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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 2006-01-10, 11:29 PM
taygan taygan is offline
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DAT LP or lossy?

Here's a show that I was told is DAT LP. I've looked at it and think that might be right, it looks good in audacity, but not so good in EAC.

Sonic Studios mics > D7
MDAT>CDR

notes: DAT was switched into LP mode, so the whole show is uninterrupted from a 60M master.

Audacity 2 sec frequency:



Audactiy 2 sec spectrum:



EAC 2 sec frequency:



EAC 2 sec spectrum:




Thanks,
taygan.

Last edited by taygan; 2006-01-11 at 12:04 AM.
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  #2  
Old 2006-01-11, 02:10 AM
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Re: DAT LP or lossy?

can I get a yousendit.com sample from this show? 10-20 seconds would be great (or just a short track from the show).
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  #3  
Old 2006-01-12, 05:07 PM
Malth Malth is offline
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Re: DAT LP or lossy?

I assume LP means it was recorded at 32kHz?

If so, it seems to look fine, not like some mp3's that have a very sudden cutoff at around 16kHz
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Old 2006-01-12, 08:12 PM
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Re: DAT LP or lossy?

32kHz DAT cuts off at about 16kHz so looks about right. that crap you're seeing in the highs is because EAC is terrible at sa.

http://www.thetradersden.org/forums/...ead.php?t=4288

There is a little bit of noise up there, but I could only spot it when viewing in b&w. it does look a little blocky at the top and a little fuzzed (perhaps from analog transfer?). I can't spot any direct evidence that this is lossy.

would love to get some more opinions on this
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  #5  
Old 2006-01-12, 09:15 PM
taygan taygan is offline
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Re: DAT LP or lossy?

Could the noise be from the unknown conversion from 32kbps sampling to 44.1(?) for the cd generation?
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  #6  
Old 2006-01-12, 11:17 PM
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Re: DAT LP or lossy?

I would guess it is from the transfer from the DAT deck to an analog input with a nearly noise-free soundcard

I'm really out on a limb saying this stuff, of course

the main thing to understand is that the noise you see displayed in EAC SA is not as it appears, it is a mirroring effect.

if you look at the more accurate CEP SA it is 98% noise-free

you can really get to the bottom of this if it is possible to track down the taper
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  #7  
Old 2006-01-13, 01:04 AM
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ssamadhi97 ssamadhi97 is offline
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Re: DAT LP or lossy?

Quote:
Originally Posted by Five
would love to get some more opinions on this
Sure, if you hand over the sample...
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  #8  
Old 2006-01-13, 01:07 AM
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Re: DAT LP or lossy?

yeah that might help

http://s6.yousendit.com/d.aspx?id=1Q...E19VVPRL1S8YVH

http://download.yousendit.com/D7ACD840270952FA
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Quote:
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  #9  
Old 2006-01-13, 01:42 AM
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ssamadhi97 ssamadhi97 is offline
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Re: DAT LP or lossy?

So, looks like it's from 32kHz DAT all right. You even see the faint mirroring/aliasing effect at 16kHz caused by the resampling filter.

Gotta go now, picture later if I don't forget.
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  #10  
Old 2006-01-14, 01:41 PM
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ssamadhi97 ssamadhi97 is offline
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Re: DAT LP or lossy?

Here.

Note hawt vertical flipping action around 16kHz.

Typical side effect of resampling. Dig old threads for more info.
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