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Loud room audio cleanup

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Loud room audio cleanup

Postby PhilC34 » Mon Apr 15, 2019 3:52 pm

Hi Guys. I'm after a bit of a hero. I recently got back from a trip to a convention with a bunch of interviews recorded, however all of the audio from the card got completely corrupted and I am now stuck with the cameras on board audio as the only audio I have. It is not good to say the least.

The room is very loud and you can barely hear the interview over the noise. I have tried using noise reduction in Audition to remove some of the general room sound which is helping but isn't too great. My knowledge on this is limited so I wondered if anyone has any tips/techniques that I could try to maximise what I have. I'm not expecting perfection/just something that it is audible. Any help you could give would be HUGELY appreciated.

Here is a link to a short clip so you can hear what I am talking about:

https://drive.google.com/file/d/1gN0AVs ... sp=sharing
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Re: Loud room audio cleanup

Postby The Elf » Mon Apr 15, 2019 5:03 pm

I think you're going to struggle to make anything from that example.

First question - what do you mean by 'corrupted'? A lot can be done with data recovery these days.
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Re: Loud room audio cleanup

Postby James Perrett » Mon Apr 15, 2019 5:16 pm

As Elf says, it would be worth making some more effort to recover the data. Do you have a card reader so that you can read the card in a PC? Have you tried using something like Recuva to find any deleted files? Even if you have lost the headers, Audition can open partial files in RAW mode.

Having taken a quick listen it won't be easy to extract the voices. I'd think about trying Audition's Center Channel Extractor in two passes - one for each voice.
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Re: Loud room audio cleanup

Postby PhilC34 » Mon Apr 15, 2019 5:46 pm

I've done everything I can with the audio card. The card itself is physically broken and so can't be read on anything. Not sure what the guy who had it has done to it but that's a story for another time I guess!

I'm just after anything to raise the voices above the admittedly way too loud room now.

Thanks so much for your help by the way!
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Re: Loud room audio cleanup

Postby blinddrew » Mon Apr 15, 2019 9:58 pm

Just had a quick listen. There's a lot of the background noise out wide, what does the mid signal sound like?
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Re: Loud room audio cleanup

Postby Mike Stranks » Tue Apr 16, 2019 10:56 am

I've put the clip through Izotope RX6 'Voice Denoise' and made it a mono file. That certainly helps intelligibility, but I suspect it falls significantly below what's acceptable for a published video.

Spectral editing could deal with some of the 'noises off', but because most of the background noise is other people talking then differentiating between wanted and unwanted frequencies is nigh-on impossible.
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Re: Loud room audio cleanup

Postby James Perrett » Tue Apr 16, 2019 11:22 am

I wouldn't be surprised to find that the technology exists for extracting one voice from a crowd like this (a bit like the vocal extraction in RX7's music rebalance feature) but I would guess that it is too specialist to be included in music oriented tools.
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Re: Loud room audio cleanup

Postby Tim Gillett » Tue Apr 16, 2019 2:27 pm

PhilC34 wrote:I've done everything I can with the audio card. The card itself is physically broken and so can't be read on anything. ..

These cards are normally pretty robust. Any chance of a good photograph of the damage?
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Re: Loud room audio cleanup

Postby ef37a » Tue Apr 16, 2019 8:43 pm

Tim Gillett wrote:
PhilC34 wrote:I've done everything I can with the audio card. The card itself is physically broken and so can't be read on anything. ..

These cards are normally pretty robust. Any chance of a good photograph of the damage?

Indeed, I managed to solder the tracks on a seriously bent one and got the data out. You need a fine tip, a bench magnifier and very steady hands. Had it all once!

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