Audacity will use this to learn about the noise and create a noise profile. The most important part of the noise reduction process is ensuring you have a good sample of the noise you want to remove. Remove background noise in Audacity Preparation for noise reduction
Noise Removal Software – Audacity Download. Noise reduction in audacity step-by-step. That’s the basic process for noise removal in Audacity but I’ll now go through the process step by step. Use trial and error to find the best amount of Noise Reduction to apply. Select the section of audio to be filtered. Use the Noise Reduction effect to sample the noise and generate a Noise Profile. Select a few seconds of the background noise from the audio waveform. Ensure your recording includes a section with just the background noise. To remove the background noise, you will need to do the following. If you already have audio software it may include a noise reduction or noise removal effect, if so, you can follow along since the noise reduction process will be similar. Audacity allows you to remove static, hiss, hum, and other constant background noises from your audio recordings. I mean those constant background sounds like a fan, air-conditioning unit, refrigerator, or computer fan. I don’t mean background noise like recording under the flight path of a busy airport or on a construction site. 
It’s always better to record a voiceover for your video without background noise, but sometimes it’s unavoidable.
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