11 ms·

I'm just glad they identified the source of the hum, many people are impacted for years by unexplainable sounds, and it is maddening. It took me and my neighbo

I'm just glad they identified the source of the hum, many people are impacted for years by unexplainable sounds, and it is maddening. It took me and my neighbours a month to find the source of a hum that was resonating with our windows. It was torture, with midnight walks and lurking around potential sources, mapping nearby industrial sites, and questioning our sanity, while our windows were vibrating without a stop. We were very lucky to track it down to a badly installed air conditioning vent 200 m away. https://en.wikipedia.org/wiki/The_Hum https://en.wikipedia.org/wiki/The_Hum

dustym 6y ago
Two unrelated anecdotes: 1. A few years ago I spent some time in Falmouth, MA and there was an ongoing battle over newly installed wind turbines. The humming sound was getting to people, including to the point where they were getting headaches. Some people heard it and others didn't. The locals were going to war with the initiative. This article reminded me of that and I checked in on the ordeal. Looks like they shuttered the project and have started dismantling the turbines. It seems like a total failure: https://www.wsj.com/articles/a-green-new-deal-in-profile-11549325968 https://www.wsj.com/articles/a-green-new-deal-in-profile-115... 2. I was on a solo canoe trip in a remote part of Maine a couple of weekends ago and I kept hearing the sound of a motor start up and then die down. I heard it multiple times along a 25 or so mile stretch of water with the only other sounds being birds, moose rumbling in the woods, and beavers slapping the water with their tails. I chalked the sound up to some wind turbines I had seen on my drive up there and felt justifiably annoyed at the encroachment of the industrial world into my backwoods trip. I did some research when I got home and it turned out that I was hearing ruffed grouse "drumming" to mark their territory. In retrospect, it's an amazing sound: https://youtu.be/q0obByQW23k?t=21 https://youtu.be/q0obByQW23k?t=21
- Wowfunhappy 6y ago
  Geez, I'm torn on number one, since obviously locals should be able to live in peace, but the world is in such incredibly dire need of clean energy. Surely this was an issue with these specific turbines, right? Not a problem with all of them?
  - klohto 6y ago
    Anecdotal evidence, but I have the same experience as well. I’m not from US, so I will assume it’s a different type of turbine. Wind turbines were installed near our village and my family started hearing sounds and feeling vibrations. I didn’t hear and don’t hear them when I return there, but it forced my parents to leave their home. It’s a horrible feeling, especially since people don’t believe you. It can hardly be measured, because people with the correct equipment don’t pay attention to you and other people think you’re crazy. Actually, if anybody has more information on how would I go around fixing this issue or which party should I raise this with, I would welcome that. It’s been more than a decade but the turbine is still there even though affected people have moved out.
    - technicaldonut 6y ago
      That's actually a scientifically recorded fact. German researches recorded the sleep patterns of 397 residents in areas where there was previously no mobile reception. After erecting 10 towers, many people complained about a change in sleep patterns. 5 of the 10 towers were turned off though so had no actual effect. Just the believe was enough to cause problems. [0] [0] https://pubmed.ncbi.nlm.nih.gov/20737608/ https://pubmed.ncbi.nlm.nih.gov/20737608/
      - oliveshell 6y ago
        Well, it could have been unrelated to radio emissions: resonant sounds caused by wind blowing through the tall towers, for example.
  - fragmede 6y ago
    Low-grade humming is exhausting anyway. That's one of the reasons people are so tired after a long plane flight, despite just sitting there. Giant stationary installations with very loud noises tend to cause weird noise issues. It's a lot of unfocused, or weirdly focused sonic energy that can't be heard from a little further away, but at exactly the right (well, wrong) place, it can get re-focused, leading to a droning noise that starts and stops unexpectedly. A good example that shows this phenomenon is real, despite being invisible is the Listening Vessels[0] exhibit at the Exploratorium or similar, with two giant parabolic sound reflectors. For the wind farm, the issue isn't just turbines, but that specific turbine, down to the serial number and the serial number plate, at that exact location, temperature, humidity, causing a resonance in a specific resident's door, miles away. The resident may be able to replace, eg, the door, but often there are factors outside of the resident's control that contribute to the issue. Like the siding on the neighbor's house, or where their car is parked. Ideally an acoustical consultant would be brought in during the design stage (just like SREs should be brought in during the design phase of a new service and not 5 minutes before it goes live), but that almost never happens, as we see (well hear) here. At least in this case the noise can be heard by everybody. Imagine this noise coming off the bridge, but it's only audible from your bedroom Tuesdays when its cloudy. And none of your neighbors can hear it. You'd think you'd gone mad! [0] https://www.exploratorium.edu/exhibits/listening-vessels https://www.exploratorium.edu/exhibits/listening-vessels
- dylan604 6y ago
  2) It's amazing how perspective changes with more information. It is very odd how much that sounds just like a mower having difficulty starting, and is exactly the conclusion I would have jumped to it being. Glad you were able to get a better answer.
  - dustym 6y ago
    Yeah, I thought it was a generator or mower at first. It's just quiet enough that I mistook it for a much louder sound that had grown faint due to my distance from the source.
  - chubot 6y ago
    Are the birds imitating sounds they heard in the forest? Mimicry is a powerful thing
    - dylan604 6y ago
      I went deeper down the rabbit hole, and it is their mating call / territorial signal. The drumming sound is actually created from a vacuum effect caused by the particular movement of their wings. https://www.youtube.com/watch?v=vERkh23mp64 https://www.youtube.com/watch?v=vERkh23mp64
    - tejtm 6y ago
      It's a mating call that predates combustion engines most likely by millennia(s)
      - dylan604 6y ago
        I wonder how long Poly has wanted a cracker
        tejtm 6y ago
        Two billion years give or take
- blackguardx 6y ago
  I think the complaints about Falmouth wind turbine noise are eerily similar to complaints that wifi gives people headaches. I don’t think they are founded in reality.
  - brendoelfrendo 6y ago
    My parents lived up that way, and the amount of NIMBY-ism regarding offshore turbines is staggering. I suspect you may be right, and people just latched onto whatever claim got the turbines shut down.
    - Drdrdrq 6y ago
      It is also possible that they generate the sound of the same frequency, but coming from multiple sources it can compound in some areas to be louder than elsewhere - and those areas could change with the direction of the wind. This is purely speculation from my side of course, as I've never been there.
      - DagAgren 6y ago
