Hector Martin

(4) Just been told about this https://twitter.com/uosmedia/status/1167412086839947265?s=21 … Have not read it myself

(5) Ok I just read it. H sentences quoted from me were not, I am certain, following on from one another in the way it has been edited. So when I talk about permanent or temporary hearing loss, that it when I am talking about very high levels indeed at frequencies an individual..

(6) ..hear(which may be above 20 kHz if their hearing can achieve that). It is talking abut extreme levels you would not encounter in a public space so don’t be unduly alarmed. They levels you encounter will bring annoyance, anxiety, headaches (possibly as result of tensing...

(7)...neck muscles etc). Where I said if you can hear an ultrasonic frequency it will adversely affect you, that was in context of there being a narrowing window in amplitude as you do to higher frequencies, whereby the amplitude that is annoying is only a little louder than...

(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 …

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..