Spectrograms of vinyl- What am I seeing here?
In a bout of temporary insanity I took advantage of MH`s offer and bought Spectrafoo complete at a reduced price. I`ve been playing around with it, and among other things, I`ve made spectrograms of some of my LPs. Mostly out of curiosity about the HF content of vinyl vs. digital.
I got sidetracked right away by some of the strange spectrograms I found, because it seems to me that that digital recordings still keep their sonic signatures even after being transferred to vinyl. Maybe not a surprising find for you pros, but surprising for me at least.
But I am a complete amateur and newbie, so I was hoping that someone on this forum could explain to me what I am seeing:
1) Harry Belafonte at Carnegie Hall. RCA reissue, 180 g. vinyl. The strangest picture- some HF bands around 20 kHz on both channels. This is not an artifact, I kept the settings and made spectrograms of other recordings afterwards, and those bands weren`t there.
2) Jennifer Warnes, Famous Blue Raincoat, Sonet LP, bought by me in 1990. Bandlimited? If so, then why? 48kHz digital recording?
3) Jackson Browne, Running on empty All analog, I`m sure.
Thankful for any help.