        No, it's a pretty safe bet that any of these complaints about wind turbines is just NIMBYism. It happens every single time.
  - deleted 6y ago
    [deleted]
  - mandelbrotwurst 6y ago
    How are those similar? What about this story leads you believe that these people are claiming to be hearing frequencies outside of those known by science to be audible to humans?
- yread 6y ago
  Your description reminded me of a similar sound on my first night on anchor with my first chartered yacht. Turns out it was a fan in our inverter that was somehow switched on and it completely drained both our batteries (wrong installation) overnight so we couldn't lift the anchor nor start the engine in the morning
  - forgotmyp77 6y ago
    how did you get out of that one?
    - alias_neo 6y ago
      Use the sails and lift the anchor manually? (I'm guessing, don't have a yacht).
      - Drdrdrq 6y ago
        You would have trouble landing without the engine though. Better not to risk it if there's no problem with being anchored there, and just waiting for the fix.
        yread 6y ago
        It's possible - I did the RYA training which describes the theory of it and we even involuntarily attempted it in practicals (gearbox broke and it wouldn't go forward). But it's definitely not easy. In the end we hit a spot in the marina with absolutely no wind and had to swallow our seamanship pride and back up there
        alias_neo 6y ago
        I forgot about the part where you would have a phone and can call for help! Why is the landing part hard, is it about maneuvering and slowing?
        Drdrdrq 6y ago
- mprovost 6y ago
  Just across Buzzards Bay from Falmouth was the original Marconi transmitting station for transatlantic communication to a receiver in Norway. My great-grandfather helped build it in 1914! At the time it was the most powerful transmitter in the world at 300 kW. There were 14 440-foot towers in a grid, and it was so powerful that apparently anywhere in town you would get zapped while hanging out the laundry on a clothesline, and you couldn't get a TV signal in town until the towers stopped operating. To avoid interference the receiver had to be located 40 miles away in Chatham.
  - dustym 6y ago
    Very interesting. Maine also has a significant transmitter array in Cutler with 30 or so antennas around 900 ft tall apiece. https://en.wikipedia.org/wiki/VLF_Transmitter_Cutler https://en.wikipedia.org/wiki/VLF_Transmitter_Cutler I wonder what it's like to try to pull a signal up there. Your comment brings up memories of Lighthouse Beach in Chatham, which has a ton of warnings about Great White Sharks due to the prevalence of seals in the waters. Beautiful place. If the sharks don't get you the radio frequencies will I guess.
    - mprovost 6y ago
      Just further up the coast is Marconi Beach in the Cape Cod National Seashore - same sharks.
    - jimmyswimmy 6y ago
      Picking up TV and other RF signals near there should not be a problem. Modern transmitters are much different than in Marconi's time. Then they used a spark gap to generate RF, which have a DC to daylight kind of output that GP described. Much like a bad ground on a car ignition system can make a lot of RF noise that really gets around, a spark gap transmitter puts out a signal EVERYWHERE. Which is why it affected so much. Modern transmitters are tuned and filtered so they can coexist with everything else.
- mike_red5hift 6y ago
  RE: #2. I remember the first time I heard that sound when I moved from the city to the woods of NH. I thought someone was trying to crank up some kind of motor, too. Then I eventually caught a glimpse of a ruffed grouse doing its thing. Neat.
- rasz 6y ago
  1 Modern CFD techniques enable almost silent blades. If a $10 computer fan can have special dimples/channels why cant wind turbines https://www.quietpc.com/nf-a12x25-5v https://www.quietpc.com/nf-a12x25-5v https://cougargaming.com/us/products/cooling/cfd_red_led_fan/ https://cougargaming.com/us/products/cooling/cfd_red_led_fan... https://aerocool.io/us/product/silent-master-blue-20cm/ https://aerocool.io/us/product/silent-master-blue-20cm/
  - deleted 6y ago
    [deleted]
  - close04 6y ago
    Well... size matters. The tip of a wind turbine blade moves much faster (~25m/s, up to 80m/s in the biggest ones) than the tip of a silent computer fan (~5-6m/s, up to ~10m/s in the faster ones). You can make the blades more silent but there's a limit to what you can do when your blades move that fast and are up to 75m long. And any solution that reduces efficiency is probably a no go for manufacturers and operators. From your links you can see that a 140mm computer fan at 1000RPM is noisier than a 120mm fan at 1200RPM. Even if the motor is quieter at the lower RPM, increasing the blade size is more than able to compensate and make it overall noisier, even with dimples and owl-wing tricks. And it's not only the decibels that are the issue necessarily but also the frequencies which can propagate quite far and by all accounts are pretty disturbing. That low frequency hum that the blades produce by simply displacing air while they move is not a problem with a computer fan's tiny blades. And turbines come in farms.
  - jungletime 6y ago
    Experiment! How Does An Owl Fly So Silently? https://www.youtube.com/watch?v=d_FEaFgJyfA https://www.youtube.com/watch?v=d_FEaFgJyfA
  - metalliqaz 6y ago
    Fans are not turbines. You understand that, right?
- adtechperson 6y ago
  That ruffed grouse video is great but does not really do justice to how startling that sound can be. Imagine walking through the woods, no one around, and all of a sudden it sounds like a lawn mower starting up very close to you. It is unbelievably startling, even if you know what it is.
  - alias_neo 6y ago
    As a horror film fan, I was thinking combustion powered chainsaw.
    - emmelaich 6y ago
      The lyrebird can imitate a chainsaw -- among many other things. This is from the BBC's Life on Earth. https://www.youtube.com/watch?v=VjE0Kdfos4Y https://www.youtube.com/watch?v=VjE0Kdfos4Y
      - sah2ed 6y ago
        That’s amazing, thanks for the share! I’m one of today’s lucky 10,000.
        emmelaich 6y ago
        Excellent! I thought everyone had seen this, indeed. Don't fall for the parody though ... https://www.youtube.com/watch?v=KOFy8QkNWWs https://www.youtube.com/watch?v=KOFy8QkNWWs
        twic 6y ago
        Nor this apparent imitation of the clearly inimitable Big Shaq: https://www.youtube.com/watch?v=jzT_TtrVcRk https://www.youtube.com/watch?v=jzT_TtrVcRk
      - alias_neo 6y ago
        Wow thanks. The camera shutter and car alarm were something but that chain saw sound is incredible.
- tomcam 6y ago
  OK that grouse sound is very trippy considering the context. I would’ve been in the exact same mindset as you. Thank you for sharing.
- rconti 6y ago
  1. didn't feel like something that needed to be editorialized, but I guess WSJ disagrees.
- gwright 6y ago
  So funny to hear your story about your canoe trip. When I hiked the AT in 2002, I spent the first several days having the same experience you had. I thought I was hearing things, then I thought I was much closer to civilization that I expected and hearing lawn mowers, finally talked to other hikers and got the story. I found my trail journal entry about this: https://www.trailjournals.com/journal/entry/14113 https://www.trailjournals.com/journal/entry/14113
- joebergeron 6y ago
