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Comment by jrexilius

20 hours ago

The original research project this company looks based on was very cool and way early: https://sandlab.cs.uchicago.edu/jammer/

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jrexilius

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senshan  11 hours ago

Thanks, very interesting. Basically the authors blast high-power (~92 dBA) ultrasound around 25kHz and hope that microphone non-linearities will overwhelm the audible signal.

This will sure make all the dogs in 20m radius mad. Hence the solution for the stealth recorder -- bring a dog, then complain about the ultrasound jammer (or at least to be aware of a jammer)

From the paper, it looks like the authors did not consider safety of animals, only human hearing safety.

  • ticulatedspline  9 hours ago

    As someone frequently annoyed by those stupid bird/deer/insect ultrasound emitters I hope this doesn't become common, with my luck I'll be able to hear them.

    • Der_Einzige  5 hours ago

      My neighborhood is full of these anti-social devices which are entirely designed to try to prevent dogs from shitting on their lawns. The noise they make is always at a pitch I can hear and my dog always ignores them.

      My dog has no problem shitting on their lawns, and even sometimes pees on the devices.

      So I'd like to find any actual devices which work on dogs (well I have no use for it but just to be sure they actually exist), because circa the original iphone I remember that there were apps which could reliably make its microphones do it (and impact dogs as expected).

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