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In Reply to: RE: Spectrum Plot for CD rip and 24/96 download - pics posted by AbeCollins on July 11, 2014 at 15:18:26
Led Zep 2 vinvyl, Bring It On Home, rockin part near the end, Atlantic SD19127, ST-A-691672WW-REPL from the deadwax among other things. System listed in inmate systems. You can see 60kHz spike at about `-105dB peak which I've presumed to be an artifact of my crappy little walwarts feeding my dual Cambridge 651p's.The interesting thing to note is a complete apparent lack of the 28KHz spike. As I was watching the thing bounce as it sampled. It seemed apparent there is signal bouncing to the music clear up to the 50KHz range. You may also find it interesting to note that I saw no 28KHz anywhere in the signal while I listened and was taking samples of various parts of the song, even during the quiet part there was no 28KHz.
Same conditions as my other screen capture post. 24bit 192kHz sampling, 2^14 points averaging, Blackman Harris 4 window, no weighting blah blah blah same stuff
Edits: 07/13/14 07/13/14 07/13/14Follow Ups:
My Led Zep II is the 2014 reissue, Atlantic. The Ponty album is also Atlantic. However, I also found it on an A & M recently reissued by QRP.
It is not a constant tone. I can move through the file .328 seconds at a time.
.328 seconds later
.328 seconds later
.328 seconds later
.328 seconds later
.328 seconds later
To me it seems apparent it must not have been on the original since it isn't in my vinyl that I can see. Of course I only have one pressing of many, not even considered the best pressing by aficionados.
Does exist on various digital remasters in yours and Abes possession.
Signs point to it likely being an artifact of one or more digitization processes whether intended or not.
I'm going with not as the most likely answer but there are always the tin hat theories.
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