[wdmaudiodev] Re: How to filter microphone voice?

  • From: "kevinrich47" <kevinrich47@xxxxxxxxx>
  • To: <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Fri, 26 Jun 2009 10:04:42 +0800

Hi,Could you please tell me which technology in Microsoft is the best choice to 
implement a voice changer?Thank you .

  ----- Original Message ----- 
  From: Frank Yerrace 
  To: wdmaudiodev@xxxxxxxxxxxxx 
  Sent: Friday, June 26, 2009 9:29 AM
  Subject: [wdmaudiodev] Re: How to filter microphone voice?

  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@xxxxxxxxxxxxxxxxxxx & Boekelheide, Inc.

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