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How to Remove Low-end Noise from Sound Effects for Video

by: SFXsource
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Since commercial and corporate video production budgets can often be small and executed under a short time frame, the recorded sound may suffer. During post-production, as a result, producers may encounter some terrible audio problems. One common dilemma is a low-end noise or hum that permeates dialog and other ambiance recordings.

Software plugins that remove noise from audio abound and some function very well. However, under a fast approaching deadline, one may not have the time to find, purchase, and learn the nuances of a new plugin. For these situations, simply turn to the default equalization and reverbs provided in your audio or video editing software.

Use standard package plugins and the following tips to eradicate nasty noise from the bottom end of your audio recordings:

First, use a Single Band EQ to try and cut out the offensive hum. This type of EQ will cut out all sound below or above a certain frequency. For example, since low rumbles generally occur around 60 Hz, you can use a Single Band EQ to cut out everything below 80 Hz which will remove the hum without adversely affecting the dialog.

Secondly, a Parametric EQ can be used to "notch out" the unwanted noise by decreasing a thin width of audio frequencies and its octaves such as 60 Hz, 120 Hz, and 240 Hz. The advantage of using a Parametric EQ is that one can notch out the offensive noise without hurting wanted audio.

Secondly, you can boost the desired audio also by using a Parametric EQ. This will give the wanted audio prominence over the unwanted audio. Once can boost the dialog at 5 hz slightly, for example, to give it prominence over a low rumble.

Fourth, after cutting out the lower end, a bit of reverb can be used on the mix. Such an effect can wash over and warm up a "tin can" feel that might come from taking out the bottom end.

While the above tips are very basic and will not by any means eliminate the problems of poorly recorded audio, they will definitely improve the sound of a poor recording when the dialog and hum are vying for the listener's ear.

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