  1. Very funny to be reading this. I grew up in Falmouth, and lived there until 2014 when I graduated highschool. I obviously wasn't incredibly attuned to this issue, but as I recall, the only people opposed to the installation of the turbines were a very small, very vocal, and very, very, wealthy minority of people who owned mind-bogglingly expensive beach houses and lived there two months out of the year. I'm fairly certain a lot of the more reasonable-sounding complaints they threw at the project were simply cover-up for their real gripe, that the turbines ruined their view over the bay. I recall an unintentionally hilarious piece of mockup art that was drafted up, comparing the horizon over the water with and without turbines, side by side. They were barely distinguishable blips. It was an interesting phenomenon. Woods Hole, a tiny community on what is essentially a peninsula near Falmouth, is both a center for oceanographic science (WHOI, USGS -- disclaimer, I've worked at both), and a summer home for the insanely rich. The scientific community was largely in support of the turbines, but all anyone ever heard about was how the turbines would be a huge disaster. As I recall, many of the noise complaints ended up being somewhat unfounded.
  - 1propionyl 6y ago
    In truth, the real reason for the disparity in perception is... supernatural in origin. You see... it's the Curse of Chappaquidick. The sound isn't just the breeze passing through turbines. It's the wailing of the immortal soul of Mary Jo Kopechne, her soul mercifully freed from the watery depths but bound to the wind. Her soul, unable to find rest so long as the negligent and wealthy haunt her resting place, now eternally floats upon the wind... from Chappaquidick into the Vineyard Sound... across Penzance Point... into the Bay, and back out to sea. But her spirit is not unkind or unfair. She has no discontent for teachers, scientists, artists, or sailors. They cannot hear her. They say... that only the truly wealthy can hear her cries.
    - anonu 6y ago
      One of the stranger things I've read on HN.
      - 6y ago
- tejtm 6y ago
  We called them "partridge" they will stand on a hollow log and use it as a resonator. Sounds like a hit-n-miss engine starting up then petering our
- rewtraw 6y ago
  When I thru hiked the Appalachian Trail I nearly went mad trying to identify that “drumming” sound. It was so deep that it felt like it was coming from inside my body, and I was concerned that it was some strange condition. Finally, at one point I asked a group of other thru hikers if they had experienced it, and they all excitedly nodded, but none of us knew the source. Finally, some local day hiker said “oh, it’s probably just a grouse”. And the mystery was solved. Many of us were very confused for months!
  - dustym 6y ago
    This is funny, the first couple of times I heard it I also wondered if I was going a bit mad. When you are out all alone and you hear a sound that you can't explain I think it's pretty natural to think that.
- TaylorAlexander 6y ago
  "felt justifiably annoyed at the encroachment of the industrial world into my backwoods trip" Sure, yes. The annoyance is justifiable. And I do not mean to come off as combative. I just wanted to say that our alternative forms of energy also encroach on the natural world in other ways (climate change, dirty mining, etc). So while turbines might more viscerally feel like an encroachment on nature, we must remember that they may displace some more destructive form of energy generation. I am not equipped to argue definitively that they are better, just that the visibility of wind turbines might influence our perception of them.
- heelix 6y ago
  Same think was driving me nuts in the BWCA, camping in areas where there should not be any engines. Came back all salty that someone must have a gas powered well or something. Outfitter said I should find a recording of a horny grouse... and I'll be damned, that was it beating its wings. Last trip over Memorial weekend we had one nearby, and it brought nothing but smiles.
  - greggman3 6y ago
    So how has this affected your life since? Did you stop assuming things more? Do you like the sound of lawn mowers because they sound like a natural sound?
    - heelix 6y ago
      Not a huge change - a smile rather than a tut when I hear the distinctive sound. The BWCA is a protected area where they really try to keep the water clean. Folks have cabins near the area (heck, some day I'd like a cabin up there) and I was sure someone had a well pump or something that was spinning up sporadically. Changed my perceptions of the noise - rather than assuming I'd failed to get far enough into the wilderness, I came to realize I'm in the thick of it. Headed back up there in a couple days. Hope to hear the grouse pounding their wings, the moose walking through the water, and a wolf howling away.
- exabrial 6y ago
  Reminds me of the first time I heard a moose as a kid. Something from just out of this world.
- yellowapple 6y ago
  Speaking of #2, awhile back I was wondering what noises emus make and it turns out to be something I wouldn't have ever expected any animal to make: https://www.youtube.com/watch?v=KOLF7JhW2Iw https://www.youtube.com/watch?v=KOLF7JhW2Iw Kinda soothing, really. Just soft, deep thumps.
- DagAgren 6y ago
  Wind turbines do not make that kind of noise. It's always, every single time, people angry about their view or any kind of change at all. Every single time.
johnfn 6y ago
When I lived in Nob Hill, there was a quiet long beeping sound that could be heard every couple of minutes - imagine a quiet booooop and you're pretty much there. Definitely sounded electronic. The weird thing was I could actually hear it on quiet days in a large radius in Nob Hill. It didn't seem to be localized on my house. I was never able to identify it, and searching online gave me nothing.
- qppo 6y ago
  I had this problem in college. Turned out to be the wind blowing over a small hole in a pipe, creating a whistle.
- komali2 6y ago
  It wasn't the foghorn was it?
- mareko 6y ago
  Could you be hearing one of the many foghorns in the bay? https://youtu.be/jJWd5eHeFY4 https://youtu.be/jJWd5eHeFY4
  - johnfn 6y ago
    Pretty interesting hypothesis! I don't think so, though. It was a fairly electronic sounding boop, almost like a low sine wave. A fog horn sound has more acoustic qualities to it. Also, if it was a fog horn, I don't know why it would only be audible in Nob Hill and no where else I've been in SF.
    - closeparen 6y ago
      The Bay foghorns are electronic tones; they don’t sound like classic/cartoon foghorns at all.
      - stn8188 6y ago
        If it's anything like the most common fog horn that the USCG uses across the country, it's a 273Hz tone (though I don't recall the waveform, most likely sinusoidal). As of 8 years ago, they were using the FA-232 model fog horn, the circuitry was designed in the '70s and uses discrete BJTs on the boards to generate the tone and drive the "speaker".
Exmoor 6y ago
Mysterious sounds are very intriguing. My favorite is the mysterious sounds heard by Lewis and Clark on their expedition. This article goes down a bit of a rabbit hole, but it starts with a fairly good summary: http://www.lewis-clark.org/article/1468 http://www.lewis-clark.org/article/1468
interestica 6y ago
Crazy. Could someone do this maliciously? Was there any specific aspect of the window that made it resonate more than another?
Marsymars 6y ago
