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Lossy or Lossless? Please use this forum to post spectral and frequency analysis posts about shows you have your doubts about.

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  #1  
Old 2006-03-15, 12:43 PM
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1st show from 85

Hey all , im looking for a few opinions on these 2 1985 shows.
Going by the Freq analysis both would be a safe bet to have mp3 in the lineage , But looking at the 2 sec closeup things change.There are neither holes or the floating Blocks.
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File Type: jpg SOM 01-05-85 freq.jpg
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File Type: jpg SOM 01-05-85.jpg
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File Type: jpg SOM 01-05-85 2sec.jpg
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  #2  
Old 2006-03-15, 02:47 PM
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Re: 1st show from 85

While the other one is "iffy", this one looks fine. Again, get a second opinion.

EDIT: I should have said before that I'm not 100% how much music is actually here because it seems to be buried in a lot of hiss.

Last edited by LocalHero; 2006-03-15 at 02:55 PM.
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  #3  
Old 2006-03-15, 02:57 PM
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Re: 1st show from 85

like you say, no direct evidence since there's no blocks. strange that it cuts off so abruptly at about 16kHz.

if you can up a 10-20second FLAC sample I would like to have a closer look and listen (use yousendit.com / rapidshare.de)
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  #4  
Old 2006-03-16, 08:00 AM
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Re: 1st show from 85

Could you please up a flac sample?
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  #5  
Old 2006-03-16, 10:35 AM
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Re: 1st show from 85

mp3, I'm pretty sure. mp3 encoders usually don't waste bits above 16kHz (remember, it's disproportionately expensive) if these frequencies are masked by loud music in the lower ranges anyway.

(also looks like a subtly uneven cutoff to me)
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  #6  
Old 2006-03-16, 10:57 AM
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Re: 1st show from 85

Actually you know what......I would really love in this case to see a black and white spectral view. That make the lows come out a bit darker so you can see through all of that hiss.
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  #7  
Old 2006-03-16, 12:39 PM
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Re: 1st show from 85

Short sample here

http://rapidshare.de/files/15660861/...5-85.flac.html
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  #8  
Old 2006-03-16, 12:49 PM
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Re: 1st show from 85

Good thing we got a hold of that sample.

This is 100% lossy.

1.) Just listen to it. It sounds like an mp3.
2.) The frequency analysis is so obvious, it's not even funny.
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  #9  
Old 2006-03-16, 01:59 PM
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Re: 1st show from 85

Yeah the Freq analysis is as i posted originaly.As i first posted the Freq and Spectral both scream mp3 , but its the 2 sec close up that doesnt show what you would expect to see , namely the blockiness and holes..........
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  #10  
Old 2006-03-16, 02:45 PM
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Re: 1st show from 85

^that's exactly how I see it.

I looked at it in b&w zoomed to 2 seconds and scrolled thru the entire sample in this view looking for lego to no avail. I also listened to it and didn't hear hear the swish on the cymbals that normally tips me off. The cutoff is steep as hell (as we already knew) and in about the right place for this to be 32kHz DAT, but it looks too straight to be 32kHz DAT, in that case the "haircut" would have some stubble.

There is something very fishy with this one but I cannot find any direct evidence of lossy encoding here. I would continue to seek an alternate source and only trade this show one-on-one with others & including this information about the suspicious nature of the FA/SA.

here is a b&w SA showing the closest thing to blocks I could find along the top there.
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  #11  
Old 2006-03-16, 02:49 PM
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Re: 1st show from 85

hey man can you post another sample which has a lot of cymbals on it? I'd like to have a listen to that if its not too much trouble.
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  #12  
Old 2006-03-17, 11:18 AM
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Re: 1st show from 85

Evidence enough for me to think that it's mp3...
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  #13  
Old 2006-03-17, 11:50 AM
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Re: 1st show from 85

good eye

thanks for finding that

this is mp3

seek thee a new & better source
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  #14  
Old 2006-03-17, 12:38 PM
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Re: 1st show from 85

Quote:
Originally Posted by ssamadhi97
Evidence enough for me to think that it's mp3...
Thats wierd , Ive zoomed in to the same place and cant see the holes.
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Last edited by elguiri; 2006-03-17 at 12:46 PM.
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  #15  
Old 2006-03-17, 01:18 PM
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Re: 1st show from 85

try switching it from that green to deault (F4 to get to the settings)
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