How to remove noise from audio using Audacity

Audacity is an open source audio editor, very powerful and free, available in Mac and other major platforms. I use it to record my short audio program.

No matter what microphone you use, no matter how quiet your room is, your audio always includes some background noise.

Screenshot 2015-03-31 09.22.04

Like this audio above, the selection should be blank, but you can see some wave, because my microphone, and my fan etc. Audiences will hear it loud and clear, and nobody will like it.

But we can use Noise Removal Effect built in Audacity to fix it.

First step, select some background noise like the picture above. Then click menu Effect -> Noise Removal, this dialog box will appear.

Screenshot 2015-03-31 09.29.59

Click the Get Noise Profile button, the dialog box will disappear.

Then select the whole audio or what segment you need, and click menu Effect -> Noise Removal again, then click Ok button, and then everything is done.

Screenshot 2015-03-31 09.35.26

Now you can see the same section as the first picture, but these is a very clear line now.