The internet is filled with things. Here is one of them.
Ultrasonic investigations in shopping centres2024 Jun 10
Much has been written about the surveillance state we now live in, where one can now reasonably assume that if they are in any inhabitable location they are now being recorded on video. But less noted has been the emergence of universal loudspeakers – how every public social gathering place is under a layer of ubiquitous sound projection. The muzak is one thing, but did you know that these loudspeakers play constant and ambient broadcasts of tones outside the range of normal human hearing? I certainly did not. What is the purpose of these tones? What inadvertent physiological effects do they have on us? What about on animals? Why are we making these sounds in the first place?
Much has been written about the surveillance state we now live in, where one can now reasonably assume that if they are in any inhabitable location they are now being recorded on video. But less noted has been the emergence of universal loudspeakers – how every public social gathering place is under a layer of ubiquitous sound projection. The muzak is one thing, but did you know that these loudspeakers play constant and ambient broadcasts of tones outside the range of normal human hearing? I certainly did not. What is the purpose of these tones? What inadvertent physiological effects do they have on us? What about on animals? Why are we making these sounds in the first place?