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Audacity: Computer Noise Removal

Thursday 08 March 2007 at 09:02 am Very often one needs to record something using a microphone while sitting in front of the computer what usually produces some level of unwanted noise (from CPU or power fans and HDD spinning) which is to be heard later in the background on the recorded material so I've played with Audacity (used 1.3.0-beta – yeah, I know it's a bit older version) effects a bit and came out with this solution:

1. Select whole track and from the menu choose Effect → Plugins 1 to 6 → High Pass Filter… . You can leave the default value of Cutoff frequency on 1009 Hz and confirm.
2. Next step is Effect → Normalize… . Keep default values again.
3. Now select only some part of your record where only the computer noise is to be heard (a pause in your talk) and apply the Step 1 of Effect → Noise Removal — Get Noise Profile.
4. Make the whole track selection again and apply the Step 2 of the same effect moving the slider completely to the left "None" value. Then use your keyboard's right arrow and move it one or two steps to the right (you can experiment with this using Preview because it depends on the amount of the background noise)

That's it ! Optionally you can amplify your record using Effect → Amplify… (default values and check on the Allow clipping checkbox) or bring some basses back using Effect → BassBoost… (good values are 100 Hz and 4 dB).

Used tags: audacity, audio, howto, linux, noise_removal, open_source
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