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help removing distortion from mp3s
panascit
post Apr 6 2013, 07:09
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hello. i'm wondering if anybody can please help me with the following problem:

i just downloaded a concert i recently recorded and it was clear right away that i had the levels turned up way too high. as a result, many of the songs have some degree of distortion (here's a sample: http://www.filedropper.com/sampzo030001-clip11_1).

i'm wondering if it's possible to have the recording cleaned up at all. i'm not technologically savvy -- this was actually my first ever attempt at bootlegging a show -- but from everything i've read it seems like there's no way to correct this issue.

i can't tell you how grateful i'd be if somebody could help me make this recording even slightly better.

if more information's needed please let me know. thank you so much.

tom
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carpman
post Apr 6 2013, 08:35
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Just a warning to anyone who downloads this file - it's very very loud (turn down your volume!) -- Track Gain = -18.27dB. Makes a nice solid waveform.

C.

ps. My 2 pennies worth: Nothing you can do to make it sound remotely acceptable.

This post has been edited by carpman: Apr 6 2013, 08:43


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Porcus
post Apr 6 2013, 11:36
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QUOTE (panascit @ Apr 6 2013, 08:09) *
i just downloaded a concert i recently recorded


... hmmmmmm?

Edit: Aha.

This post has been edited by Porcus: Apr 6 2013, 12:01


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carpman
post Apr 6 2013, 11:45
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The term download is often used instead of "transfer":
http://www.wikihow.com/Transfer-Images-fro...a-to-a-Computer

QUOTE
"Many cameras come with software to download pictures from your camera to your hard drive"

hmmmm ... wink.gif

C.


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panascit
post Apr 6 2013, 17:24
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that's what i figured. thanks anyway.

if there's any chance on god's green earth that somebody wants to take a stab at improving this recording even just a little please let me know. i'll happily compensate you for your work.

again, i appreciate the replies.
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Alexey Lukin
post Apr 6 2013, 18:16
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Your levels were +12 dB hot and the recording cannot be saved. You can make it sound slightly better with programs like Perfect Declipper or iZotope RX. Here's the kind of result you can expect: https://soundcloud.com/alexeylukin/declip
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Phlogiston
post Apr 12 2013, 16:51
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I couldn't download your link so have been unable to test the outcome.
I would put the file into Audacity. Use the amplify function to reduce the amplitude (about halfway across the graph)
Then use declip (whiich will take a while).
This has worked a treat with sligghtly distorted recordings, but I guess there's a point where you can't retrieve things

Best wishes
P

This post has been edited by Phlogiston: Apr 12 2013, 16:52
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Speckmade
post Apr 16 2013, 15:30
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Sadly the link to the file doens't seem to work.
QUOTE (Phlogiston @ Apr 12 2013, 17:51) *
I couldn't download your link

+1 :-/

QUOTE (Phlogiston @ Apr 12 2013, 17:51) *
I would put the file into Audacity. Use the amplify function to reduce the amplitude (about halfway across the graph)
Then use declip (whiich will take a while).

I agree Audacity has a great tuneable declipping function.
Depending on the source file there might be a little more you can do: With MP3, for example, its very well possible that some of the clipping is created when the file is being decoded. So you might be able to avoid some, in some more or less special cases all, of the distortion by bringing down the volume before decoding. There's specialised software around to do that, at least for MP3.
Maybe with some decoders something similar is possible with decoding to floating point sample values and attenuating afterwards.
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