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Lossy or Lossless? Please use this forum to post spectral and frequency analysis posts about shows you have your doubts about.

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  #1  
Old 2006-02-03, 02:23 AM
taygan taygan is offline
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SBD? Um.. only if blocky spectrums are included.

Yeah, this one just came to me. Does everyone get these beauties or what?

Soundboard. Um, looks like a strange FM or something. Lossy except for the FM-like spikes, or am I making this all up? I guess the line at 16kHz could be at the venue..

Ideas?

Could it actually be a soundboard recorded as ?something?





And I must say I'm really enjoying learning this stuff from you folks. I've sent a number of people to this forum, and have walked a few folks through what I've gleaned.

Thanks.

taygan.
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  #2  
Old 2006-02-03, 07:14 PM
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Re: SBD? Um.. only if blocky spectrums are included.

looks like radio encoded to lossy sometime before it made it to FLAC. lots of static going on there. the carrier (or whatever) is broken up all over the place, so something happened to this recording (and then there's the visible blocks).
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Old 2006-02-03, 08:53 PM
taygan taygan is offline
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Re: SBD? Um.. only if blocky spectrums are included.

I was thinking radio encoded mp3, but the carrier seems low and there's no pops or clicks to explain the high spikes. I thought mp3 would wipe out those spikes.
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Old 2006-02-04, 12:48 AM
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Re: SBD? Um.. only if blocky spectrums are included.

the high spikes could be static introduced by cdr gens and/or bad extraction, certainly some kind of distortion. some other places it doesn't look like static... perhaps a post-lossy remastering effort?

the carrier does look kind of low, but whatever that steady sound is caused by something has happened to it or else it would be continuous.
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  #5  
Old 2006-02-05, 11:22 PM
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Re: SBD? Um.. only if blocky spectrums are included.

I'd guess the "spikes" are just caused by some kind of distortion (clipping?).

As for the tone you called "carrier", I suspect we're simply looking at some kind of TV source here (remember, horizontal scanning frequency is ~15750Hz for NTSC)
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Old 2006-02-07, 04:26 PM
taygan taygan is offline
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Re: SBD? Um.. only if blocky spectrums are included.

Quote:
Originally Posted by ssamadhi97
I'd guess the "spikes" are just caused by some kind of distortion (clipping?).

As for the tone you called "carrier", I suspect we're simply looking at some kind of TV source here (remember, horizontal scanning frequency is ~15750Hz for NTSC)
CLIPPING! yes, thank you. take a look at the spectrum matching the waveform where it would clip.

So, broadcast FM or PAL > WAV file? > encoded mp3 > WAV (recorded too high introducing clipping spikes) > flac.

I assume this is the progression, since the mp3 would remove the clips if they were in the original WAV file.






taygan.
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Old 2006-02-07, 05:27 PM
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Re: SBD? Um.. only if blocky spectrums are included.

Quote:
Originally Posted by taygan
So, broadcast FM or PAL > WAV file? > encoded mp3 > WAV (recorded too high introducing clipping spikes) > flac.

I assume this is the progression, since the mp3 would remove the clips if they were in the original WAV file.
Actually if the volume is not altered upon decoding, mp3 compression is actually much more likely to make a recording clip more.

Either way, mp3 encoding of a clipped broadcast recording seems to be what we're looking at.
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Old 2006-03-20, 11:52 PM
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Re: SBD? Um.. only if blocky spectrums are included.

Just curious, is this that pulled Neil Young 1-20-01 Rio De Janeiro show that is being discussed here? If not, that one sure looks similar.
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  #9  
Old 2006-03-20, 11:55 PM
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Re: SBD? Um.. only if blocky spectrums are included.

I guess not quite the same, since the carrier is not apparent but the clipping is there.
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Old 2006-03-21, 12:27 AM
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Re: SBD? Um.. only if blocky spectrums are included.

I was looking in this forum to see who "outed" that show, but I see it got busted in the original thread, sorry for the intrusion.
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