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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 2005-03-12, 06:52 PM
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MP3 Scourced???

I am attaching a few screens shots. They only reason why I want some views because I do remember that recordings from FM broadcast can have drop offs similiar to mp3 scourced material.
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Old 2005-03-12, 06:52 PM
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Re: MP3 Scourced???

Frequency Analysis #1
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Old 2005-03-12, 07:07 PM
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Re: MP3 Scourced???

Frequency Analysis 2
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Old 2005-03-12, 07:08 PM
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Re: MP3 Scourced???

Spectral
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  #5  
Old 2005-03-12, 07:08 PM
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Re: MP3 Scourced???

This is Tales of the Who which if I remembered downloaded from STG last summer
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  #6  
Old 2005-03-12, 07:48 PM
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Re: MP3 Scourced???

mp3. Wish i could see the numbers a little better, but even without that, it looks bad.
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Old 2005-03-12, 07:51 PM
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Re: MP3 Scourced???

It doesn't look good, but I can't post anything conclusive yet...

can you show the spectral view zoomed in to 1.5-2 seconds? also, another SA with the FFT size set to max would help a little.

check the link in my sig for detecting mp3-sourced stuff, EAC is a bit hard to read.
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Old 2005-03-12, 08:29 PM
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Re: MP3 Scourced???

That looks like FM
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  #9  
Old 2005-03-12, 09:25 PM
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Re: MP3 Scourced???

hmmm...

how about Adobe Audition Spectral view, zoomed in on 2 seconds and also showing a full song?

This doesn't look good to me so far.
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Old 2005-03-12, 10:38 PM
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Re: MP3 Scourced???

FM radio rolls off hard at around 15kHz. (The response is 15kHz wide and starts at 50Hz or so).
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  #11  
Old 2005-03-14, 08:29 AM
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Re: MP3 Scourced???

I think it looks like non-mp3. The fact that the right and left channels each roll off at a different spot would be a dead giveaway.
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  #12  
Old 2005-03-14, 08:51 PM
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Re: MP3 Scourced???

I wouldn't say so. mp3 encoders are not forced to use the same lowpass for both channels.
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Old 2005-03-14, 09:19 PM
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Re: MP3 Scourced???

Quote:
Originally Posted by jameskg
FM radio rolls off hard at around 15kHz. (The response is 15kHz wide and starts at 50Hz or so).
James,

Actually, there is no lower frequency limit to FM broadcasting, only the 15kHz upper range (as you mentioned). Looking through the FCC Part 73 specs, I don't see anything addressing highpass filtering.
(http://www.scott-inc.com/html/fccrules.htm)

Also, see:
http://www.radio-electronics.com/inf...ffm/vhf_fm.php
for a pretty nice explanation of FM mux/demux.

I guess I should add that the individual FM receiver will probably be the limiting factor, not the broadcast.

Last edited by wazoo2u; 2005-03-14 at 09:24 PM.
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  #14  
Old 2005-03-15, 02:03 AM
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Re: MP3 Scourced???

I still wanna see Audition Spectral Analysis zoomed in on 2 seconds. I don't think we can draw any conclusions from what we see here.
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