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EP 35: Noise Reduction

By - Jun 17, 2022 10:58 AM

In this tutorial, we’ll learn how to reduce the background noise in our audio. We’ll learn how to add the Noise Reduction effect and how to adjust it.

If we want a recorded voiceover, we should do it in a quiet room with excellent acoustics. But of course, that’s not always possible even in a quiet room. We can find background noise in the audio after recording. Not to mention if we’re vlogging in a noisy place. Luckily, in FilmoraPro, we have a fantastic tool to reduce the audio noise in post.

The Noise Reduction effect is a feature that takes a section of the audio that we select to identify it as unwanted noise. Then it will analyze the entire audio clip searching for similar patterns of the audio to reduce its volume. This is not the best situation to record audio because there is a fan turned on, and the other guy is eating something.

We’ll import this audio file and add the noise reduction effect to it. Now, we need to find a section of the audio where only the unwanted noise is audible.

add noise reduction effect

We’ll check the waveform, so it’s easier to find where the person stops talking for a moment.

Use of Logarithmic Waveform Scaling

If we’re having a hard time seeing the waveform in the timeline, we can go to File > Options > General and check the Use Logarithmic Waveform Scaling.

make waveform visible

So now the waveform will be more visible. The audio section mentioned in the video specifies where the voice is not audible, but the background is.  So, we’ll place the playhead in the center of the area to select it. And we’ll press the Capture Noise Print button in the Controls Panel. Immediately some more options will drop down in effect. If we play the audio now, we can see how the background noise is significantly reduced.

check audio

Listen to the audio and see the difference. In most cases, the noise reduction will be okay immediately. But we can also adjust the effect. The threshold illustrates the percentage of the noise detected that is going to be reduced. And “Reduce By” is the amount of reduction that is going to be applied to the selected percentage of the threshold.

noise reduction effect

It’s usually necessary to reduce louder noises, but if we’re using a hard noise reduction, this can distort the voice that we want to maintain, making it sound robotic.

Final Touch To Reduce Background Noises

Sometimes, it’s better to retain a small amount of audible noise to keep a natural voice tone. If we have more than one noise that we want to eliminate, we can add several Noise Prints. For example, there was someone eating chips in the background, and we can hear the noises of the bag and the fan.

We’ll search for a section of the timeline where I can hear that sound but not the voice. And click on the Add to Noise Print option.

add noise reduction effect

Finally, we’ll again listen to the audio to check if the voice still feels natural, and the voice is gone. If we are not convinced the audio sounds the best, we’ll adjust the threshold and Reduce By values once more.

adjust sound for natural tone

Now, we can compare the audio with and without the effect. Play the audio and once you are satisfied with the results, save the file.

original and edited audio

That’s how to reduce background noise in FilmoraPro. To learn more about editing in FilmoraPro, check out the other tutorials in the series.