Noise Reduction remnants.

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Noise Reduction remnants.

Permanent link to this post Posted by MichloIW » Thu Feb 22, 2018 9:03 pm

Greetings, all.

I've had a problem with Audible for as long as I've been using it and tis probably time I asked about it.

I THINK it is a remnant of the noise reduction process. At the end of almost every sentence, I have a little extra sound. It doesn't seem to be part of the word because I can cut it right before that sound without the word being damaged so I can only imagine it is left over from the noise reduction. I don't know how else to explain it so here is a link to a tiny sample:

https://1drv.ms/f/s!Ai1k90-SUXL_w9sHSXqHwCRufnoGGg

Up till now I've always manually gone through and punch/pasted it away but that is so time-consuming. So, is there a better way? Does anybody know what I'm blathering on about? Heh.

My usual noise reduction settings (gleaned from my long Audible post of yore): 18/06/02. I'm using Windows 10 with Audacity 2.1.3.

Any advice would be most appreciated. :)

Cheers.
Last edited by MichloIW on Fri Feb 23, 2018 9:33 pm, edited 2 times in total.
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Re: Audible remnants.

Permanent link to this post Posted by Trebor » Thu Feb 22, 2018 10:22 pm

MichloIW wrote: At the end of almost every sentence, I have a little extra sound. It doesn't seem to be part of the word because I can cut it right before that sound without the word being damaged so I can only imagine it is left over from the noise reduction ... Up till now I've always manually gone through and punch/pasted it away but that is so time-consuming. So, is there a better way?

A noise-gate will do that automatically, (rather than maually), but it can cut-off the beginnings & ends of words if you're not careful.

''I had ever known'' original -gated-then EQed.flac
(221.66 KiB) Downloaded 13 times

https://en.wikipedia.org/wiki/Noise_gate
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Re: Audible remnants.

Permanent link to this post Posted by MichloIW » Fri Feb 23, 2018 8:08 pm

Thank you, Trebor. I'll have a look at the function. :)

Nobody has any ideas on what is causing this in the first place then?

Cheers.

Edit: Hmm, I can't find anything in the manual or wiki on Noise Gate. :(
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Re: Audible remnants.

Permanent link to this post Posted by Trebor » Fri Feb 23, 2018 8:37 pm

MichloIW wrote:... any ideas on what is causing this in the first place then?

The performer & mic, rather than processing, IMO.
Paul-L's DeClicker plugin can remove a lot of clicks & pops.
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Re: Audible remnants.

Permanent link to this post Posted by MichloIW » Fri Feb 23, 2018 9:35 pm

Trebor wrote:
MichloIW wrote:... any ideas on what is causing this in the first place then?

The performer & mic, rather than processing, IMO.
Paul-L's DeClicker plugin can remove a lot of clicks & pops.


Thank you. I'm sure that is part of it but some of these noises do not sound natural or something I could produce and are sometimes between sentences. :P

Edit: From experimenting, it seems to be all about where I take the noise sample from.
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Re: Noise Reduction remnants.

Permanent link to this post Posted by kozikowski » Sat Feb 24, 2018 4:39 am

Post a ten second stereo sample or twenty second mono sample of original work on the forum. No processing, effects or filters. Raw recording. Alternately, burn a new sound clip according to this recipe.

http://www.kozco.com/tech/audacity/Test ... _Clip.html

Doesn't matter what the words are, but you should get the basic format in. Two seconds of dead silence where you hold your breath and don't move around and then the rest whatever you have in front of you. Don't cut it short.

"Kellogs Corn Flakes are part of a nutritious, balanced breakfast..."

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Re: Noise Reduction remnants.

Permanent link to this post Posted by MichloIW » Sat Feb 24, 2018 10:08 pm

Thanks, Koz.

I've added the same piece (with a few extra seconds) so that you may see the difference.

https://1drv.ms/f/s!Ai1k90-SUXL_w9sHSXqHwCRufnoGGg

Yes, I'm very clicky this day but, thankfully, I'm able to clear those easily.

With some more experimenting, just noise cleaning on the pieces I would usually choose for the sample, I can see that it leaves the beginning and end of the selected portion. I'm sure this is so that words aren't cut off but my settings seem to be leaving a little too much. Could that be it?

Cheers.
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Re: Noise Reduction remnants.

Permanent link to this post Posted by Trebor » Sat Feb 24, 2018 11:36 pm

MichloIW wrote:... https://1drv.ms/f/s!Ai1k90-SUXL_w9sHSXqHwCRufnoGGg
Yes, I'm very clicky this day but, thankfully, I'm able to clear those easily

The clicks are on the RAW version , so not processing-artifacts.
These DeClicker settings gets rid of most of them ...

Suggested DeClicker settings.png
Suggested DeClicker settings.png (20.78 KiB) Viewed 378 times

''cheese'' RAW, then DeClicked & Noise-Reduction & Noise-gate.flac
I've over-done the NR & Gate a bit
(460.71 KiB) Downloaded 15 times
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Re: Noise Reduction remnants.

Permanent link to this post Posted by MichloIW » Sun Feb 25, 2018 2:13 am

Thanks, Trebor but yes, I'm not referring to my nemesis, my mouth-clicks, as the artifacts. :)

Fortunately, since I've still never managed to eliminate them from the source (me!) I'm able to clean those.

Cheers.
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Re: Noise Reduction remnants.

Permanent link to this post Posted by kozikowski » Sun Feb 25, 2018 4:16 am

There is something wrong with the first word or two??? Everything else sounds OK.

You are overdoing your noise reduction and/or under-doing your studio noise suppression. I count at least two different vent fans running in the background and there may be more individual noises I couldn't identify.

The background noise in the raw sample came in about -50dB, significantly louder than the AudioBook standard of -60dB. Sound doubles each 6dB.

Your patched sample background noise was -80dB. Extreme noise reduction like that will cause weird, ghostie artifacts. It's one of the reasons the tool was changed from the earlier "Noise Removal." It's not intended to totally remove noise. If you try, you get the damage you got. (Noise Removal also sucked much of the time, which is another reason it was changed).

One serious Noise Reduction artifact is boosting sibilants and ticking. If you weren't harsh and spiky before, you will be after.

I applied simple Audiobook Mastering 4 followed by Noise Reduction 9, 6, 6, It passes audiobook requirements and sounds exactly like you.

Screen Shot 2018-02-24 at 19.42.26.png
Screen Shot 2018-02-24 at 19.42.26.png (41.16 KiB) Viewed 368 times


If you want better background suppression, suppress the actual background. If you don't, the tools build on each other. Noise Suppression creates artifacts, sibilance and ticking. This tool gets rid of the tails, that tool suppresses the sibilance, this other tool corrects errors of the first two. Then you can run...........

Or you can identify the noises and turn them off while you're recording.

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