I have an issue with a sound recording I made with my Olympus LS-12.

The recorder is recording a constant unknown sound at about 10kHz. The sound is visible in the sonagram below as a faint dark band.

I uploaded a .wav file made with my Olympus LS-12 to Dropbox

Can anyone suggest what this noise is and how I can get rid of it? I've tried adjusting the gain of the recorder and recording away from my phone and computer, but this hasn't solved the problem.

enter image description here

I covered the microphones of the recorder with hands, to try to determine if the unknown sound is internal. This was the result:

enter image description here

  • $\begingroup$ "buzzing": this might be a language barrier, but to my understaning (I'm not a native English speaker myself) 10 kHz will definitely not sound "buzzing" but more "feeping" to the human ear. Go and use anything to create a 10 kHz tone. Are you sure this is what you hear? $\endgroup$ Jun 9 '16 at 20:44
  • $\begingroup$ and the vertical lines are broadband. Without knowing anything further about them, and with your time axis being far, far, to rough to say anything for sure, I'd assume they sound like white noise or more probable "clicks". $\endgroup$ Jun 9 '16 at 20:47
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    $\begingroup$ That recorder is high quality; you may have a defective one. Alternatives: the strange sound is actually present when you record; or the software you're using can't read 25 bit/sample data correctly. $\endgroup$
    – MBaz
    Jun 10 '16 at 1:50
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    $\begingroup$ Are there any other electronics, such as a CRT or anything with a power supply, battery or battery charger in the recording environment? $\endgroup$
    – hotpaw2
    Jun 10 '16 at 5:03
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    $\begingroup$ can we hear a piece of that audio please? $\endgroup$ Jun 10 '16 at 6:31

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