This week I recorded a video interview at my client's office.
The chosen meeting room was isolated from the office noise except for the Aircon blower inside.
I could lower the fan speed but cannot totally turn it off.
What's left is to reduce the noise during editing.
Here's how I did it with Adobe Premiere Pro and Audition...
- Drop the raw video footage onto the timeline in Premiere Pro.
- Change both audio channels to the right (because the wireless mic is connected to the right channel audio input, while the left is the on-camera mic as backup)
- Right-click on the audio of the video clip.
- Select Edit Clip in Adobe Audition. Adobe Audition will open.
- Inside Adobe Audition, select a range of the clip where there is no other sound except the aircon noise.
- Select the whole audio clip.
- Go to main menu and select Effects > Noise Reduction / Restoration > Noise Reduction (process).
- Noise Reduction at 100% results in unnatural sounding voice and some gurgling background noise. Somewhere between 70% to 90% works best for me. Thats why they call it noise REDUCTION and not noise REMOVAL.
- At the same time, tweak the Reduce by level till you get the best combination. 10db to 20db worked for me.
- Under the Advanced section, you can improve the quality further by tweaking the Spectral Decay Rate (20% to 30%), Smoothing and Transition Width.
- Click Apply when done tweaking. The whole audio clip will be processed.
- Select default and click Apply.
- From the main menu, select File > Save.
- Go back to Adobe Premiere Pro and and the audio for the video clip will be changed automatically.
We can continue to edit as per normal. I like to remove the background noise from the whole raw footage before editing, in order to maintain consistency.