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We've got a dust mite ultrasound emitter to try and help with our youngest's allergy. It plugs in and emits an ultrasonic sound.
But I'm 100% certain i can 'hear' it, or certainly feel it. It goes on and I feel...out of sorts... almost as if there's a slight pressure right at the top of my spine and as a pressure in my inner ear.
I had it years back with a thing my father in law had to deter stray dogs. He used it to wind me up when we went out.
Anyone else get the same?
You are Batfink and I claim my five pounds.
Yes, neighbours a few houses down have a cat deterrent thing.
Cats dont give AF about it but it ruins my summer weekends in my garden because all I can hear is that high pitch sound every 20 seconds.
It's not even a sound i can hear as such - just a pressure
It’s not even a sound i can hear as such – just a pressure
sound is pressure...
Cats dont give AF about it but it ruins my summer weekends in my garden because all I can hear is that high pitch sound every 20 seconds.
I would be sneaking in to their garden when they're out and taking the battery out in that case!
Part Vulcan?
sound is pressure…
well yes, I know. You know what I mean though.
I would be sneaking in to their garden when they’re out and taking the battery out, So would I
I would be sneaking in to their garden when they’re out and taking the battery out in that case!
I wish I could but they have a huge fence around the perimeter and netting covering the entire back garden. Maybe to stop cats from getting in, maybe something more sinister going on in there, who knows?. I told them, well him, as I never see his partner only heard her occasionally, about it and they dont seeem to care either.
Cats dont give AF about it but it ruins my summer weekends in my garden because all I can hear is that high pitch sound every 20 seconds.
Find another garden to shit in?
I used to be able to hear certain parts of bats' echo location as a kid and used to hear plenty of stuff others couldn't (often from electronic devices); increasing age has put pay to that now but I still have good high pitch hearing (I wish that my eye sight was as good).
I told them, well him, as I never see his partner only heard her occasionally, about it and they dont seeem to care either.
doesnt surprise me. I wish areas could be designated as "only live here if you are actually a decent human being and act responsible and reasonable with respect to others". The rest can then live in their self-sustaining misery.
leaves you with the only route of going down the council noise complaint which just causes tension and probably wont resolve the matter anyway.
I have a similar problem with transformers in electronic devices. That is less of an issue these days with more solid state electronics and me getting older.
This thread's got me interested now, I'd forgotten about the bats!
14K is the first one I can hear here (I'm 51 by the way) - https://www.audiocheck.net/audiotests_frequencycheckhigh.php
Not sure of the frequency range of my PC speakers though.
There are loads of those cat scarer things near me. I can hear them as can the Mrs.
Shhhhhh...
...
.......
No, can’t hear nothing other than birds singing.
16k for me. While walking past a building site so quite impressed.
If you can hear it, it's configured incorrectly.
Ultrasonic deterrent devices should be WAY above our 20 kHz hearing range.
16 k for me too but I’m in a quiet office wearing earphones
I can quite often hear a bat's squeaks and the cat deterrent things
16 k for me too but I’m in a quiet office wearing earphones
But you're a panther
More like a Deaf Leopard
13 kHz for me 🙁 But on the plus side I can go for a walk in the woods at night without suffering bat noise!
15k for me (I'm 43) - that's what you get for not listening to your mother about loud headphones...
17khz but by crikey it comes in strong.
Everyone (well most of us) can hear those cat scare machines… because they are cheap useless tat, that don't function in the range claimed.
hearing frequencies depends on volume too. at a normal volume, I start hearing that at 16khz, but if you turn volume right up, to silly levels i can hear the 18khz one. at low volume I don't hear it until 12khz. As mentioned sound is pressure, so volume plays a big part.
Which is fine cause all the nice listening frequencies are below 10khz anyhow.
It's not just about how high you can hear either, you can have other ranges within the 20hz to 20khz affect. a 4khz dip is a common one.
just talking generally about frequencies here, not in relation to sound emitters for bed bugs!
