Premiere Pro Tutorial Part 48: Adaptive Noise Reduction, Pt 3

Adobe Premiere ProBy Andrew Devis (doodleNEWS)

I conclude my Premiere Pro tutorial on Adaptive Noise Reduction with the final three controls. Here is part 1 and part 2.

Last Three Controls

Last Three Controls

Last Three Controls

Spectral Decay Rate is an important slider in Premiere Pro, as it can have a dramatic effect on your audio. If you get this wrong, you can produce either a pulsating effect or a reverb effect.

What this slider is doing is determining when to cut the audio by 60dB when the good signal stops. So, when you stop talking and there is a pause, you want the noise to also stop. However, if you do this too quickly, it can create a pulsing or pumping effect, while if you do it too slowly, it can create a reverb-like effect. Both are generally undesirable.

Broadband Preservation is about preserving good audio that is around desirable signal levels. So if your audio is speech, you may want to preserve audio spectrum around the speech so that it sounds natural, because speech is made up of a range of frequencies. So, a broadband of frequencies are preserved around (above and below) good signal levels. The typical setting is 100Hz, which means that for 100Hz above and 100Hz below the good audio – no noise reduction is applied. You can obviously change this setting in Premiere Pro to increase the range or decrease the range. If you increase this, the chances are you will get more noise, and if you decrease, you may make the audio sound less natural.

Lastly, FFT size — think of this as a quality switch. The higher the number the more frequency bands are analysed. Lower settings are good for getting rid of pops and clicks, while higher settings are good for dealing with longer slower noise problems. My advice is again to play with these settings, and try and use the lowest setting that works to avoid over-processing your audio and slowing your machine down!

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