For a recording to have good audio quality, it needs to have as little background noise as possible. Background noise is any constant sound which was not intentionally added to an audio recording. The lesser the background noise a listener can hear, the better the quality of an audio recording. This is why noise reduction is a very important part of the finishing process for audio recordings.
Noise reduction is the process of getting rid of any constant background noises or interfering sounds that muddy the clarity of your audio recording or distract from its substance. With noise reduction, you can get rid of constant background sounds like the hum of a machine, the buzz of a fan, whistles, whines, and hisses.
The good news is that with software like Audacity and FilmoraPro, amateurs and professionals can easily do noise reduction in a few simple steps. In this post, we show you how to easily do noise reduction in Audacity and FilmoraPro.
Audacity is a lightweight opensource audio recording and editing software that’s used by many serious podcasters and vloggers. It has PC and MAC versions, and it can be downloaded with an easy-to-read manual. Before you begin the noise reduction process, assess your audio recording, taking note of parts that have background noise and the different background sounds in the recording. You should also form the habit of taking a separate recording of the ROOM TONE. You can know more infomation of Audacity from PCmag review. This recording will provide a clear sample of the background noise in the room and will be very useful in the noise reduction process. See steps below:
The first step is to create a NOISE PROFILE. This profile tells Audacity the nature of the noise to be reduced or eliminated from the audio recording. To create a NOISE PROFILE, open your ROOM TONE recording and click on EFFECT > NOISE REDUCTION.
If you didn’t make a ROOM TONE recording, then open the audio file you want to process. Once opened, click and drag over a section that contains mostly noise to select it. Then, click on EFFECT > NOISE REDUCTION.
Once a new window labelled ‘STEP 1’ opens, click on the ‘GET NOISE PROFILE’ button. This creates the NOISE PROFILE which Audacity will use in the noise reduction process.
Next, select the entire audio file that requires noise reduction. Then, select NOISE REDUCTION from the EFFECTS tab on the top menu bar.
When the new window labelled ‘STEP 2’ opens, take your time to enter the settings that give you the desired level of noise reduction. Carefully adjust the bands for NOISE REDUCTION, SENSITIVITY and FREQUENCY SMOOTHING.
Now, click the PREVIEW button to hear the effect of your noise reduction settings. If you are not satisfied with the preview, you can adjust the settings bars until you achieve a good result.
You should also click on the RESIDUE radio button to hear the sounds that will be eliminated from your recording if your chosen settings are applied. This can be very useful as some settings can result in the loss of valuable audio content. If you hear valuable audio content captured in the residue, adjust your settings accordingly. Try as much as possible to minimize the loss of valuable audio content.
Once you are satisfied with your audio preview and residue, click the OK button with the REDUCE radio button selected. This will perform the noise reduction effect on your audio recording.
Noise reduction in FilmoraPro is very fast and simple. Everything happens in real time as you move through the steps listed below. All effects and changes are saved when the audio or video file is saved at the end of the editing process.
Like Audacity, FilmoraPro needs to sample the noise to be removed from an audio or multimedia recording. This sample is called a NOISE PRINT. A recording of ROOM TONE can be used to create a NOISE PRINT. Alternatively, a suitable section of the main recording will serve. See noise reduction steps below:
Simply open the main audio file to be edited and select the section which contains the target background noise by placing the playhead in the right place. Then, click on CAPTURE NOISE PRINT under the NOISE REDUCTION effect menu.
If you’re working with a video file, be sure to unlink the Audio from the video. Once audio is unlinked, Go to effects and type into "noise reduction". Then drag it onto auido clip. Create a NOISE PRINT. After the noise reduction process, the audio and video files can be merged into a single multimedia file.
Once FilmoraPro has captured the NOISE PRINT, more options will appear. ADD TO NOISE PRINT is an important option. It lets you identify other noises to be removed from your audio file and add them to your NOISE PRINT. This means that with FilmoraPro, you may only need to apply the noise reduction effect once.
Adjust the other settings on this page such as THRESHOLD and REDUCE BY values. The THRESHOLD setting in FilmoraPro works like the SENSITIVITY setting in Audacity. They both let you choose the strength of the noise removal effect. At the higher end of these settings, valuable audio content may be lost. At the lower end however, portions of the background noise may remain or be distorted into audible artifacts.
The REDUCE BY setting in FilmoraPro works like the NOISE REDUCTION setting in Audacity. They both set the volume or decibel reduction that will be applied to reduce or remove the noise from the recording.
Ensure no valuable audio is lost during noise reduction by listening audio track before it is saved at the end of the editing process.
Keep in mind that noise reduction is not a perfect process and strong noise reduction settings can result in the loss of valuable audio content. Whether you choose to use Audacity or FilmoraPro, try to strike the right balance between getting rid of background sounds and retaining valuable audio content.
Liza Brown is a writer and a lover of all things video.
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