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November 1st, 2011

This is the original clip* from where a mysterious sound appears. In spectral view you can see a "bar" of sound in high frequencies**. I isolated it and pitched it down. Here's the result:
http://www.freesound.org/people/bulbastre/sounds/132715/

What's the nature of this sound?
Comment there, please, or in the forum thread:
http://www.freesound.org/forum/dare-the-community/17385/

*There's actually two clips. In the first, about two minutes, the sound appears during a thunder. In the second, about 20, corresponds to the processed sound I posted first.

**You can't see it here, but when you check closely the whole two-hour original clip, you can see frequencies near the "bar" are a bit quieter when the bar appears. That means the fenomena consists not only of the "bar", but also of the frequencies nearby being silenced a bit. That could point to a problem of the recorder itself. Strangely enough, the recorder doesn't mishave in any other place.

Comments

  • avatar
    E_Dragon 2 years, 6 months ago

    To me it sounds like the high pitch of high power lines or transformer discharge arch, because of water grounding. Usually because of an cracked insulater. I say this because you're living in a city, they have HUGE power draws & LOTS of transformers. Hence the discharge, it doesn't mean that the discharge was some huge arch and spark show, but more like a discharge down a hairline crack resulting in a frequency the mike picked up.
    Just my thoughts on it....

  • avatar
    ruidostudios 2 years, 10 months ago

    I had an H1 and sometimes it made a soft noise, but I always thought it was from its own electronics, even after the A/D process, it was like an old cassette pumping/breathing but a very low level (very curious comparison), different from this one, it sounds like an AC whine to me from some kind of transformer/ballast, and it seems to be near.
    I like this time of strange noises all over the world, "The Hum" and so on, very appealing for us. Thanks, Bulbastre.

  • avatar
    Timbre 2 years, 11 months ago

    Isolated then demodulated here ... http://www.freesound.org/people/Timbre/sounds/132931/# IMO it's EMI something (like a fluorescent light) intermittently operating at below its correct voltage, unstable mains voltage as a result of the electrical storm.

    3 comments

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Type
Wave (.wav)
Duration
22:19:109
Filesize
490.4 MB
Samplerate
48000.0 Hz
Bitdepth
32 bit
Channels
Stereo
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