19kHz at McDonald's #UltrasoundInAir
35°41'21.2"N 139°41'53.4"E
1-chōme-17-1 Nishishinjuku, Shinjuku City, Tōkyō-to 160-0023
https://goo.gl/maps/KAFByTP4f5h75rWB9 …pic.twitter.com/6tJ19CiJIP
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19kHz at BigBox Takadanobaba (North exit) #UltrasoundInAir
35°42'46.2"N 139°42'16.0"E
1-chōme-35-3 Takadanobaba, Shinjuku City, Tōkyō-to 169-8677
https://goo.gl/maps/dh2GoZ9wTY4NT4wbA …pic.twitter.com/D8bRLWMg5C
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Started an open map, anyone can contribute! https://drive.google.com/open?id=1kzKTd4LtuiczGnCZ029k8KSjJonWY8Rd&usp=sharing …
@Prof_Leighton#UltrasoundInAirShow this thread -
PIR activated emitter at a private residence in Sendagaya. Moving makes this one drift (!). Maybe some Doppler feedback effect?
#UltrasoundInAir 35°40'47.8"N 139°42'27.6"E 4-chōme-15-11 Sendagaya, Shibuya City, Tōkyō-to 151-0051 https://goo.gl/maps/FRrU72mt6ghjMdY58 …pic.twitter.com/RUPFpIjX5d
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what are you using to measure these? I hear them the odd time, its fucking deafening/disorienting.
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That's Spectroid
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This isn't signalling, it's supposed to be a rat deterrent. They blast it at >130dB SPL. It's messed up.
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