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jrexiliusyesterday at 3:17 PM2 repliesview on HN

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


Replies

senshantoday at 12:22 AM

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.

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mercurywellstoday at 1:13 AM

How would this affect people with cochlear implants?