Adaptive noise reduction first few seconds

[cjacs987654]

Hi

I need to reduce hiss from an audio clip about 20 seconds (all dialogue). I have applied the adaptive noise reduction effect and this works perfectly for most of the clip, except the first 2 or so seconds.

I have read that it needs a short time to 'analysis' the file, but anyone got any ideas how I can get it to work on the entire clip?

Thanks

[SteveG_AudioMasters_ · Accepted solution]

cjacs987654  wrote

I have read that it needs a short time to 'analysis' the file, but anyone got any ideas how I can get it to work on the entire clip?

Yes. Stop using it, and use the (better) process effect. Find a sample of just the hiss, set the FFT to a high value, and process the entire file. I never fail to be amazed at why people continue to use the Adaptive NR - apart from anything else, it produces variable results that can often make after-the-fact editing rather harder to do. You really do get better, more consistent results from the process effect!

And I have to say that for 20 seconds, this is a complete no-brainer - Adaptive NR will hardly have got going...

[cjacs987654]

Hi Steve,

Many thanks for your reply. Perfect result!!

I am new to removing noises and all the googles I did seemed to suggest ANR was the king!

Ideally I would like to do this in premiere but it doesn't seem to be in there. For new work that's no problem, I can apply noise reduction to the files before they get to premiere but I am working on a project I was given 1 hour long. I know I could edit each clip in Audition, but as a lot of the files have the same 'hiss' do you know a way to apply to all clips quicker than editing each one?

Thanks again Steve, great result

Chris

[SteveG_AudioMasters_]

If it really is the same hiss, then you can save the noise profile and reuse it, yes.

[cjacs987654]

Hi Steve

Thanks for that.

When I use the noise reduction tool, there is some slight 'artifacts' or 'worble sound' at low level. I have tried playing around with the various preferences, but no joy. Any idea how to reduce or remove these?

Thanks

Chri

[SteveG_AudioMasters_]

That simply means you've overdone it! Our advice to everybody who experiences this is the same; do 2 or 3 passes, taking a smaller amount of noise out each time - this always works better. The other thing you can do is to vary the FFT size between passes; this varies the 'window' over which the noise is gathered, and for lower frequency noise a larger window (smaller FFT) is often a little better.

[cjacs987654]

Hi Steve

Ok great, will give that a try out

Thanks again for your valuable help

Chris