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Author Topic: What should these frequency & spectrum analyses tell me?  (Read 1722 times)

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Offline Steve J

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What should these frequency & spectrum analyses tell me?
« on: January 09, 2006, 11:59:51 PM »
A question that popped up on another board from a non-taper (although he probably should be!  ;) ). Not quite sure what I'm looking at...other than a large frequency dropout. I figured I'd bring the question here.

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Converting these files to FLAC for personal archiving, I ran an analysis on the wav files. I got a kind of result I have never seen before. Can anyone offer an explanation for these graphs?





« Last Edit: January 10, 2006, 03:58:58 AM by Steve J »
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Offline mmedley.

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Re: What should these frequency & spectral analyses tell me?
« Reply #1 on: January 10, 2006, 12:09:31 AM »
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Offline Steve J

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Re: What should these frequency & spectral analyses tell me?
« Reply #2 on: January 10, 2006, 12:23:55 AM »
Having listened to other files from the same source (and knowing the quality of the sources frequently put out by a particular seeder), I highly suspected that they might be MP3-sourced files. And of course, if I'd just read a bit more. Thanks!

Now...altogether: "Hello? McFly?!"  :hmmm: :lol:
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Offline Steve J

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Re: What should these frequency & spectrum analyses tell me?
« Reply #3 on: January 10, 2006, 04:18:43 AM »
I posted back with that info; but it appears the real question is why there's no frequency response from about 8k to 16k with a "stripe" across at 16k. Has anyone seen this type of pattern? There was a suggestion that it might be caused by a problem with the sound card.

For grins, I went back and checked one of the other shows that were seeded. The files have that telltale dropoff at about 16k; but not the big hole in the frequency response. I can't begin to speculate how many generations this source has gone through, as the seed was supposedly created from a cassette transfer...which means somewhere along the line it went WAV>MP3>analog transfer to cassette, and then back again to WAV.  :bawling:
« Last Edit: January 10, 2006, 04:20:58 AM by Steve J »
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Re: What should these frequency & spectrum analyses tell me?
« Reply #4 on: January 13, 2006, 10:12:06 PM »
 shoulda read ::)
« Last Edit: January 14, 2006, 06:55:04 AM by Teddy »
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Offline Steve J

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Re: What should these frequency & spectrum analyses tell me?
« Reply #5 on: January 13, 2006, 10:42:03 PM »
No...it's actually a recording of a full band; but I'm sure that it was an MP3 a couple times in its life.
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