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Artifacts in recordings?

Subject: Artifacts in recordings?
From: "froggologist" froggologist
Date: Sat Sep 22, 2012 9:54 am ((PDT))
Hello everyone!

I am new to this forum, i have looked around the topics, but have not found=
 the answer to my problem, so here it is:

I got these recordings from other people i am collaborating with, and i don=
't know exactly the recording equipment or the recording conditions (like m=
ic-animal distance for example). I get 2 types of odd things in the recordi=
ngs i suspect are artifacts:

    - very asymetric oscillogram, and a "smir" on the spectrogram, above an=
d under the frequency band

    - a less marked "smir" in the spectrogram, only above the DF, but going=
 all the way to the max frequency of the recording, and extra harmonics

The second case looks a bit like what i get with a saturation, but none of =
those recordings are saturated. I thought, the second case might be a "near=
 effect"? if the person put a recorder simply too close from the source. Ho=
wever, for the first case, i just dont know!! In addition those recordings =
are from species i have not necessarely worked with before, so i can't real=
ly tell what should be a "normal" spectrogram for those species....

Does anyone of you have an idea of what it may be? And whether i can still =
use these recordings in some way?

Thank you!

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