Noise "Removal" isn't always possible - Noise "REDUCTION" is! It can removes electronic hums and low frequency rumbles to make your recordings sound cleaner.
CAVEATS:
  • If OVERUSED, "Noise Removal" can make your voice sound artificial and overly compressed like a bad Skype phone call.
  • Irregular background voices and noises like chair squeaks cannot be removed - this filter only works with ongoing hums and white noise

Experiment with the steps below and see if you can improve YOUR recordings
Begin by prepping your file:
  1. When you record, try to leave a second or two of silence - you'll actually record the "Room noise" that has the hums and low level rumbles in your environment.
  2. Use FILE - IMPORT to Load your sound file into Audacity
  3. Use EFFECT- NORMALIZE to Amplify and help optimize the signal

VERSION 2.1.1




Filter Settings
  • Noise Reduction(db): 12
  • Sensitivity: 6.00
  • Frequency smoothing (bands): 0
  • Noise: Reduce (vs Residue)




1. Highlight a sample of "blank" audio - even the quietest part of the waveform is likely to have some "bumps" from background noise
Audacity-Noise-Removal01.png
2. Use EFFECT - NOISE REMOVAL
Audacity-Noise-Removal02.png
3. Click (Step 1) GET NOISE PROFILE to allow audacity to analyze the "quiet" chunk of your waveform
Audacity-Noise-Removal03.png
4. Now highlight the ENTIRE waveform that you want to process
Audacity-Noise-Removal04.png
5. Return to EFFECT - NOISE REMOVAL and if need be, adjust the amount of processing you want to try. A good default mix seems to be
  • 24 Noise Reduction
  • 0.00 Sensitivity
  • 150 Frequency smoothing
  • 0.15 Attack/decay

- Click the PREVIEW button and see how it sounds

When you're happy with it, click REMOVE NOISE to complete the effect!