Removing High Frequency Noise

[HuckFinn89]

At the top of the spectral display around 9k there is a noise/frequency(?) How do I isolate and get rid of that. The low level noise shown here I am able to remove through capture noise print then noise reduction. But I don't know how to get rid of the higher noise. When I run the noise reduction process, it only remains while my guest is speaking.

[SteveG_AudioMasters_]

One thing you could try, if you haven't already, is to set the NR FFT size to its highest value (16384), and using the marquee tool, selecting just the area around 9kHz in the quiet section as a noise profile. You may have to adjust the Noise Reduction (really the threshold value) so that it's only just below the top trace. Then adjust the other slider so that it's not taking out too much noise in one go (3-4dB). And then repeat the process.

If this isn't effective, then use the notch filter, although you might need to experiment with the settings quite a bit to get a good result. As a more visual alternative, you can use the marquee tool again to select just the line, and then use the HUD to reduce the level of it - this gives a very clear indication of how much to remove.

If none of that works effectively, then report back.

[MikeHarrison]

If you don't mind my butting in and saying so, Huck, it looks as though you've also got something fairly steady going on just above 1k, something at roughly 700 Hz that is not quite as loud, and also somewhere around 100 Hz. It would seem, based on the intensity of the color in the spectral display, that they would be audible.

[SteveG_AudioMasters_]

I get the impression that he realises that, judging from what he's said about the low level noise...

[MikeHarrison]

Ah. I didn't get that what he meant by "low level noise" was the lower frequency stuff. However, the 1k+, 700 Hz and, perhaps to a somewhat lesser degree, 100 Hz are prominent in the voice, so I'm trying to imagine how he'll filter whatever those steady noises are without also adversely affecting the voice.

[SteveG_AudioMasters_]

I think he means lower down the screen... 😉 - but it certainly is quieter as well.