A couple years ago I got moved to a new office where I could hear an awful humming noise from the light ballasts in the ceiling when the lights in a showroom/lobby downstairs were turned on. None of other dozen people in my office could hear it. I feel like I wasted a bunch of perfectly good political capital at work in my fight with building management to get them to fix the lights. They finally replaced them with ballast-free LEDs after six months.
- goldenkey 6y ago
  Same thing happened with me and getting a full spectrum light for a windowless office. I left the job not too long after due to an abusive manager. Certainly wasted political clout on the push for health.
tbodt 6y ago
https://xkcd.com/1590/ https://xkcd.com/1590/
01100011 6y ago
I was going insane at my old house because of 'the hum'. It started when I installed double pane windows. I think they dropped the ambient noise to the point where the hum was obvious. Any idea what you'd use to track down very low frequency noise sources(i.e. 15-60Hz)? I don't think a lot of sensors do well in that range.
- CamperBob2 6y ago
  Get an audio spectrum analyzer app for your phone, and enable its log-X scale. Very useful for this sort of thing. The FFT will reveal sounds you don't hear yourself.
  - krisoft 6y ago
    They are indeed cool, but no math magic can help you if your microphone is not picking up the signal. I don’t have datasheets for mobile phone microphones but lets look at some professional ones. The Senheiser MD 46 goes down to 40hz. The Behringer MC8000 goes down to 15hz. These are just two random samples I looked at to illustrate that its not obvious that a microphone will even have a good response down to 10hz.
    - CamperBob2 6y ago
      Those ratings are 3-dB points, not brick walls. It doesn't need to have a good response down to 10 Hz (and it's safe to say that it won't). The main drawback is that you may have to wait a while between updates.
- krisoft 6y ago
  Never tried but i would go for a geophone. The datasheet of this one https://www.sparkfun.com/products/11744 https://www.sparkfun.com/products/11744 says that it has reasonable response along that range.
- nullc 6y ago
  I got an infrasound microphone but all it did was demonstrate that the hum I can (barely) hear (and that my partner cannot hear) is real... and that indeed it doesn't go away when I cut power to everything within 500ft of my home (which I believed from my own observation, but wasn't completely sure of).
fchu 6y ago
Reminds me of a prank that some co-workers pulled off: they bought some gadgets that would make a cricket sound but at random, irregular intervals, and hid it in a person's office. It drove that person insane as they slowly and methodically moved all pieces of furniture out of their office.
- j88439h84 6y ago
  Sounds like one of those "pranks" that's actually just reducing someone's quality of life.
- loco5niner 6y ago
  Pranks are only funny when everyone thinks they are funny.
AmericanChopper 6y ago
I get woken up once a week by a sound similar to the one the Golden Gate Bridge is making. It starts around 4am, except it comes in short pulses. I recently figured out it was the breaks on the garbage truck that services my neighbourhood. They make a really loud high pitch hum every time it stops, and when the truck isn’t particularly close by, you can’t hear the rest of the truck sounds, but you can hear that hum very loudly. The local council didn’t really care when I told them. It doesn’t bother me too much because I get up quite early anyhow, but I imagine this truck would manage to bother a rather large number of people every week. I wonder if the sound will go away next time it’s serviced.
cosmodisk 6y ago
How did you manage to track it,may I ask?
harikb 6y ago
My backyard backs in to a strip mall with an auto mechanic shop. We hear a high pitch sound some times of the day and when we step outside to inspect, we only hear a different sound from the shop behind - a typical machine running, but not necessarily unpleasant. Turns out the walls are able to mask the lower pitch sound somehow and let in only the unpleasant higher pitch sound to the inside of the house. I am not sure how to explain it to the shop owner, but we are just going to ignore it for now. I guess I need to look into insulation options :)
- jml7c5 6y ago
  Have you checked for windows resonating? It would be surprising if walls were acting as a high-pass filter. Could also be electronic noise. I wonder what the machine is.
  - heavenlyblue 6y ago
    Do you think the high-pitch sound reflects from the house opposite to the windows?
  - abakker 6y ago
    Air powered die grinder, drill, or impact gun. Or, if it sounds real choppy, maybe an AC TIG welder. I’d bet die grinder. They’re not used all the time, and they have VERY high rpm sounds which are always terrible.
sgt 6y ago
Sound disturbances can cause health problems. Imagine living next to noisy neighbors and how that would affect you long term.
robbrown451 6y ago
Had that where I live, for the first year. San Francisco as well (it's windy here!) Finally after about a year of it, figured out it was the turbine ventilator on my next door neighbor's roof. She was a bit elderly and didn't seem to want to do anything. Luckily I realized I could reach it from my own roof. So I jammed a stick in it and it never spun again. Problem solved!
- layoutIfNeeded 6y ago
  You realize that those ventilators need to spin in order to function, right? Now her apartment won’t be ventilated properly.
  - robbrown451 6y ago
    It's just an attic ventilator. And yes I know. My sanity outweighs the air quality of her attic. And I told her first. (FWIW she's a very nice lady and has long since sold the house and moved away. I told her I had done that at one point and she just chuckled and didn't care)
personlurking 6y ago
In my last apt, once in a while I'd start hearing a far-off hum, and it would always make my wifi go out. I eventually tracked it down to a huge backup generator for a commercial plaza a few blocks away, but telling my ISP that a distant hum cuts out the internet every once in a while wasn't going to get me anywhere.
TrackerFF 6y ago
For a good year I used to here this high-pitched whine when visiting my grandparents. I could hear it throughout the house, and though it was either a faulty vent, or seagull chicks on the roof. It was not constant, and rather intermittent. I checked everything, but nothing. Asked my grandparents about it, but they couldn't hear any noises. Finally I got a friend over, and he could hear it clear as day. One day I noticed my grandmothers hearing aids lying in a casing, and it turns out those were the source of noise. She'd forget to take out the batteries, and they would create a negative feedback-loop that came and went.
- shitloadofbooks 6y ago
  High pitch noises are the first to degrade with age. Even >25 years old you typically start to lose certain pitches. It's why kids could hear the whine of CRTs and their parents were completely oblivious, etc.
jxramos 6y ago
Nice work! Any specific techniques you used to identify the source? I've longed for the day an inexpensive or software based acoustic camera comes into reach. So many sounds I've been on the hunt for in the past an even unto today. https://en.wikipedia.org/wiki/Acoustic_camera https://en.wikipedia.org/wiki/Acoustic_camera
- aaronblohowiak 6y ago
  Ooh I wonder if hacking a smart speaker would let you make one
asdff 6y ago
I hear what I suspect is the subway on the next street over moving underground periodically throughout the day. There isn't even a station there, I just hear a low rumbling that moves up or down the route.

