeff at internet2.edu] 
Sent: Thursday, May 09, 2002 9:58 AM
To: Jay Beavers; Asher Yanich; ag-tech at accessgrid.org
Subject: RE: [AG-TECH] interesting slashdot .. software echo

It is accessible by other software?  Ie, can these routines built-in to
XP be called from applications other than Messenger?  Are they well

>Actually, software echo cancellation, automatic gain control, and noise

>reduction is already in Windows XP and used in the Windows Messenger 
>conferencing app.

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