Anonymous
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MP3 Format for Lo-Fi (vs Hi-Fi) Source Material
#1025484 - 21/12/12 06:24 PM
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Hello, I'm just wondering (checking really) if MP3 encoding affects hi-fi more than lo-fi
recordings in any way.
I don't know why this would be the case, but I
remember FirstSounds, who released the first known phonautograph recording of a human
voice, answered a request for [.wav] file versions by stating that it would not offer any
improvement in audio quality than the [.MP3] download on their site.
Is this
(objectively) the case or merely a subjective claim based on what they'd expect most
people to notice? I mean, if someone wanted to try to 'restore' or bring certain elements
of the recording out, wouldn't they be better off using a high def [.wav] file?
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narcoman
active member
Joined: 14/08/01
Posts: 8469
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Re: MP3 Format for Lo-Fi (vs Hi-Fi) Source Material
[Re: ]
#1025490 - 21/12/12 06:38 PM
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they were fobbing you off!!!
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Anonymous
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Re: MP3 Format for Lo-Fi (vs Hi-Fi) Source Material
[Re: narcoman]
#1025492 - 21/12/12 06:41 PM
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It wasn't me who asked, it was either a comment or a FAQ, can't remember.
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Anonymous
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Re: MP3 Format for Lo-Fi (vs Hi-Fi) Source Material
[Re: ]
#1025493 - 21/12/12 06:44 PM
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Found it... http://firstsounds.org/faq/Q. Can I get uncompressed
versions of your recordings without losses due to mp3 encoding? A. Our
experiments have shown that the 128 kbps mp3 files available on FirstSounds.org are more
than sufficient to convey all audio information in the original phonautograms.
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Hugh Robjohns
SOS Technical Editor
Joined: 25/07/03
Posts: 18390
Loc: Worcestershire
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Re: MP3 Format for Lo-Fi (vs Hi-Fi) Source Material
[Re: ]
#1025494 - 21/12/12 06:57 PM
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Quote:
Our experiments have
shown that the 128 kbps mp3 files available on FirstSounds.org are more than sufficient to
convey all audio information in the original phonautograms.
Technically, this is inaccurate. Lossy audio
codecs inherently throw away some audio information.
However, the information
thrown away may well be inaudible and irrelevant given the inherently poor quality (in
relative terms) of the source -- ie. the stuff thrown away might well just be noise
elements.
H
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Technical Editor, Sound On Sound
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Anonymous
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Re: MP3 Format for Lo-Fi (vs Hi-Fi) Source Material
[Re: Hugh Robjohns]
#1025496 - 21/12/12 07:26 PM
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Thanks for that. It's quite interesting too.
Is it possible to determine if
those elements thrown away are pure noise? I don't suppose it's possible to separate noise
(using a noise reduction tool?) and apply compression to those elements more than 'wanted'
sound...?
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Hugh Robjohns
SOS Technical Editor
Joined: 25/07/03
Posts: 18390
Loc: Worcestershire
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Re: MP3 Format for Lo-Fi (vs Hi-Fi) Source Material
[Re: ]
#1025515 - 21/12/12 10:58 PM
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Quote Josif A. Soterίou:
Is it
possible to determine if those elements thrown away are pure noise?
Yes, but only by comparing the mp3 file with
a full resolution wav file, in a null test.
Hugh
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Technical Editor, Sound On Sound
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