[wdmaudiodev] Re: AEC in Vista

  • From: Hakon Strande <hakons@xxxxxxxxxxxxxxxxxxxxx>
  • To: <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Wed, 4 Oct 2006 12:23:54 -0700



(I am not answering for Shuba but she is on vacation so you get my views


Another viewpoint could be that AEC should really not be a vendor
provided feature or an attribute of the microphone or any other capture
hardware but should rather be inherently built into OS APIs because it
is so necessary for some applications to function and because
applications don't want to rely on the user having a certain
driver/filter driver/APO installed or specific capture hardware


Enabling applications (who one could argue owns the total user
experience for that application and should be able to control it) to
make use of a universally known and always present/available AEC may be
a better solution than inserting 3rd party processing into the pipeline
that the application may not even be aware of, the application may not
be able to control or that may not be there on all systems.


Please email us directly if you want to continue a philosophical
discussion about the different approaches to value-add enabling in
Windows Vista. 





Hakon Strande (hakons@xxxxxxxxxxxxx)

Program Manager Integrated, Internal, External, and Wireless Audio

MediaTech/DMD/Windows Client/Microsoft


From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Tim Roberts
Sent: Wednesday, October 04, 2006 10:20 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: AEC in Vista


Shuba Iyer wrote: 


AEC and microphone array processing in Vista are application graph
features. So it is up to the application to use the feature or not.

You know, the more I think about this statement, the more I think this
position is completely wrong.

AEC is perhaps "the" canonical feature that one would want to use
globally.  As a user, I'm not going to think about AEC as an application
add-on.  Instead, I'm going to think about AEC as an attribute of the
microphone array.  If I have installed some kind of AEC, then I want
echo cancellation in every application that uses that microphone,
whether it be wave, DSound, or WASAPI.

I've been using Sound Recorder as an example, but that's the wrong
example.  With the policy you have described, there is no way to use an
AEC-enabled microphone with NetMeeting, which is one of the apps where I
would most want echo cancellation.  In fact, if I am a vendor supplying
my own AEC DMO following your model, there is no way to have it get used
by any applications other than the ones I have written myself.

That ain't right.  Have I misunderstood your position?

Tim Roberts, timr@xxxxxxxxx
Providenza & Boekelheide, Inc.

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