dustym 6y ago

Two unrelated anecdotes: 1. A few years ago I spent some time in Falmouth, MA and there was an ongoing battle over newly installed wind turbines. The humming sound was getting to people, including to the point where they were getting headaches. Some people heard it and others didn't. The locals were going to war with the initiative. This article reminded me of that and I checked in on the ordeal. Looks like they shuttered the project and have started dismantling the turbines. It seems like a total failure: https://www.wsj.com/articles/a-green-new-deal-in-profile-11549325968 https://www.wsj.com/articles/a-green-new-deal-in-profile-115... 2. I was on a solo canoe trip in a remote part of Maine a couple of weekends ago and I kept hearing the sound of a motor start up and then die down. I heard it multiple times along a 25 or so mile stretch of water with the only other sounds being birds, moose rumbling in the woods, and beavers slapping the water with their tails. I chalked the sound up to some wind turbines I had seen on my drive up there and felt justifiably annoyed at the encroachment of the industrial world into my backwoods trip. I did some research when I got home and it turned out that I was hearing ruffed grouse "drumming" to mark their territory. In retrospect, it's an amazing sound: https://youtu.be/q0obByQW23k?t=21 https://youtu.be/q0obByQW23k?t=21

Wowfunhappy 6y ago
Geez, I'm torn on number one, since obviously locals should be able to live in peace, but the world is in such incredibly dire need of clean energy. Surely this was an issue with these specific turbines, right? Not a problem with all of them?
- klohto 6y ago
  Anecdotal evidence, but I have the same experience as well. I’m not from US, so I will assume it’s a different type of turbine. Wind turbines were installed near our village and my family started hearing sounds and feeling vibrations. I didn’t hear and don’t hear them when I return there, but it forced my parents to leave their home. It’s a horrible feeling, especially since people don’t believe you. It can hardly be measured, because people with the correct equipment don’t pay attention to you and other people think you’re crazy. Actually, if anybody has more information on how would I go around fixing this issue or which party should I raise this with, I would welcome that. It’s been more than a decade but the turbine is still there even though affected people have moved out.
  - technicaldonut 6y ago
    That's actually a scientifically recorded fact. German researches recorded the sleep patterns of 397 residents in areas where there was previously no mobile reception. After erecting 10 towers, many people complained about a change in sleep patterns. 5 of the 10 towers were turned off though so had no actual effect. Just the believe was enough to cause problems. [0] [0] https://pubmed.ncbi.nlm.nih.gov/20737608/ https://pubmed.ncbi.nlm.nih.gov/20737608/
    - oliveshell 6y ago
      Well, it could have been unrelated to radio emissions: resonant sounds caused by wind blowing through the tall towers, for example.
- fragmede 6y ago
  Low-grade humming is exhausting anyway. That's one of the reasons people are so tired after a long plane flight, despite just sitting there. Giant stationary installations with very loud noises tend to cause weird noise issues. It's a lot of unfocused, or weirdly focused sonic energy that can't be heard from a little further away, but at exactly the right (well, wrong) place, it can get re-focused, leading to a droning noise that starts and stops unexpectedly. A good example that shows this phenomenon is real, despite being invisible is the Listening Vessels[0] exhibit at the Exploratorium or similar, with two giant parabolic sound reflectors. For the wind farm, the issue isn't just turbines, but that specific turbine, down to the serial number and the serial number plate, at that exact location, temperature, humidity, causing a resonance in a specific resident's door, miles away. The resident may be able to replace, eg, the door, but often there are factors outside of the resident's control that contribute to the issue. Like the siding on the neighbor's house, or where their car is parked. Ideally an acoustical consultant would be brought in during the design stage (just like SREs should be brought in during the design phase of a new service and not 5 minutes before it goes live), but that almost never happens, as we see (well hear) here. At least in this case the noise can be heard by everybody. Imagine this noise coming off the bridge, but it's only audible from your bedroom Tuesdays when its cloudy. And none of your neighbors can hear it. You'd think you'd gone mad! [0] https://www.exploratorium.edu/exhibits/listening-vessels https://www.exploratorium.edu/exhibits/listening-vessels
dylan604 6y ago
2) It's amazing how perspective changes with more information. It is very odd how much that sounds just like a mower having difficulty starting, and is exactly the conclusion I would have jumped to it being. Glad you were able to get a better answer.
- dustym 6y ago
  Yeah, I thought it was a generator or mower at first. It's just quiet enough that I mistook it for a much louder sound that had grown faint due to my distance from the source.
- chubot 6y ago
  Are the birds imitating sounds they heard in the forest? Mimicry is a powerful thing
  - dylan604 6y ago
    I went deeper down the rabbit hole, and it is their mating call / territorial signal. The drumming sound is actually created from a vacuum effect caused by the particular movement of their wings. https://www.youtube.com/watch?v=vERkh23mp64 https://www.youtube.com/watch?v=vERkh23mp64
  - tejtm 6y ago
    It's a mating call that predates combustion engines most likely by millennia(s)
    - dylan604 6y ago
      I wonder how long Poly has wanted a cracker
      - tejtm 6y ago
        Two billion years give or take
blackguardx 6y ago
I think the complaints about Falmouth wind turbine noise are eerily similar to complaints that wifi gives people headaches. I don’t think they are founded in reality.
- brendoelfrendo 6y ago
  My parents lived up that way, and the amount of NIMBY-ism regarding offshore turbines is staggering. I suspect you may be right, and people just latched onto whatever claim got the turbines shut down.
  - Drdrdrq 6y ago
    It is also possible that they generate the sound of the same frequency, but coming from multiple sources it can compound in some areas to be louder than elsewhere - and those areas could change with the direction of the wind. This is purely speculation from my side of course, as I've never been there.
    - DagAgren 6y ago
      No, it's a pretty safe bet that any of these complaints about wind turbines is just NIMBYism. It happens every single time.
- deleted 6y ago
  [deleted]
- mandelbrotwurst 6y ago
  How are those similar? What about this story leads you believe that these people are claiming to be hearing frequencies outside of those known by science to be audible to humans?
yread 6y ago
Your description reminded me of a similar sound on my first night on anchor with my first chartered yacht. Turns out it was a fan in our inverter that was somehow switched on and it completely drained both our batteries (wrong installation) overnight so we couldn't lift the anchor nor start the engine in the morning
- forgotmyp77 6y ago
  how did you get out of that one?
  - alias_neo 6y ago
    Use the sails and lift the anchor manually? (I'm guessing, don't have a yacht).
    - Drdrdrq 6y ago
      You would have trouble landing without the engine though. Better not to risk it if there's no problem with being anchored there, and just waiting for the fix.
      - yread 6y ago
        It's possible - I did the RYA training which describes the theory of it and we even involuntarily attempted it in practicals (gearbox broke and it wouldn't go forward). But it's definitely not easy. In the end we hit a spot in the marina with absolutely no wind and had to swallow our seamanship pride and back up there
      - alias_neo 6y ago
        I forgot about the part where you would have a phone and can call for help! Why is the landing part hard, is it about maneuvering and slowing?
        Drdrdrq 6y ago
mprovost 6y ago
Just across Buzzards Bay from Falmouth was the original Marconi transmitting station for transatlantic communication to a receiver in Norway. My great-grandfather helped build it in 1914! At the time it was the most powerful transmitter in the world at 300 kW. There were 14 440-foot towers in a grid, and it was so powerful that apparently anywhere in town you would get zapped while hanging out the laundry on a clothesline, and you couldn't get a TV signal in town until the towers stopped operating. To avoid interference the receiver had to be located 40 miles away in Chatham.
- dustym 6y ago
  Very interesting. Maine also has a significant transmitter array in Cutler with 30 or so antennas around 900 ft tall apiece. https://en.wikipedia.org/wiki/VLF_Transmitter_Cutler https://en.wikipedia.org/wiki/VLF_Transmitter_Cutler I wonder what it's like to try to pull a signal up there. Your comment brings up memories of Lighthouse Beach in Chatham, which has a ton of warnings about Great White Sharks due to the prevalence of seals in the waters. Beautiful place. If the sharks don't get you the radio frequencies will I guess.
  - mprovost 6y ago
    Just further up the coast is Marconi Beach in the Cape Cod National Seashore - same sharks.
  - jimmyswimmy 6y ago
