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rhinowing
2008-04-06, 12:57 AM
This is a 1993 FM broadcast from a silver disc. Obviously it doesn't go up to 19khz like I'd expect from an analog FM. Could it be 32khz DAT, a casualty of NR, or is it MP3?
http://img371.imageshack.us/img371/6519/930629er0.jpg

ameyer17
2008-04-06, 02:11 AM
You'd actually expect it to go to 15 kHz and for there to be a pilot tone at 19 kHz. I'd guess it's either 16 kHz DAT or mp3, and probably not a FM broadcast.
If you'll give me a second, I'll post a frequency analysis and a spectral analysis of something I pulled off FM a couple hours ago.

ameyer17
2008-04-06, 02:29 AM
OK, the spectral analysis and frequency analysis for a FM broadcast:
http://www.binaryhermit.org/pictures/FM-analysis.png

Five
2008-04-07, 05:23 PM
well the 1st post is lossy, look at those hypehn-looking blocks at the top and abrupt cutoff to black. more recent fm broadcasts look like this (because they're 99.9% lossy) but this one is from 1993... perhaps it is a re-broadcast? or maybe just mp3 or similar source.