After quick googling, seems these machines should be emitting at 40khz. which you definitely can't hear.
But, speculating...
If the equipment is poor, perhaps there is distortion on the sound causing some sub harmonics at 20khz and 10khz possibly?
Generally you shouldn't get subharmonics from a fundamental sine wave(you can get upper harmonic, but generally not lower, as well that's why it's called the fundamental!), but that's why i'm wondering if it's just poor equipment introducing distortion which could introduce subharmonics?
Anyhow, pure speculation there.
Yes. I remember being quite noticeably more sensitive to high frequencies in school experiments (22-23kHz or so). I've always suspected that my hearing is more "spread out" which explains why I often seem to have trouble making conversation out.
Going to uni open days, some little robots with ultrasound detectors were demonstrated at one and one of them was definitely just in what I could hear and very loud. I just remember a load of "Agh! Turn that one off, no that one!!!" with confused looks from the rest of the room.
Actually just realised I now own a sig-gen, I would be interested to measure what I can still hear these days.
Cats dont give AF about it
Well the cat(s) that was shitting on our front lawn obviously do co there's been no cat crap since I put 2 out.
So what Derek Starship said, setup wrong.
(all I can hear is tinnitus anyway)
I hear them. I can also hear filament light bulbs pop and those ****ing yoof deterrent things outside shops also drive me mad.
I thought the whole ultrasonics and insects thing was snake oil anyway?
Cat (or in our case rabbit) deterrent - we've a PIR sensor attached to a water jet, and the hose pipe obviously, when triggered it squirts pulses of water around a 120deg arc. Sold Stateside as a deer deterrent.
My hearing's crap, on that audio test I can hear the tone at 9kHz, I'm 59.
Part Vulcan?
Part Dust Mite?
we’ve a PIR sensor attached to a water jet, and the hose pipe obviously, when triggered it squirts pulses of water around a 120deg arc. Sold Stateside as a deer deterrent.
We got one of those to deter foxes from shitting on our vegetables. They just used it as a free water fountain. ****s.
Here's something else to chew on. A loud sound occurring after a quieter one can mask the quieter sound. You will only hear the louder sound.
It's a psychoacoustic effect due to how your brain processes sound.
We got one of those to deter foxes from shitting on our vegetables. They just used it as a free water fountain. ****.
Cunning stunts...
No music speakers are designed to be able to produce anything much over 25,000, basically because humans can't detect anything over that. Even in a best case scenario with ultra high end kit and biologically perfect ears.
In short, if you can hear or perceive it, it's not ultra high frequency and you've been sold a pup.
If I recall, I can only hear up to about 22 kHz which is quite good, but then my perception of the 'sound' is really small and i can only just hear it with pretty much zero background interference.
Introduce even the slightest bit of ambient noise and I can only hear up to about 20khz.
My hearing’s crap, on that audio test I can hear the tone at 9kHz, I’m 59.
Your audio equipment needs to be physically capable of generating that frequency though, and that's assuming the source is also physically capable too.
Someone near us has some sort of deterrent thing in their garden, I certainly hear/feel a clicking in the back of my skull when I go by. Bats too, often feel like I am hearing their squeaks, only when out side.
Yes. I'm in my early 30s and can hear those Mosquito things that shop owners put up to stop customers going in their shops.
@Mattyfez - tried a few sources and devices: 9kHz is audible; 9.5kHz is audible but noticeably quieter; 9.6kHz is inaudible.
I can hear something ultrasonic anyway, most likely the aliens, but listening to tht audio link,that stops, and it comes in at 11k for me. I'm 59 last year
Every few years I go for a medical which includes hearing test. Every time I am complimented on my hearing ability and the doctor doing the test gets all excited about it, as if it is something I have somehow managed to achieve off my own back. I can apparently pick up things at the extremes of human ability. I can hear all sorts of buzzing and high pitched things day to day that no one else seems to be able to. I didn't find out about this until well into adulthood, perhaps if I had known about it when in my youth, when your hearing is better, I could have done something useful with it.