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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 2005-04-25, 12:08 PM
kuschel kuschel is offline
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compressed? again..

hello..

i hope it's not annoying you..

i attached two pictures and would like to know whether this is MP3 sourced or not..

tauanalyzer says it's CDDA.. but.. well.. there's this sudden fall off..

thanks in advance..
Attached Images
File Type: jpg spec.JPG
( 43.1 KB, 63 views)
 
File Type: jpg frequ.JPG
( 60.1 KB, 51 views)
 
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  #2  
Old 2005-04-25, 12:17 PM
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Five Five is offline
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Re: compressed? again..

looks like it might be FM, TV or 32kHz DAT or maybe even lossy. I would have to see SA zoomed in to about 2 seconds to say more.
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  #3  
Old 2005-04-25, 12:37 PM
kuschel kuschel is offline
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Re: compressed? again..

had to explore how this zooming works.. anyway..

is it important to zoom a specific part?

Quote:
Originally Posted by Five
looks like it might be FM, TV or 32kHz DAT or maybe even lossy. I would have to see SA zoomed in to about 2 seconds to say more.
Attached Images
File Type: jpg zoomedfa.JPG
( 49.8 KB, 52 views)
 
File Type: jpg zoomedspec.JPG
( 122.4 KB, 62 views)
 
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  #4  
Old 2005-04-25, 04:02 PM
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Re: compressed? again..

this looks really suspicious to me, but I can't see any blocks. Is this two seconds? I can't tell because the display is set to bpm.

check your pm...
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  #5  
Old 2005-04-26, 02:12 PM
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ssamadhi97 ssamadhi97 is offline
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Re: compressed? again..

Typical mp2-ish fuzziness all over the place. I'd say analog recording (--> noise floor) of audio from a digital radio or tv broadcast.


Quote:
Originally Posted by kuschel
tauanalyzer says it's CDDA..
LOL. Really. Useless for detecting lossy audio sources.
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  #6  
Old 2005-04-30, 08:25 PM
NoddingTurdFAN NoddingTurdFAN is offline
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Re: compressed? again..

No kidding? Can you let me (us) know why you wouldn't say MP3 for sure? Is it because the drop is at around 15khz instead of 16khz? I need to do some more reading on FM I think....
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Old 2005-04-30, 10:34 PM
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Re: compressed? again..

ssamadhi97 means that this looks like an MP2 digital radio broadcast (lossy!) taped to analog which is why it looks lossy but we can't find the blocks when zoomed in. This is the best theory so far. I would love to hear a tracks to see if my ears can detect the lossy slurring sounds.
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  #8  
Old 2005-05-01, 06:45 AM
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ssamadhi97 ssamadhi97 is offline
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Re: compressed? again..

Quote:
Originally Posted by Five
I would love to hear a tracks to see if my ears can detect the lossy slurring sounds.
Probably not, because unless the bitrate is really low, mp2 has much better temporal resolution than mp3.
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  #9  
Old 2005-05-01, 08:27 AM
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ssamadhi97 ssamadhi97 is offline
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Re: compressed? again..

Quote:
Originally Posted by Five
[...] which is why it looks lossy but we can't find the blocks when zoomed in. [...]
Of course we can find them, though they're not as pronounced as usual - they're masked by background noise, blurred out by jpeg compression, and concealed further because 1) the zoomed range is longer than 2 sec I think and 2) they're generally much shorter than blocks caused by mp3 compression.

I'd like to have a short wav/lossless clip of that track to make "better" pics to illustrate this..

Until then, the pic I've attached will have to do. (sorry about the amateurish cropping, board wouldn't allow me to attach files > 620x280 O___o)
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( 59.5 KB, 79 views)
 
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