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(8)..the amplitude at which you can just hear it (the amplitude difference between the two thresholds is much larger at lower frequencies). So all in all I would communicate a more contextualized message than CNN, with it’s limited space, edited up for me.
Thanks for the info! FWIW, the ones I'm talking about here are sold as rat deterrents, and claim to put out 19kHz at 136dB. They all all over Tokyo. I wrote a rather enthusiastic thread about them recently.https://twitter.com/marcan42/status/1162697281474142208?s=19 …
I can definitely hear the sound and it causes me physical distress (though not debilitating, it's not harmless either); I've also heard many stories of people being affected but not realizing that the cause is a sound. I'm worried about it actually causing lasting hearing damage.
It's insidious, because the inability to localize the sound, and not being used to sounds that high, make it difficult to immediately recognize it as such. I've been in places where something felt off but only upon getting close enough to the emitter did I realize what it was.
The paper https://royalsocietypublishing.org/doi/pdf/10.1098/rspa.2015.0624 … mentions research on Japanese pest deterrents in restraints etc on page 29-31 my colleague Dr Mari Ueda specifically takes measurements (base of page 30). If you confidentialLy DM your email address I will pass it on to her. Now to calibration..
I think you don't have DMs open to non-followees, but my email is public: marcan@marcan.st. Feel free to pass it on!
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"When sound becomes hostile"... 