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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 2004-12-08, 12:34 AM
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Is this mp3?

I could use some more opinions on this show. I know this was an original cassette master, which at some generation was put to cd. Does anyone think this has mp3 lineage in it?

Thanks in advance.
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File Type: gif freq.GIF
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File Type: gif spec.GIF
( 83.6 KB, 440 views)
 
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  #2  
Old 2004-12-08, 02:19 AM
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Re: Is this mp3?

looks OK to me, maybe MiniDisc, but not MP3
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  #3  
Old 2004-12-08, 03:49 AM
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Re: Is this mp3?

Doesn't look like mp3 to me either. FM? That black "line" of space in the top area I think indicates something, I think that it's an FM signal, but I could be wrong. Perhaps someone else will know what and if that's true that it even means anything.

On mp3s the freq will drop off at around 16khz. And the spectral view will show a hard line across the top where the sound cuts off, what is called a "haircut". Neither pic indicates these.
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  #4  
Old 2004-12-08, 04:25 AM
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Re: Is this mp3?

What show is that (Dublin?). I agree with Nina looks more like a FM.
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  #5  
Old 2004-12-08, 06:41 AM
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Re: Is this mp3?

Doesnt FM radio normally show a spike at around 19khz? , might the missing black band 16-18khz be some sort of noise reduction ?
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  #6  
Old 2004-12-08, 08:25 AM
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Re: Is this mp3?

This is absolutely NOT mp3 by any means. Might not be FM, cass has similar fading of the upper end. I think that what I'm looking is perfectly normal for a Cass(x) > CDR, with no foul play suspected on my part.
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  #7  
Old 2004-12-08, 09:30 AM
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Re: Is this mp3?

Okay thanks everyone, this is a audience recording, not a great one by any means. At any rate, just wanted to get some second and third opinions.
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  #8  
Old 2004-12-08, 06:40 PM
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Re: Is this mp3?

The straight, level blackness above 16kHz sure raises my suspicions.
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  #9  
Old 2004-12-08, 07:08 PM
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Re: Is this mp3?

There's a 20db falloff at around 10k that doesn't look like the gradual freqency deterioration that you get from magnetic tape generations.

FM falloff is at the 15k carrier, so that's not it. If anything, it LOOKS like a normal analog gen that went through a REALLY FUBARED generation somewhere along the line. Doesn't look like great sounding audio, but certainly doesn't look like a "lossy encoded" product.
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Old 2004-12-08, 07:11 PM
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Re: Is this mp3?

I don't know what this is but is sure isn't mp3. I would love to check 2-second sample of this just for curiosity, either posted here as FLAC in a .zip or pm me for me my email.
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  #11  
Old 2004-12-08, 09:21 PM
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Re: Is this mp3?

Here's a 4 second sample of one of the songs.

Well stand by, the attachment pop up window doesn't like the .flac extension
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  #12  
Old 2004-12-08, 09:34 PM
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Re: Is this mp3?

Well I can't get the 2 second sample below the 97kb limitation. I'll send you a pm.
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  #13  
Old 2004-12-09, 01:02 AM
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Re: Is this mp3?

OK, I got the sample and looked at it in CEP... This looks and sounds like 128kb/s cbr mp3. The classic indications are there: the fa drops off right at 16kHz, the sa shows a perfect straight cutoff at 16kHz with pure black above, and you can see some blocky black bits within the audio.
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File Type: gif dr_sa.gif
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  #14  
Old 2004-12-09, 02:05 AM
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Re: Is this mp3?

well, that frequency analysis is a lot different than what he originally posted
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how can I obey the rule about no sexually explicit posts after seeing Lynne's back?

Quote:
Originally Posted by Rider
I think Gray has all these grand plans and I'm sorry to bring it up when it came down to it he couldn't even sell t-shirts without fucking it up.

"please mind your own fucking business, you Looney cocksucker" - Freezer, 7/12/06
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  #15  
Old 2004-12-09, 02:16 AM
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Re: Is this mp3?

That's for sure. desert_rat are you sure you sent him the clips from the same tracks you got your fa and sa from? I don't see how those can be from the same track.
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