For example, at 2:1, for every 1dB the level drops below the Threshold the expander will reduce it by a further 1dB (totaling 2dB, hence 2:1). Sometimes the Ratio is called Amount, as in Sony Vegas.Ī ratio below 20:1 will act like an expander, with ratios in the 2:1 region making a subtle downward expansion. Noise Reduction Parameters: Recommended Settingsīy controlling this parameter you tell the gate to reduce the volume level by an amount relative to the sounds that are in the audio track. The parameters that you need to adjust to turn a Gate into an Expander depends on the software you use, which we'll cover below. As I said above, expanders create a more natural-sounding noise treatment. Gates and expanders are very similar tools, and most dedicated audio and video processing applications combine the Gate with the Expander. More destructive noise removal tools would be needed here. In this case, an expander could not differentiate between the voice and the noise. Note that an expander isn't effective when the noise level is almost the same as the dialogue level. Expanders are also useful when producing voice overs and ADR. Use an expander when you have subtle background noise from recording on location (such as wind or distant traffic) or background noise from recording in a studio (such as A/C or exterior sounds). Generally speaking, the best noise reduction is always the minimum amount you can get away with. The aim is to reduce the noise until it stops being distracting, without introducing any negative artefacts or distortions to the original sound. Just like in photography and video, the goal with audio noise treatment is not to eliminate noise. In this tutorial you'll learn how to do just that. Instead, you can use an expander to reduce the volume of the noise without completely removing it, which sounds more natural. The tool that most people reach for is a ‘noise gate’, but these can quickly become destructive. As soon as that noise becomes audible, though, it can really distract your audience.Īlthough it's best to remove noise at the source, there are dedicated production tools that can help you to clean up a noisy recording. ![]() Most of the time, a small amount of noise in the background of your video can slip by unnoticed. In reality, however, dealing with environmental noise is a part of virtually every production. We'd all like to have a clean and clear audio in our video recordings.
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