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Ultrasonic investigations in shopping centres

windytan.com

31–40 of 145 posts

Re: Ultrasonic investigations in shopping centres

#31

I live in Japan, Tokyo, and sometimes I come across these annoying/distracting high-pitched noises even in residential areas. They are a nuisance for bypassers too, if you've got ears young enough. But the residential areas don't have any problem with loitering youngsters, so I keep wondering if the noise is targeted against pests or wild animals. This article made me think if I should seriously start measuring the v…

Omnidirectional reference microphone would do the job.

Re: Ultrasonic investigations in shopping centres

#32
I had almost forgotten about the “Mosquito” devices for deterring youths that became ubiquitous in some areas during the late 2000’s and early 2010’s.

They were quite expensive and I know of a few people who got annoyed and specifically vandalised them due to the annoying sound.

Re: Ultrasonic investigations in shopping centres

#33

I had almost forgotten about the “Mosquito” devices for deterring youths that became ubiquitous in some areas during the late 2000’s and early 2010’s. They were quite expensive and I know of a few people who got annoyed and specifically vandalised them due to the annoying sound.

I'm glad those seem to have mostly faded away? The installation of them especially in spaces open to the general public has always struck me as deeply sick and antisocial

Re: Ultrasonic investigations in shopping centres

#35
post #33

I had almost forgotten about the “Mosquito” devices for deterring youths that became ubiquitous in some areas during the late 2000’s and early 2010’s. They were quite expensive and I know of a few people who got annoyed and specifically vandalised them due to the annoying sound.

I'm glad those seem to have mostly faded away? The installation of them especially in spaces open to the general public has always struck me as deeply sick and antisocial

There’s still a few around where I live, way less than before though and I think it’s old installations that somehow still function instead of “net new”.

What’s awfully irritating is that I can still hear them. I’m in my 30’s with pretty gnarly hearing damage, and can still hear that frequency range.

Re: Ultrasonic investigations in shopping centres

#36

Have you ever listened to a badly mixed song with a persistent high-pitched whine undercutting part (or all) of it? Certainly that's not on purpose either, but I doubt anystudio equipment is giving off an intentional "test" whine either, so I've always wondered how that ends up happening.

https://www.youtube.com/watch?v=QtbxWas-3oM

Re: Ultrasonic investigations in shopping centres

#37

Have you ever listened to a badly mixed song with a persistent high-pitched whine undercutting part (or all) of it? Certainly that's not on purpose either, but I doubt anystudio equipment is giving off an intentional "test" whine either, so I've always wondered how that ends up happening.

Sometimes it's old ears, sometimes it's the people in the room being oblivious to it from hearing it too much. I tell the story a lot about kind of the inverse of this - I was mixing my band's (terrible) recording, and during a weekend of mixing, I heard the squeak from my cheap kick pedal, like an icepick to the brain, piercing through the mix. I did my darnedest to EQ it out, and felt pretty good about it in the end.

On my Monday morning drive to work, I put on a CD by the band Cake, an album I'd listened to dozens, if not hundreds of times at this point, and would you believe that now, piercing through the mix, I heard the squeak of the drummer's kick pedal. Never noticed it before, but because I was so focused on those frequencies for two days straight, now it was all I could hear.

I switched to listening to purely electronic music that month, and I never noticed squeaky kick drums in studio recordings again.

Re: Ultrasonic investigations in shopping centres

#38

Have you ever listened to a badly mixed song with a persistent high-pitched whine undercutting part (or all) of it? Certainly that's not on purpose either, but I doubt anystudio equipment is giving off an intentional "test" whine either, so I've always wondered how that ends up happening.

I've noticed some FM stations have an odd metallic ringing noise in the background - especially country for some reason. I'm fairly certain it isn't intentional.

Re: Ultrasonic investigations in shopping centres

#40

Have you ever listened to a badly mixed song with a persistent high-pitched whine undercutting part (or all) of it? Certainly that's not on purpose either, but I doubt anystudio equipment is giving off an intentional "test" whine either, so I've always wondered how that ends up happening.

Whenever my daughter puts on recent pop music, I can tell instantly. Every pop song singer seems to have their voices artificially boosted into one or two higher harmonics. It's hard to describe in words but instead of the singer singing a single note, it's as if she (and it's very evident with female singers) has some very, very high pitched harmony automatically added, which lasts the whole song.

It's not like a single frequency buzz or carrier wave. It changes along with the pitch of the lyrics and clearly some kind of filtering they're doing to the voices. Either that or I'm paranoid and hearing things.

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