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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 2009-06-04, 08:33 AM
calvinist calvinist is offline
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Smile Is this source lossy or lossless?

I would really appreciate any advice about this show. It's supposed to be lossless but I have doubts.

Here are three spectral analyses and one frequency analysis:

http://www.flickr.com/photos/3426143...51394/sizes/o/

http://www.flickr.com/photos/3426143...44423/sizes/o/

http://www.flickr.com/photos/3426143...44551/sizes/o/

http://www.flickr.com/photos/3426143...44367/sizes/o/

Any help determining whether this is a lossy or lossless show would be greatly appreciated!
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  #2  
Old 2009-06-04, 10:02 AM
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Re: Is this source lossy or lossless?

I'm not an expert, but it all looks fine to me. No blocks in the SA and no sudden drop in the FA. What is it that you see that is making you wonder about it?
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Old 2009-06-04, 06:05 PM
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Re: Is this source lossy or lossless?

Looks good. No blocks in the SA, as Lynne said. Peaks all the way to 22K. FA runs clear to 22K as well, no steep drop-off.

I wonder why you would doubt it as well. This looks better than lots of other lossless shows.
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Old 2009-06-04, 06:11 PM
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Re: Is this source lossy or lossless?

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Originally Posted by U2Lynne View Post
I'm not an expert, but it all looks fine to me. No blocks in the SA and no sudden drop in the FA. What is it that you see that is making you wonder about it?
Thanks very much for your prompt reply!

This spectral analysis made me uneasy, because of the 'flattening' at 22 kHz:

http://www.flickr.com/photos/3426143...44423/sizes/o/
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Old 2009-06-04, 06:29 PM
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Re: Is this source lossy or lossless?

22K is the limit of human hearing (in reality, it's often much lower). So the software won't read above that usually. Also, microphones usually have a 22K cap, sometimes lower.
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Old 2009-06-05, 08:12 PM
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Re: Is this source lossy or lossless?

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Originally Posted by rspencer View Post
22K is the limit of human hearing (in reality, it's often much lower). So the software won't read above that usually. Also, microphones usually have a 22K cap, sometimes lower.
Wow, thanks for that useful info!

May I trouble you to assess the source of another show?

http://www.flickr.com/photos/3426143...08420/sizes/l/

http://www.flickr.com/photos/3426143...86763/sizes/l/

Is this the 'lego effect' that reveals a lossy source?

Thanks again!
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Old 2009-06-05, 09:05 PM
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Re: Is this source lossy or lossless?

Yes. That's it. Notice the steep drop on the FA as well.
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Old 2009-06-05, 09:38 PM
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Re: Is this source lossy or lossless?

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Originally Posted by rspencer View Post
Yes. That's it. Notice the steep drop on the FA as well.
Thanks again!

I was hoping the fact that it is an old 80s audience recording might account for the 'blocks'. I've tested two sources of the same show with the same result.

This is the original frequency analysis:

http://www.ead666.com/Temp/Out/1986-...Leicester.html
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