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artatore
2007-12-24, 01:01 PM
OK, I had been using EAC to check my audios for being possibly mp3 sourced...
The defenition is easy - if it has any black spots - it is mp3 sourced, right!?
If there ain't any - it is mp3 free, right!?
However, I came across a bootleg that has one very thin red and yellow line that goes along 16000 on the graph. What does this thin red and yellow line mean??
That is like the one bootleg I had seen have that in my entire collection...
What does it look like if it is DAT sourced?
DAT is not same as mp3, must look differently...
Anyone???
I am sure this is not only my question.
Thanx everyone.

paddington
2007-12-24, 01:47 PM
ok...

EAC isn't real accurate for looking at spectrum analyzers spotting MP3... helpful, but not really good enough. Try Adobe Audtion.

the thin line is like just below 16kHz and generally means someone transferred the tape in the analog domain near a CRT (old computer monitor) that generates that noise - with an unsheilded cable or cheap soundcard. Means there is noise - nothing else.

You can't tell a DAT source from a spectrum analyzer display - unless it's 32kHz DAT - then you can only guess. Do not equate DAT with MP3 - DAT is uncompressed while MP3 uses lossy compression.

Five
2007-12-24, 02:17 PM
check over here:
http://www.thetradersden.org/forums/showthread.php?t=4288

especially here (read to pg2!)http://www.thetradersden.org/forums/showthread.php?t=1331

if you could give us some pics or a 10-20second FLAC sample (or just a short track) on rapidshare/sendspace or similar and link it up here we can check it out a little closer.

also take a look at some of the old threads here for a goldmine of knowledge on lossy/lossless:
http://www.thetradersden.org/forums/forumdisplay.php?f=47

happy holidays!

pawel
2007-12-24, 02:19 PM
the thin line is like just below 16kHz and generally means someone transferred the tape in the analog domain near a CRT (old computer monitor) that generates that noise - with an unsheilded cable or cheap soundcard. Means there is noise - nothing else.
Have you ever seen FM spectrum :lol

Five
2007-12-24, 02:47 PM
FM carrier is more like 19kHz

pawel
2007-12-25, 05:44 AM
FM carrier is more like 19kHz
yep but check recordings before 80s - the line if very often exactly at 16kHz

AAR.oner
2007-12-25, 10:09 AM
typically, a spike/stripe around 16kHz is indicative of a TV source somewhere in the lineage

as Five said, a 20 sec sample from the middle of one of the tracks would be helpful