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Old March 15th, 2014, 06:52 AM   #1
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Improving gross overload

I have been given a grossly overloaded file and while I realise there is not a lot you can do to rectify this, I was wondering if there just happened to be some software now that that may give me a chance to even slightly improve it over the usual audio restoration tools. I have Sound Forge 9.

RonC.
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Old March 15th, 2014, 09:27 AM   #2
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Re: Improving gross overload

Ron, I have had great success with Isotope 3. You can try out the software for 10 days free.
iZotope RX 3 | OVERVIEW

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Old March 15th, 2014, 10:09 AM   #3
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Re: Improving gross overload

If you can post a clip, we could better render an opinion. Digital overs are one thing, preamp overdrive is another. If it's the latter, nothing's going make it pristine, not even the advanced version of iZotope RX3.
Sound Forge Pro 11 does come bungled with a iZotope restore that works fairly well on analog distortion.
Check out the SCS SF webinars.
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Old March 15th, 2014, 12:38 PM   #4
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Re: Improving gross overload

I work in audio production too and I have some tools for audio restoration at disposal in my studio.

PM me or post a short sample here (10 seconds will be enough, no mp3, uncompressed wav please) and I'll PM you back after I give it a try.
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Old March 15th, 2014, 09:47 PM   #5
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Re: Improving gross overload

Thanks all. - This is a wonderful forum. Hope this attatchment works ! - If it does not, can you please tell me how to do it.

RonC.
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Old March 16th, 2014, 08:23 AM   #6
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Re: Improving gross overload

Aww, never mind...Sorry about that.
Was going to respond and just had a huge brain freeze. :-(
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What do I know? I'm just a video-O-grafer.
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Last edited by Don Bloom; March 16th, 2014 at 08:25 AM. Reason: delete post due to brain freeze.
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Old March 16th, 2014, 10:08 AM   #7
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Re: Improving gross overload

Don't see it Ron.
At the bottom of the reply window select "Manage Attachments"
Select the desired file from your computer and click "Upload". If that doesn't work use Dropbox, 4-Shared, YouSendIt, Google Drive or other file sharing site.
I have previously not attached audio files, the attached is for confirmation.
Attached Files
File Type: wma Blues Closet- test file.wma (158.7 KB, 35 views)

Last edited by Rick Reineke; March 16th, 2014 at 12:49 PM. Reason: Test
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Old March 18th, 2014, 06:22 AM   #8
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Re: Improving gross overload

Ah, thanks, now I see how to do it. - I was looking in the wrong spot.
So hopefully here's the upload.

RonC.
Attached Files
File Type: wav O'Load sample 2 (wav).wav (1.58 MB, 44 views)
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Old March 18th, 2014, 08:18 AM   #9
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Re: Improving gross overload

I'll give it a try later, but I can tell you right away that it will be full of artifacts as it's so distorted.
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Old March 18th, 2014, 07:58 PM   #10
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Re: Improving gross overload

Nice clean recording of the room tone...
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Old March 18th, 2014, 11:41 PM   #11
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Re: Improving gross overload

OOOh,my goodness, this is a tough one! Lots of artifacts, to be sure. I'll offer what I could do in the hope that somebody does lots better and I can learn from them:

My tools:
Adobe Audition CS6. Heavy Declip function using Fourier 128bit transform. Followed by level adjustment, then noise reduction to remove the loud room tone, followed by EQ, rolling off below 200hz for boominess and gently rolling off above 1500 hz trying to remove some of the sibilance. Then fairly heavy compression to try to level out the amplitude.

It's some better, but that's a real damaged track, I'm afraid. Comments?
Attached Files
File Type: wav overoad declip denoise eq compress.wav (1.57 MB, 45 views)
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Old March 19th, 2014, 06:54 AM   #12
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Re: Improving gross overload

Mr. Vaughan,

That's better than I would have thought possible. But, out of curiosity, I would very much like to hear it without the denoise function.

Thanks.
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Old March 19th, 2014, 12:50 PM   #13
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Re: Improving gross overload

I'll go back and try without the denoise, and post it, but I can tell you the room tone is fairly overwhelming, and drowns out the voice portion.. Taking out that random noise made the voice much more audible and the breaks between words more clear. Without doubt it had a significant effect on the voice frequencies, leading to the somewhat robot-voice effect we are left with...but I'll pop up a sample soon as time permits...thanks for your feedback!
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Old March 19th, 2014, 01:02 PM   #14
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Re: Improving gross overload

Thanks,

The robotic nature of the voice is what I'm curious about. I was wondering whether the track would be more intelligible without the heavy NR.

I tried several variations of LPF before and after de-clipping, but never got a result that sounds even vaguely like a finished track. The resulting track might be useful for manual transcription, if you want a written record of what was said, but certainly not even close to good audio quality.

Interestingly, while my de-clipped version looks quite different from the original, there is often no significant difference in intelligibility! (This makes me wonder whether the human psycho-auditory mechanism has a de-clipping function.)
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Old March 19th, 2014, 02:24 PM   #15
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Re: Improving gross overload

Here are three versions: straight heavy declip using Fourier 128 bit; same with denoise added; same as #2 with eq added to rolloff below 200hz and above 3000hz (trying to get rid of the 'spatter' artifacts with limited success). This is a toughie. But you're right, I think the heavy nr did more damage than good, this voice is less robotic. This time around, the room tone was less intrusive, I think I may have amplified it with something I did in the first version, about the level-adjust stage. It was like a freight train in the room before n/r in the first version.
Attached Files
File Type: wav ovewrload nodenoise.wav (1.73 MB, 57 views)
File Type: wav overload_denoise_eq.wav (1.73 MB, 51 views)
File Type: wav overload_denoise.wav (1.73 MB, 46 views)
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