Earlier quoted context omitted.
Not all cars do this, german car feature? (only VW's I've driven from 2000's onward seemed to have)
My Kia has it as well.
Mazda too
Ultrasonic investigations in shopping centres
101–110 of 145 posts
Re: Ultrasonic investigations in shopping centres
#102Earlier quoted context omitted.
One thing that can help is pressing the turn signal lever with less force than is needed to latch it. This should cause the indicator to flash three times and then stop. It’s an operating mode I wasn’t aware of for decades.
Not all cars do this, german car feature? (only VW's I've driven from 2000's onward seemed to have)
I've had this feature in Chrysler, Ford, Honda, and Hyundai cars ranging in year from 1995 to 2021.
Re: Ultrasonic investigations in shopping centres
#103Earlier quoted context omitted.
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 si…
The other comment is right that autotune is almost always present in recent pop vocals - even when the singer is excellent, a little bit is now commonly added to give it that certain sound. Having said that, I think what you might be hearing is actually another modern trend - which is just boosting the high frequencies in the vocal a lot. Pop vocals right now are mixed very 'bright', sometimes almost painfully so. Al…
> autotune is almost always present in recent pop vocals
Autotune is often present in almost any decently-high budget studio recording of loads of different genres. Its just not obvious.
Autotune doesn't need to sound like Cher in Believe or T-Pain in any song he sings or Kesha. They're just cranking some of the settings to make those super obvious artifacts. When a sound engineer uses autotune (or the many other similar effects) you wouldn't even notice its there.
Speaking as someone who moonlights doing live music production, autotune is used loads of places.
When Cher's Believe came out, autotune had been a thing for several years. Its just that most people thought people didn't like speed == 0 until Cher made it a thing.
Re: Ultrasonic investigations in shopping centres
#104Very interesting. I can remember being able to hear a high pitched tone when I was 4-6 shopping with my mother in department stores that seemed to get louder when we approached flush mounted speakers in the ceiling. This article measures the frequencies and explains it's a normally operating feature of the systems.
Going into Sears used to drive me nuts. My parents finally accepted that I was actually hearing something that they couldn’t, but it took a while. I don’t know if it was the loss prevention system that was doing it, or what. All I could do was localize it down to being anywhere remotely close to the entrances. And the closer you got, the louder it got. These days, my tinnitus is constantly ringing at about that same…
Could have been the pulse frequency of old magnetostriction loss prevention rfid tags.
The tone is not meant to be audio, but might be inadvertently emitted by the electronics.
Re: Ultrasonic investigations in shopping centres
#105Earlier quoted context omitted.
I'm not sure I ever managed to hear a 19kHz tone, but I'd say it might have been possible (or the tone was a lower frequency one). But yes the old CRT whine I could definitely hear
I've been tested to 22+kHz, autistic, and older. It was the worst era. Some of the awful roars of noise I've heard while older people called me a weirdo. CRTs, early checkout scanners, some audio systems. And back when "as seen on TV" electronic dog whistle trainers were all the rage? Torture.
A few years ago I went to the beach. The place I was staying at had a CRT television. I tried to use it once. I have no idea if something was wrong with it, but it was loud enough to cause pain. Once I turned it off, everything was quiet again and the pain was gone.
Re: Ultrasonic investigations in shopping centres
#106No mention of how bad this must be for dogs and other animals that can hear better than humans.
LED bulbs must drive them crazy. Many emit ultrasounds that I can hear when I'm next to such bulbs, like that of a vibrating capacitor (low quality AC filtering, low quality capacitor, or both).
Re: Ultrasonic investigations in shopping centres
#107Earlier quoted context omitted.
even a headphone plugged in wrong is a good enough sensor to start. when it gets bad you start looking at designing your own ribbon elements and considering active pickups. when it gets worse you may find yourself deeply concerned about ADC and clock skew.
It doesn't matter what your microphone can do, because your sound card does the filtering and digitization.
And many modern sound card IC sample at an effective rate of 192kHz and use internal DSP to downsample that to the requested sample rate.
Much easier to design a good low pass filter on the cheap when your Nyquist frequency is on 96kHz instead of 22kHz.
So the frontend of the sound card might actually be remarkably wide.
Re: Ultrasonic investigations in shopping centres
#108Earlier quoted context omitted.
I wonder how much of this sound pollution disproportionately affects autistic people. We need to make our soundscapes accessible.
Or the idea that the humans are just blissfully unaware while their 'hyper' cat/dog is stuck inside a home with some device screaming 24/7, LED lights flashing, etc.
That’s … a horrible thought.
How does one get a 19khz microphone to check I guess?
Re: Ultrasonic investigations in shopping centres
#109What does the author use to measure sound and create those graphs? I'm interested in automatically monitoring an annoying noise that's coming from a neighbour.
Re: Ultrasonic investigations in shopping centres
#110Earlier quoted context omitted.
I wonder how much of this sound pollution disproportionately affects autistic people. We need to make our soundscapes accessible.
Or the idea that the humans are just blissfully unaware while their 'hyper' cat/dog is stuck inside a home with some device screaming 24/7, LED lights flashing, etc.
My ex got a device to discourage ants. Then forgot where she placed them. Then found out that it was in my daughter's hearing range.
Finding the last one was a nightmare.
Here is the device.
https://www.amazon.com/Ultrasonic-Repeller-Electronic-Repell...
It was