How to Remove Low-end Noise from Sound Effects for Video
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 these procedures in tandem with your default plugins to help rid your audio recording of unnecessary and distracting noise:
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.
Next, a Parametric EQ can also be used to boost the wanted audio. Boosting the desired frequencies will give them prominence over the unwanted noise and thus redirect the listener's attention from the noise. For instance, put a small hump in around 5 Khz will amp the human voice over a lower rumble.
Finally, one can use reverb on the entire mix once the lower rumble has been cut out. This can reduce the "tin can" effect that might result from minimizing the lower end.
Following the above strategies may not completely erase all problems associated with bad audio, but they can improve the quality of the product when unwanted noise and dialog are competing for attention in the mix.
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 these procedures in tandem with your default plugins to help rid your audio recording of unnecessary and distracting noise:
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.
Next, a Parametric EQ can also be used to boost the wanted audio. Boosting the desired frequencies will give them prominence over the unwanted noise and thus redirect the listener's attention from the noise. For instance, put a small hump in around 5 Khz will amp the human voice over a lower rumble.
Finally, one can use reverb on the entire mix once the lower rumble has been cut out. This can reduce the "tin can" effect that might result from minimizing the lower end.
Following the above strategies may not completely erase all problems associated with bad audio, but they can improve the quality of the product when unwanted noise and dialog are competing for attention in the mix.
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posted by Marcondes Allen at 3:49 AM
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