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Removing Leakage and Ambience using Expander
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Removing Leakage and Ambience using Expander
The expander can be used as both a problem solver (to reduce ambient background noise or increase isolation) or as a creative tool (altering the ADSR envelope of a sound). In this article, you will use the expander to get rid of leakage of one sound from another. Then you will use the expander to "tighten" up a sound that has too much ambient reverb.
Listen to the signal There is a lot of unwanted noise from leakage from the headphones the vocalists are wearing and also from talking and moving around. The level of noise is lower than that of the vocalists when they sing. When they sing, the voices would most likely mask the noises, but there is a lot of open space in which can be heard the noise. The problem with this is if you want to process the vocalists, you would also be processing the noise as well. You want to remove the undesirable noise before processing the desired signal.
Remove the leakage from the vocalists' signal using the Threshold control You use the expander to remove the background noises and headphones leakage by setting the threshold level so it is below the vocal but above the noise. When set correctly, the expander will allow the vocalists to pass through while attenuating the leakage by the amount you selected.
To do this, adjust 'Threshold' control setting that will allow the entire vocal group's envelope to pass through the expander.
Modify the "Reverb Tail" of the vocalists using the Release Time control Notice that the trailing decay of the vocalist's room tone seems clipped off. This is because the release time is set to its fastest and is probably too fast for this sound. Lengthening the release time will allow a more natural end to the sound of the singers.
To do this, increase the 'Release' control to make the voices' decay sound more natural. Be careful, if you go too far, you will begin to hear the leakage before the expander has time to fully attenuate it.
Set the expander parameters to the following conditions:
Listen to the signal Assume that you hear a snare drum that has a great deal of reverb on it. The reverb time was set too long and we want to shorten it.
"Tighten up" the snare drum signal using the Threshold control You can use the expander to get rid of the long reverb overhang by setting the threshold level so it is below the snare hit but above the level of the reverb. When set correctly, the expander will allow the snare hit to pass through, while attenuating the reverberation tail by an amount you select.
To do this, adjust the 'Threshold' control setting that will allow the entire snare envelope to pass through the expander (with the reverb tail).
Modify the "Reverb Tail" of the snare by using the Release Time control You will notice that the trailing decay of the snare reverb seems to be too clipped-off. This is because the release time is set to its fastest and is probably too fast for this sound. Lengthening the release time will allow a more natural end to the sound of the snare reverb.
To do this, increase the 'Release' control to make the snare reverberation decay sound more natural. You may not be able to achieve a pleasing reverb tail with only the release time control. Go on to the next step.
Modify the "Reverb Tail" of the snare by using the Ratio control Even after adjusting the release time you may find that the trail off of the reverb doesn't seem natural. What is happening is that the ratio of the attenuation is set too high. The attenuation is simply happening too quickly. Slowing down the rate of the attenuation will help this problem.
To do this, adjust the 'Ratio' control so that you achieve a natural sounding trail off of the reverb.
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