    Picking up TV and other RF signals near there should not be a problem. Modern transmitters are much different than in Marconi's time. Then they used a spark gap to generate RF, which have a DC to daylight kind of output that GP described. Much like a bad ground on a car ignition system can make a lot of RF noise that really gets around, a spark gap transmitter puts out a signal EVERYWHERE. Which is why it affected so much. Modern transmitters are tuned and filtered so they can coexist with everything else.
mike_red5hift 6y ago
RE: #2. I remember the first time I heard that sound when I moved from the city to the woods of NH. I thought someone was trying to crank up some kind of motor, too. Then I eventually caught a glimpse of a ruffed grouse doing its thing. Neat.
rasz 6y ago
1 Modern CFD techniques enable almost silent blades. If a $10 computer fan can have special dimples/channels why cant wind turbines https://www.quietpc.com/nf-a12x25-5v https://www.quietpc.com/nf-a12x25-5v https://cougargaming.com/us/products/cooling/cfd_red_led_fan/ https://cougargaming.com/us/products/cooling/cfd_red_led_fan... https://aerocool.io/us/product/silent-master-blue-20cm/ https://aerocool.io/us/product/silent-master-blue-20cm/
- deleted 6y ago
  [deleted]
- close04 6y ago
  Well... size matters. The tip of a wind turbine blade moves much faster (~25m/s, up to 80m/s in the biggest ones) than the tip of a silent computer fan (~5-6m/s, up to ~10m/s in the faster ones). You can make the blades more silent but there's a limit to what you can do when your blades move that fast and are up to 75m long. And any solution that reduces efficiency is probably a no go for manufacturers and operators. From your links you can see that a 140mm computer fan at 1000RPM is noisier than a 120mm fan at 1200RPM. Even if the motor is quieter at the lower RPM, increasing the blade size is more than able to compensate and make it overall noisier, even with dimples and owl-wing tricks. And it's not only the decibels that are the issue necessarily but also the frequencies which can propagate quite far and by all accounts are pretty disturbing. That low frequency hum that the blades produce by simply displacing air while they move is not a problem with a computer fan's tiny blades. And turbines come in farms.
- jungletime 6y ago
  Experiment! How Does An Owl Fly So Silently? https://www.youtube.com/watch?v=d_FEaFgJyfA https://www.youtube.com/watch?v=d_FEaFgJyfA
- metalliqaz 6y ago
  Fans are not turbines. You understand that, right?
adtechperson 6y ago
That ruffed grouse video is great but does not really do justice to how startling that sound can be. Imagine walking through the woods, no one around, and all of a sudden it sounds like a lawn mower starting up very close to you. It is unbelievably startling, even if you know what it is.
- alias_neo 6y ago
  As a horror film fan, I was thinking combustion powered chainsaw.
  - emmelaich 6y ago
    The lyrebird can imitate a chainsaw -- among many other things. This is from the BBC's Life on Earth. https://www.youtube.com/watch?v=VjE0Kdfos4Y https://www.youtube.com/watch?v=VjE0Kdfos4Y
    - sah2ed 6y ago
      That’s amazing, thanks for the share! I’m one of today’s lucky 10,000.
      - emmelaich 6y ago
        Excellent! I thought everyone had seen this, indeed. Don't fall for the parody though ... https://www.youtube.com/watch?v=KOFy8QkNWWs https://www.youtube.com/watch?v=KOFy8QkNWWs
        twic 6y ago
        Nor this apparent imitation of the clearly inimitable Big Shaq: https://www.youtube.com/watch?v=jzT_TtrVcRk https://www.youtube.com/watch?v=jzT_TtrVcRk
    - alias_neo 6y ago
      Wow thanks. The camera shutter and car alarm were something but that chain saw sound is incredible.
tomcam 6y ago
OK that grouse sound is very trippy considering the context. I would’ve been in the exact same mindset as you. Thank you for sharing.
rconti 6y ago
1. didn't feel like something that needed to be editorialized, but I guess WSJ disagrees.
gwright 6y ago
So funny to hear your story about your canoe trip. When I hiked the AT in 2002, I spent the first several days having the same experience you had. I thought I was hearing things, then I thought I was much closer to civilization that I expected and hearing lawn mowers, finally talked to other hikers and got the story. I found my trail journal entry about this: https://www.trailjournals.com/journal/entry/14113 https://www.trailjournals.com/journal/entry/14113
joebergeron 6y ago
1. Very funny to be reading this. I grew up in Falmouth, and lived there until 2014 when I graduated highschool. I obviously wasn't incredibly attuned to this issue, but as I recall, the only people opposed to the installation of the turbines were a very small, very vocal, and very, very, wealthy minority of people who owned mind-bogglingly expensive beach houses and lived there two months out of the year. I'm fairly certain a lot of the more reasonable-sounding complaints they threw at the project were simply cover-up for their real gripe, that the turbines ruined their view over the bay. I recall an unintentionally hilarious piece of mockup art that was drafted up, comparing the horizon over the water with and without turbines, side by side. They were barely distinguishable blips. It was an interesting phenomenon. Woods Hole, a tiny community on what is essentially a peninsula near Falmouth, is both a center for oceanographic science (WHOI, USGS -- disclaimer, I've worked at both), and a summer home for the insanely rich. The scientific community was largely in support of the turbines, but all anyone ever heard about was how the turbines would be a huge disaster. As I recall, many of the noise complaints ended up being somewhat unfounded.
- 1propionyl 6y ago
  In truth, the real reason for the disparity in perception is... supernatural in origin. You see... it's the Curse of Chappaquidick. The sound isn't just the breeze passing through turbines. It's the wailing of the immortal soul of Mary Jo Kopechne, her soul mercifully freed from the watery depths but bound to the wind. Her soul, unable to find rest so long as the negligent and wealthy haunt her resting place, now eternally floats upon the wind... from Chappaquidick into the Vineyard Sound... across Penzance Point... into the Bay, and back out to sea. But her spirit is not unkind or unfair. She has no discontent for teachers, scientists, artists, or sailors. They cannot hear her. They say... that only the truly wealthy can hear her cries.
  - anonu 6y ago
    One of the stranger things I've read on HN.
    - 6y ago
tejtm 6y ago
We called them "partridge" they will stand on a hollow log and use it as a resonator. Sounds like a hit-n-miss engine starting up then petering our
rewtraw 6y ago
When I thru hiked the Appalachian Trail I nearly went mad trying to identify that “drumming” sound. It was so deep that it felt like it was coming from inside my body, and I was concerned that it was some strange condition. Finally, at one point I asked a group of other thru hikers if they had experienced it, and they all excitedly nodded, but none of us knew the source. Finally, some local day hiker said “oh, it’s probably just a grouse”. And the mystery was solved. Many of us were very confused for months!
- dustym 6y ago
  This is funny, the first couple of times I heard it I also wondered if I was going a bit mad. When you are out all alone and you hear a sound that you can't explain I think it's pretty natural to think that.
TaylorAlexander 6y ago
"felt justifiably annoyed at the encroachment of the industrial world into my backwoods trip" Sure, yes. The annoyance is justifiable. And I do not mean to come off as combative. I just wanted to say that our alternative forms of energy also encroach on the natural world in other ways (climate change, dirty mining, etc). So while turbines might more viscerally feel like an encroachment on nature, we must remember that they may displace some more destructive form of energy generation. I am not equipped to argue definitively that they are better, just that the visibility of wind turbines might influence our perception of them.
heelix 6y ago
Same think was driving me nuts in the BWCA, camping in areas where there should not be any engines. Came back all salty that someone must have a gas powered well or something. Outfitter said I should find a recording of a horny grouse... and I'll be damned, that was it beating its wings. Last trip over Memorial weekend we had one nearby, and it brought nothing but smiles.
- greggman3 6y ago
  So how has this affected your life since? Did you stop assuming things more? Do you like the sound of lawn mowers because they sound like a natural sound?
  - heelix 6y ago
    Not a huge change - a smile rather than a tut when I hear the distinctive sound. The BWCA is a protected area where they really try to keep the water clean. Folks have cabins near the area (heck, some day I'd like a cabin up there) and I was sure someone had a well pump or something that was spinning up sporadically. Changed my perceptions of the noise - rather than assuming I'd failed to get far enough into the wilderness, I came to realize I'm in the thick of it. Headed back up there in a couple days. Hope to hear the grouse pounding their wings, the moose walking through the water, and a wolf howling away.
exabrial 6y ago
Reminds me of the first time I heard a moose as a kid. Something from just out of this world.
yellowapple 6y ago
Speaking of #2, awhile back I was wondering what noises emus make and it turns out to be something I wouldn't have ever expected any animal to make: https://www.youtube.com/watch?v=KOLF7JhW2Iw https://www.youtube.com/watch?v=KOLF7JhW2Iw Kinda soothing, really. Just soft, deep thumps.
DagAgren 6y ago
Wind turbines do not make that kind of noise. It's always, every single time, people angry about their view or any kind of change at all. Every single time.

