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I have a recording from a camcorder (with a broken mic) where the audio is 1) largely white noise and 2) almost in-audible sound from people chatting in a room.

What methods could be used to amplify the "almost in-audible" parts (and remove the white noise)?

I guess what consumer level audio tools could do this?

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up vote 4 down vote accepted

From your description of the audio, it is going to be hard to fix, as white noise tends to cover a very broad frequency spectrum and so is hard to get rid of without losing what you want to keep. A decent starting point for you would be to use a freeware audio editing program like Audacity. Here is a noise removal tutorial using Audacity.

You can also use audacity to cut out sections where there is no background talking. Then you can use an effect called a compressor to attempt to raise the level of the speaking to a better level, although you may still find you are amplifying some background noise. Here's a description of the audacity compressor.

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thanks, I'll give those a shot. – MikeM Apr 26 '11 at 18:44

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