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I'd like to be able to run my microphone through arbitrary DSP filters--Mostly for compression and amplification, but also noise cancelation would be nice. I'd then like to take that output and put it back in a virtual audio device that I could use as input for skype, mumble, teamspeak, or any other VOIP program.

With a program like Virtual Audio cable, I can do the 'fake devices' part but as far as I know it does not allow any kind of filtering inline.

Does a program like this exist? Or some combination of programs that can be combined to accomplish this?

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The audio subsystem has changed a lot in Vista and Windows 7 so it would help to be more specific as to which version of Windows you are running. – Brian Apr 9 '12 at 17:42
Edited, thanks. – user16315 Apr 9 '12 at 17:43
Not sure if I understood your question. Does it have to be virtual? – wizlog Apr 9 '12 at 17:58
Virtual would be ideal so I could use existing microphones including a USB mic. if there was a reasonably priced hardware solution I'd be interested in knowing about it too though. – user16315 Apr 9 '12 at 18:12

2 Answers 2

You are looking for a mic audio mixer. Windows already have one, but does not support much effects. You can look for a "mic mixer for windows" on google(what I did) and search your own results. My search returned me one good option called "Power Mixer", look it's features:

  • User-friendly, multilingual interface with themes support.
  • Quick volume adjusting by simply rotating the mouse wheel.
  • Supports advanced volume controls such as bass and treble, etc.
  • Unlimited, fully customized user presets for quick volume setup.
  • Quick changing the selected volume controls by using desks.
  • Customizable hot keys for any volume control, preset or desk.
  • Peak level meter for real time audio monitoring.
  • Works with multiple sound cards simultaneously.
  • Vista gadget to control volume from sidebar.
  • Supports changing the speaker configuration.
  • Supports changing default audio device.
  • Fine volume tuning from 0 to 100.
  • Supports Audio Tapers for volume controls.
  • Built-in scheduler with greater facilities.
  • Displays main volume value in the tray icon.
  • On-screen display for perfect volume adjustments.
  • Command-line support for use in a batch file or script.
  • Automatic loading of the program at the system start-up.
  • Can work as service or as an ordinary application.
  • Supports all features of the standard volume control.
  • Works on Windows 95/98/Me/NT4/2000/XP/2003/Vista/7.

And a printscreen:

enter image description here

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That program looks like a nice mixer but it does not look like you can plug in "arbitrary DSP filters" in to it. – Scott Chamberlain Apr 9 '12 at 18:41
It is just one of the google results options, there is a lot of softwares able do that, it is just an example. – Diogo Apr 9 '12 at 18:43

I'm not 100% sure if this would work (and cost may be an issue for your application), but Matlab has modules for taking input from/outputting to an audio device in the DSP System Toolbox.

This would give you virtually limitless filtering options, and you might be able to couple this with a virtual audio device so it passes audio to a virtual microphone instead of outputting to a sound card.

Again, I haven't tried this myself, but thought this information might be helpful to other people reading your question.

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