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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 2010-01-30, 06:34 PM
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Strange looking analysis.. Could anybody have a look?

I got this strange looking file, could anybody tell me what that could be? Why does it cut at 18khz and not 16 or 20.5? And what's that purple stripe? Thanks in advance!
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File Type: jpg StrangeSource2.jpg
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  #2  
Old 2010-01-30, 06:37 PM
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Re: Strange looking analysis.. Could anybody have a look?

The 2nd pic is a 2 second sample, btw.
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  #3  
Old 2010-01-30, 06:52 PM
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Re: Strange looking analysis.. Could anybody have a look?

that stripe is a pilot tone [shows as a spike in the FA]...looks to be from a TV source since its in the 15-16kHz region...a pilot tone at 19kHz indicates a FM source
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  #4  
Old 2010-01-30, 06:55 PM
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Re: Strange looking analysis.. Could anybody have a look?

I thought about that as well, but i'm pretty sure this show was never broadcasted, neither TV nor FM.
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  #5  
Old 2010-01-31, 03:27 AM
lintoni
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Re: Strange looking analysis.. Could anybody have a look?

Quote:
Originally Posted by Dizcipline View Post
I thought about that as well, but i'm pretty sure this show was never broadcasted, neither TV nor FM.
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  #6  
Old 2010-01-31, 05:02 AM
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Re: Strange looking analysis.. Could anybody have a look?

That's quite interesting... And it makes kinda sense... Thanks for that info, lintoni!

But what about the cut off frequencies? Would you consider this 100% lossy? Is the cut at around 18khz just the result of a high bitrate mp3 conversion? Thanks so far, guys!
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  #7  
Old 2010-01-31, 06:32 AM
lintoni
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Re: Strange looking analysis.. Could anybody have a look?

If you could post a spectral screenshot of 2-3 seconds, that might help.
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  #8  
Old 2010-01-31, 08:13 AM
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Re: Strange looking analysis.. Could anybody have a look?

Like this? That's a two second snippet from the file.
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  #9  
Old 2010-01-31, 04:45 PM
lintoni
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Re: Strange looking analysis.. Could anybody have a look?

Hmm... looks ok to me. Possibly somebody has used some noise reduction, which is why there's the 18k cut off. Strange that they didn't take care of the spike at 15.7kHz while they were at it.
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  #10  
Old 2010-01-31, 05:29 PM
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Re: Strange looking analysis.. Could anybody have a look?

Cool, thanks. See, that's the kind of stuff i didn't think of. Never knew that NR could lead to such a "clean" cut. Thanks for your help!
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  #11  
Old 2010-02-01, 02:30 AM
lintoni
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Re: Strange looking analysis.. Could anybody have a look?

Or simply used a brickwall filter at 18kHz to cut everything off. But it looks like a lossless source to me.
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