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Topic: Need help in verifying the legitimacy of a spectrogram (Read 3393 times) previous topic - next topic
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Need help in verifying the legitimacy of a spectrogram

Hi guys, I've finally got my hands on the leaked album 9 Beats from Ratatat. This album as never been sold and was leaked in MP3 V0 back in the days. It's not clear if few promo CDs would have been in circulation. Well I just got a rip from a guy who got it from someone who pretend he have the promo CD.

As of now I haven't got pictures as a proof of possession so I can only rely on the log file and the spectrogram analysis. The log looks legit to me but the spectrogram seems suspicious as the top part going in the 15-22k range looks like a mirror from the bottom. I've never seen that before and to be honest I'm not at all a pro in this domain. Can someone please analyse the specs and the log file and tell me if this is a true flac rip?

Spectrogram of all songs : https://imgur.com/a/IncGr
Log file : https://www.dropbox.com/s/hnf8rbfyvikmsfv/Ratatat%20-%209%20Beats.log?dl=0

Thanks a lot, just registered but have read on here for years!

Re: Need help in verifying the legitimacy of a spectrogram

Reply #1 –
Quote from: G22 on
Can someone please analyse the specs and the log file and tell me if this is a true flac rip?
No one can do this as we don't know the "chain of custody" for these rips nor do we know whether they have been legally obtained.  The whole "got a rip from a guy who got it from someone" provenance is very sketchy.  The log looks like a legit EAC log for something.  No CD I've ever ripped has had that much content above 15k but I don't listen to this genre so I really don't know.

Re: Need help in verifying the legitimacy of a spectrogram

Reply #2 –
Well any flac should have stuff above 15k and it should have data up to 22k.

I don't understand why nobody can tell. Well someone knowing how to read spectro should be able to tell if it's good or not.

Re: Need help in verifying the legitimacy of a spectrogram

Reply #3 –
Quote from: G22 on
Well any flac should have stuff above 15k and it should have data up to 22k.

No way.  Lots of CDs are low pass filtered.

Quote from: G22 on
I don't understand why nobody can tell. Well someone knowing how to read spectro should be able to tell if it's good or not.

To me it looks like the recording has some aliasing, and that it was probably recorded at 48k then resampled to 44.1k for CD playback.  I have no idea if that makes it "good or not".  Not sure how you expect to find that out from the spectrogram either. 

Re: Need help in verifying the legitimacy of a spectrogram

Reply #4 –
Even if it were leaked by the artist, it could have been from a lossy source. But maybe someone can tell from this picture whether the blue-ish tint indicates that it was a pressed CD rather than a CD-R? http://web.archive.org/web/20121029074731/http://www.banagale.com/blog/images/music/ratatat_9_beats_cd_scan_large.jpg

Re: Need help in verifying the legitimacy of a spectrogram

Reply #5 –
Thanks guys!  :)