View Full Version : FM compression or .mp3 ?
alchemy71085
2005-10-05, 04:17 PM
I'm usually pretty good at spotting .mp3 sourced material, even in the rare case when it doesn't stick out like a sore thumb, but I always love second opinions. The attached is from FM, but what do you think?
looks like fm to me
would love to see a spectral zoomed to 2 seconds if possible
ffooky
2005-10-05, 05:44 PM
Spike at 17 KHz ? Halfway between TV and FM ? There's a spikelet at 15.5 KHz so I'm going for a TV source.
alchemy71085
2005-10-05, 06:01 PM
OK, thank you, but the disks have FM intros and outros so I know it's FM.
I'm just trying to make sure it's not .mp3 sourced, because I need it for an upcoming project.
The recording is Dire Straits - live in Houston from August 17th, 1985.
Although, who knows, could be one of those TV simulcasts without video, but I don't think so.
Spike at 17 KHz ? Halfway between TV and FM ? There's a spikelet at 15.5 KHz so I'm going for a TV source.
jcrab66
2005-10-05, 06:33 PM
the problem with ALOT of US radio stations today is that they take live programs that are sent to them on disc for broadcast then load them in their machines as Mp3's and broadcast them that way, could be an Mp3 source that was broadcast over the airwaves...
alchemy71085
2005-10-05, 06:41 PM
Yes, I know, but not from 1985.
Unless there is something I should know about :hmm:
To be honest, I wish there were more live concert broadcasts. It seems that they are thing of the past these days. :mad:
Come to think of it, I haven't heard any in a long time.
the problem with ALOT of US radio stations today is that they take live programs that are sent to them on disc for broadcast then load them in their machines as Mp3's and broadcast them that way, could be an Mp3 source that was broadcast over the airwaves...
alchemy71085
2005-10-05, 06:48 PM
Here is the screenshot you needed Five. Hope I did that correctly.
The show is from a radio station out of Canada(?) called "SHAY 106", but considering it was broadcast in 1986, I doubt it still exists. The show was called "Saturday's at Seven".
Thanks.
looks like fm to me
would love to see a spectral zoomed to 2 seconds if possible
hmm... pretty fuzzy
can you get me a sample of this? 5-10 seconds, post a flac to rapidshare.de? I'd be interested to have a closer look. still looks like fm from what I can see.
alchemy71085
2005-10-06, 01:57 PM
A fifteen second sample from Sultans of Swing can be found here. (http://www.studentpersonalpages.loyola.edu/~dgmolda/SOSsample.flac)
Thanks.
hmm... pretty fuzzy
can you get me a sample of this? 5-10 seconds, post a flac to rapidshare.de? I'd be interested to have a closer look. still looks like fm from what I can see.
ffooky
2005-10-06, 02:22 PM
100% certifiably, absolutely, positively lossless.
the sample doesn't resemble the screenshots posted above :hmm:
very low levels, tons of noise... can't see the carrier
anyhow it looks & sounds lossless to me
http://img249.imageshack.us/img249/7170/sossa11cx.th.png (http://img249.imageshack.us/my.php?image=sossa11cx.png) http://img10.imageshack.us/img10/6020/sossa25ia.th.png (http://img10.imageshack.us/my.php?image=sossa25ia.png) http://img10.imageshack.us/img10/9307/soswav19uj.th.png (http://img10.imageshack.us/my.php?image=soswav19uj.png)
alchemy71085
2005-10-06, 04:33 PM
The sample was from Sultans of Swing.
The freq analysis and spectral views above are from a differnet song on the same recording.
I didn't think it mattered as it's all from the same source.
Well yea, I agree, the levels are very low. But I didn't do the mastering on this one.
the sample doesn't resemble the screenshots posted above :hmm:
very low levels, tons of noise... can't see the carrier
anyhow it looks & sounds lossless to me
http://img249.imageshack.us/img249/7170/sossa11cx.th.png (http://img249.imageshack.us/my.php?image=sossa11cx.png) http://img10.imageshack.us/img10/6020/sossa25ia.th.png (http://img10.imageshack.us/my.php?image=sossa25ia.png) http://img10.imageshack.us/img10/9307/soswav19uj.th.png (http://img10.imageshack.us/my.php?image=soswav19uj.png)
ffooky
2005-10-07, 05:45 AM
Is this track noticeably hissier than the one you posted csrrenshots of at first ?
alchemy71085
2005-10-07, 11:18 AM
No, they all have equal hiss levels, from what I've seen and heard.
Is this track noticeably hissier than the one you posted csrrenshots of at first ?
ffooky
2005-10-07, 01:31 PM
No, they all have equal hiss levels, from what I've seen and heard.
That makes the difference between the screenshots one and the sample even wierder. Any chance of a sample of the first track ?
alchemy71085
2005-10-07, 04:27 PM
Gee thanks for look into this...
Here (http://www.studentpersonalpages.loyola.edu/~dgmolda/MFNsample.flac) is a sample from Money for Nothing. That was the original song I sent the screenshots in of.
That makes the difference between the screenshots one and the sample even wierder. Any chance of a sample of the first track ?
paddington
2005-10-07, 05:33 PM
Hi guys.
I think what he has here is FM broadcast, with the tape possibly running slow during playback. FM stereo pilot is 19kHz and this is lower, so I'm thinking the playback is slowed, resulting in a lower freq?
The odd thing is, FM's high range is 15kHz (unless it's IBOC digital "HD Radio" which is 20-20k) and this cuts off mostly at 15kHz... so the slower tape thing doesn't make any sense there.
ffooky
2005-10-07, 05:42 PM
Gee thanks for look into this...
Here (http://www.studentpersonalpages.loyola.edu/~dgmolda/MFNsample.flac) is a sample from Money for Nothing. That was the original song I sent the screenshots in of.
Well that looks exactly the same as the other sample but, in Audacity at least, it looks nothing like the original screenshots, though there is a barely perceptible spike at 17KHz. The differences between the way analyses appear in the different programs really does seem terribly confusing.
ssamadhi97
2005-10-07, 06:22 PM
Gee thanks for look into this...
Here (http://www.studentpersonalpages.loyola.edu/~dgmolda/MFNsample.flac) is a sample from Money for Nothing. That was the original song I sent the screenshots in of.
You sure you didn't mess something up when initially posting pics? The clips you made available are definitely from a completely different source than the pics in your original post.
alchemy71085
2005-10-07, 09:26 PM
Nope, I'm positive...it's all from the same thing. I took the two spectral views with Adobe Audition. The first shots at the beginning of this thread are from MFN, and the samples are the samples as marked.
You sure you didn't mess something up when initially posting pics? The clips you made available are definitely from a completely different source than the pics in your original post.
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