johnfn 6y ago

When I lived in Nob Hill, there was a quiet long beeping sound that could be heard every couple of minutes - imagine a quiet booooop and you're pretty much there. Definitely sounded electronic. The weird thing was I could actually hear it on quiet days in a large radius in Nob Hill. It didn't seem to be localized on my house. I was never able to identify it, and searching online gave me nothing.

qppo 6y ago
I had this problem in college. Turned out to be the wind blowing over a small hole in a pipe, creating a whistle.
komali2 6y ago
It wasn't the foghorn was it?
mareko 6y ago
Could you be hearing one of the many foghorns in the bay? https://youtu.be/jJWd5eHeFY4 https://youtu.be/jJWd5eHeFY4
- johnfn 6y ago
  Pretty interesting hypothesis! I don't think so, though. It was a fairly electronic sounding boop, almost like a low sine wave. A fog horn sound has more acoustic qualities to it. Also, if it was a fog horn, I don't know why it would only be audible in Nob Hill and no where else I've been in SF.
  - closeparen 6y ago
    The Bay foghorns are electronic tones; they don’t sound like classic/cartoon foghorns at all.
    - stn8188 6y ago
      If it's anything like the most common fog horn that the USCG uses across the country, it's a 273Hz tone (though I don't recall the waveform, most likely sinusoidal). As of 8 years ago, they were using the FA-232 model fog horn, the circuitry was designed in the '70s and uses discrete BJTs on the boards to generate the tone and drive the "speaker".

