[wdmaudiodev] Re: How to filter microphone voice?

  • From: Frank Yerrace <Frank.Yerrace@xxxxxxxxxxxxx>
  • To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Fri, 26 Jun 2009 01:29:10 +0000

Note that the only appropriate way to distribute an LFX is as part of a 
complete audio driver package. Of course, if this is just for 
experimentation/proof of concept then do whatever you want.

Frank Yerrace
Microsoft Corporation
This posting is provided "AS IS" with no warranties, and confers no rights.

From: wdmaudiodev-bounce@xxxxxxxxxxxxx 
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Tim Roberts
Sent: Thursday, June 25, 2009 5:42 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: How to filter microphone voice?

kevinrich47 wrote:
Thank you Tim,What I want is not change voice for single app,but for all 
application on the machine,
I have consider Virtual Audio Cable,But the price is not affordable for me.

Oh, come on!  There's a free version with some features limited for you to try 
out, and the full version is only $30.  If you have not done audio drivers 
before, it will save you MONTHS of frustration.

If you are working on Vista, you can write a Local Effects Audio Processing 
Object (LFX APO) to do this.  This is a user-mode DLL that lives in the the 
audio engine process.  There is a sample in the WDK in src\audio\sysfx.  It's a 
little bit tricky to get one installed to begin with, but there are documents 
available to help with that.


Tim Roberts, timr@xxxxxxxxx<mailto:timr@xxxxxxxxx>

Providenza & Boekelheide, Inc.

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