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PG_93
PG_93
Participant
July 25, 2017
Question

Noise Reduction Destruction

  • July 25, 2017
  • 1 reply
  • 5988 views

Hi Adobe Community,

I am currently working on an audio strip that contains an interview of a friend for a video that I first worked on in Premiere Pro -- I merely wanted to reduce the background noise within the clip so I exported and imported the clip into Adobe Audition. This is my first time using Audition so I was following some tutorials and it had me take the 'noise print' of the background noise I wanted to eliminate and although it did minimize a majority of the noise in the background it seemed to greatly affect the main audio foundation of the interview. Then my friend's voice became very gurgily and some what metallic.The tutorial did advise me that this would happen since noise reduction process is a very finicky and powerful tool. Later the tutorial had me use 'adaptive noise reduction' to take care of this gurgily and metallic sound. However, this only took care of some more background noise and hardly touched the distorted sound that was affected after reducing the noise.

I had the noise reduction bar setting in 'noise reduction process' around 80dB and the 'reduce by' setting at 30. My advance settings were:

- Spectral decay rate: 10%

- Precision Factor: 15

- Smoothing: 900

- Transition Width: 15 dB

I didn't think that was too bad and I recorded everything on a rode mic. I have fiddled with these settings all I can, having some up and some down and nothing seems to get rid of this metallic gurgily effect. Honestly, I have followed many tutorials about this issue but I can't seem to find one that can directly pinpoint that gurgily after effect once the noise reduction is applied. Any help to solve this issue would be greatly appreciated! Thanks everyone!

Here are the links to some of the tutorials I followed:

Advanced Noise Reduction in Audition - YouTube

Removing Background Noise From Audio With Adobe Audition CC - YouTube

How To Make Your Voice Sound Better (Secrets Revealed) - YouTube

HOW TO MAKE YOUR VOICE SOUND PERFECT FOR VIDEO | AUDITION CC TUTORIAL - YouTube

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      1 reply

      ryclark
      ryclark
      Participating Frequently
      July 25, 2017

      The artefacts that you are hearing are due to trying to remove too much noise all at once. The general advice is to do several passes at no more than about, at the most, 10db of noise reduction. Increase the FFT size at each pass and take a new noise sample for each.

        PG_93
        PG_93Author
        Participant
        July 26, 2017

        Hi ryclark, I really appreciate you responding so quickly. I took your advice and slowly applied smaller reductions with increasing FFT sizes with each pass. Though I didn't hear the audio getting any better, I feel it just continued to get worse.

        Does the percentage of the Noise Reduction stay at 10% and the Reduce by setting at 10dB as well, or should those change with each pass? And as far as the advanced settings should I just leave those alone? Thanks!

        PG_93
        PG_93Author
        Participant
        July 27, 2017

        Yes, Noise Reduction slider should stay at 10% (maybe 15% in a pinch) and keep the amount of reduction around 10dB (which, if you think about it, is a fairly big level change.  As before, start with a relatively low FTP setting, then increase by one preset for each pass.  This will normally do a good job of reducing any relatively continuous background noise--air conditioning, hiss from a mic pre amp, that sort of thing.

        A couple of things...for this to work you need to have gone back to you original recording.  It doesn't remove artefacts from something you've already tried NR on.

        Second, you haven't told us what kind of noise you are trying to remove.  The NR process is great on continuous back ground noise but if you have something variable, you may find you get more luck with the Sound Remover tool.  There's a tutorial here:  Use the Sound Remover effect |   Obviously this also needs you to go back to your original.


        So the noise I am trying to remove is consistent through the entire clip -- and it's just merely room/background noise underneath the interview. Honestly I figured it would be easier to remove but it's proven difficult. I am using the original recording, I haven't added any effects or changes to it since importing it from the original interview recordings. All I did was export and import it into Audition as a nested file.

        I'll try posting the recording on Dropbox, but I assume I would need your emails for you to be sent it or view it. If that is alright with you. I've already posted it. Let me know!

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