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A Tokyo park has started playing a high-pitched tone at night that only young people can hear to help drive away teenagers who keep vandalizing the toilets and other facilities
While such devices are used at some convenience stores in Japan also troubled by teens, Masuda said district officials were hesitant at first.
"We were a little worried about whether the local government should be using such a device to exclude certain people, even if these are young people that are causing problems," Masuda said.
Originally posted by ADVISOR
I can only hear the 8khz, every thing else is silent to me. What freqs do the rest of you hear, are there any you can not hear?
Originally posted by ADVISOR
I can only hear the 8khz, every thing else is silent to me. What freqs do the rest of you hear, are there any you can not hear?
Guess those IEDs in Iraq and rock n roll from the 80s did more damage than I imagined. Hmmm, which is worse, rock n roll or IEDs.....
On the other hand small children and infants are especially at risk, due to lengthy exposure to the sound, because the adults themselves do not perceive the noise. Moreover, the ultrasound affects not only hearing. Disruption of the equilibrium senses, as well as other extra-aural effects are well known. With the sound levels that can be reached by the device, the onset of dizziness, headache, nausea and impairment is to be expected. This is not the limit of the total risks to safety and health
Originally posted by ADVISOR
I can only hear the 8khz, every thing else is silent to me. What freqs do the rest of you hear, are there any you can not hear?
Guess those IEDs in Iraq and rock n roll from the 80s did more damage than I imagined. Hmmm, which is worse, rock n roll or IEDs.....
Originally posted by WickettheRabbit
I think I actually saw this on Facebook. I can hear up to 17KHz, but not 17.4, which is good for me, since I'm over 30.
Thanks for the hearing test.