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noise reduction/restoration process

Explorer ,
Jul 08, 2020 Jul 08, 2020

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I'm recording an audio book.  For certain sounds there is a spike/buzz from my narrator.  I've been highlighting these individually and then running the noise reduction/restoration process to fix them but it is super time consuming.  Is there any reason why I couldn't highlight the entire chapter and run it through the process?  Will it eliminate too much overall? 

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How to , Noise reduction

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Community Expert ,
Jul 08, 2020 Jul 08, 2020

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Couldn't really tell you without hearing a sample, but NR to fix that sort of problem doesn't quite seem appropriate, somehow. Could you post a sample? Preferrably not an MP3 but a short wav clip. MP3s degrade everything too much when it comes to that sort of repair...

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Explorer ,
Jul 08, 2020 Jul 08, 2020

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Hi.  I can't figure out how to add an attachment, so I am going to post my question again with the file. Thanks so much! 

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Explorer ,
Jul 08, 2020 Jul 08, 2020

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Hi again, 

 

I have attached a sample of one of my files for a audio book I'm recording.  Throughout the entire book, there are a lot of buzzy/glitchy sounds, especially where the volume is high. I was taking each spike, running it through the noise reducer and using the pop reducing process and I'm wondering if I can just select the entire file and do this or would it eliminate too much other good sound? 

 

Thanks for your help! 

Lara

 

[Mod note; replies concatenated into a single thread]

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Community Expert ,
Jul 09, 2020 Jul 09, 2020

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Your fundamental problem here is that the audio is clipping, and that's what causes the buzzes and glitches. And it's pretty bad; the de-clipper found 175 of them, just in that sample. What's worse is that even if you run the de-clipper (which is inevitably imperfect, because it has no reference for what should be happening at that instant), you're still left with some almighty glitches like this:

Glitch.JPG

That occupies the entire audio spectrum, and nothing is really going to get rid of it. You might be able to reduce the effect of it by painting out the offending bits and leaving the speech, but even that's not going to be perfect and it's an almighty pain to do all of them.

 

The problem here is that when it was recorded, the mic gain was either too high, or the speaker was a lot too close to the mic - or both. Once you've overloaded the mic preamp, you're basically stuffed; it's unfixable by any realistic means, as the signal has reached the limit of what can be digitised, and stopped dead - instant distortion. What you need to do is record this at a significantly lower level which will leave you some room for adjustments and alterations. As it is, the audio's going to need at least some limiting before it's acceptable for production, and probably a bit more work too. Can you outline exactly how this recording is being made? Almost certainly we can come up with some improvements...

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Community Expert ,
Jul 09, 2020 Jul 09, 2020

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The other thing is that I can hear a load of artifacts from the NR you've already done to the file. There are techniques for applying NR that are a lot more effective, and really you need to establish both a recording and processing regime in order to maximise the quality. We can advise!

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Explorer ,
Jul 09, 2020 Jul 09, 2020

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Thanks!  We are getting somewhere!  So I just looked at my microphone and it appears that I have been recording with the GAIN knob turned all the way up.  Could this be the problem? 

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Community Expert ,
Jul 09, 2020 Jul 09, 2020

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Is the Pope a Catholic?

 

Yes, that will very much be at the root of your problems! If you set Audition up to monitor the input on the meters before you start recording, you want the peaks to go no higher than about -10dB. A lot of things will make more sense after you've done this...

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Explorer ,
Jul 09, 2020 Jul 09, 2020

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Got it!  Thank you SO much! 

 

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