minus-squareayrco@slrpnk.netto196@lemmy.blahaj.zone•Is there any map/database of places with high frequency noise?linkfedilinkEnglisharrow-up3·edit-29 days agoThat reminds me of this blogpost: https://www.windytan.com/2024/06/ultrasonic-investigations-in-shopping.html (TL;DR: pilot tone from multi-loudspeaker PA system) linkfedilink
That reminds me of this blogpost: https://www.windytan.com/2024/06/ultrasonic-investigations-in-shopping.html
(TL;DR: pilot tone from multi-loudspeaker PA system)