Exmoor 6y ago

Mysterious sounds are very intriguing. My favorite is the mysterious sounds heard by Lewis and Clark on their expedition. This article goes down a bit of a rabbit hole, but it starts with a fairly good summary: http://www.lewis-clark.org/article/1468 http://www.lewis-clark.org/article/1468

interestica 6y ago

Crazy. Could someone do this maliciously? Was there any specific aspect of the window that made it resonate more than another?

Marsymars 6y ago

A couple years ago I got moved to a new office where I could hear an awful humming noise from the light ballasts in the ceiling when the lights in a showroom/lobby downstairs were turned on. None of other dozen people in my office could hear it. I feel like I wasted a bunch of perfectly good political capital at work in my fight with building management to get them to fix the lights. They finally replaced them with ballast-free LEDs after six months.

goldenkey 6y ago
Same thing happened with me and getting a full spectrum light for a windowless office. I left the job not too long after due to an abusive manager. Certainly wasted political clout on the push for health.

tbodt 6y ago

https://xkcd.com/1590/ https://xkcd.com/1590/

01100011 6y ago

I was going insane at my old house because of 'the hum'. It started when I installed double pane windows. I think they dropped the ambient noise to the point where the hum was obvious. Any idea what you'd use to track down very low frequency noise sources(i.e. 15-60Hz)? I don't think a lot of sensors do well in that range.

CamperBob2 6y ago
Get an audio spectrum analyzer app for your phone, and enable its log-X scale. Very useful for this sort of thing. The FFT will reveal sounds you don't hear yourself.
- krisoft 6y ago
  They are indeed cool, but no math magic can help you if your microphone is not picking up the signal. I don’t have datasheets for mobile phone microphones but lets look at some professional ones. The Senheiser MD 46 goes down to 40hz. The Behringer MC8000 goes down to 15hz. These are just two random samples I looked at to illustrate that its not obvious that a microphone will even have a good response down to 10hz.
  - CamperBob2 6y ago
    Those ratings are 3-dB points, not brick walls. It doesn't need to have a good response down to 10 Hz (and it's safe to say that it won't). The main drawback is that you may have to wait a while between updates.
krisoft 6y ago
Never tried but i would go for a geophone. The datasheet of this one https://www.sparkfun.com/products/11744 https://www.sparkfun.com/products/11744 says that it has reasonable response along that range.
nullc 6y ago
I got an infrasound microphone but all it did was demonstrate that the hum I can (barely) hear (and that my partner cannot hear) is real... and that indeed it doesn't go away when I cut power to everything within 500ft of my home (which I believed from my own observation, but wasn't completely sure of).

fchu 6y ago

Reminds me of a prank that some co-workers pulled off: they bought some gadgets that would make a cricket sound but at random, irregular intervals, and hid it in a person's office. It drove that person insane as they slowly and methodically moved all pieces of furniture out of their office.

j88439h84 6y ago
Sounds like one of those "pranks" that's actually just reducing someone's quality of life.
loco5niner 6y ago
Pranks are only funny when everyone thinks they are funny.

AmericanChopper 6y ago

I get woken up once a week by a sound similar to the one the Golden Gate Bridge is making. It starts around 4am, except it comes in short pulses. I recently figured out it was the breaks on the garbage truck that services my neighbourhood. They make a really loud high pitch hum every time it stops, and when the truck isn’t particularly close by, you can’t hear the rest of the truck sounds, but you can hear that hum very loudly. The local council didn’t really care when I told them. It doesn’t bother me too much because I get up quite early anyhow, but I imagine this truck would manage to bother a rather large number of people every week. I wonder if the sound will go away next time it’s serviced.

cosmodisk 6y ago

How did you manage to track it,may I ask?

harikb 6y ago

My backyard backs in to a strip mall with an auto mechanic shop. We hear a high pitch sound some times of the day and when we step outside to inspect, we only hear a different sound from the shop behind - a typical machine running, but not necessarily unpleasant. Turns out the walls are able to mask the lower pitch sound somehow and let in only the unpleasant higher pitch sound to the inside of the house. I am not sure how to explain it to the shop owner, but we are just going to ignore it for now. I guess I need to look into insulation options :)

jml7c5 6y ago
Have you checked for windows resonating? It would be surprising if walls were acting as a high-pass filter. Could also be electronic noise. I wonder what the machine is.
- heavenlyblue 6y ago
  Do you think the high-pitch sound reflects from the house opposite to the windows?
- abakker 6y ago
  Air powered die grinder, drill, or impact gun. Or, if it sounds real choppy, maybe an AC TIG welder. I’d bet die grinder. They’re not used all the time, and they have VERY high rpm sounds which are always terrible.

sgt 6y ago

Sound disturbances can cause health problems. Imagine living next to noisy neighbors and how that would affect you long term.

robbrown451 6y ago

Had that where I live, for the first year. San Francisco as well (it's windy here!) Finally after about a year of it, figured out it was the turbine ventilator on my next door neighbor's roof. She was a bit elderly and didn't seem to want to do anything. Luckily I realized I could reach it from my own roof. So I jammed a stick in it and it never spun again. Problem solved!

layoutIfNeeded 6y ago
You realize that those ventilators need to spin in order to function, right? Now her apartment won’t be ventilated properly.
- robbrown451 6y ago
  It's just an attic ventilator. And yes I know. My sanity outweighs the air quality of her attic. And I told her first. (FWIW she's a very nice lady and has long since sold the house and moved away. I told her I had done that at one point and she just chuckled and didn't care)

personlurking 6y ago

In my last apt, once in a while I'd start hearing a far-off hum, and it would always make my wifi go out. I eventually tracked it down to a huge backup generator for a commercial plaza a few blocks away, but telling my ISP that a distant hum cuts out the internet every once in a while wasn't going to get me anywhere.

TrackerFF 6y ago

For a good year I used to here this high-pitched whine when visiting my grandparents. I could hear it throughout the house, and though it was either a faulty vent, or seagull chicks on the roof. It was not constant, and rather intermittent. I checked everything, but nothing. Asked my grandparents about it, but they couldn't hear any noises. Finally I got a friend over, and he could hear it clear as day. One day I noticed my grandmothers hearing aids lying in a casing, and it turns out those were the source of noise. She'd forget to take out the batteries, and they would create a negative feedback-loop that came and went.

shitloadofbooks 6y ago
High pitch noises are the first to degrade with age. Even >25 years old you typically start to lose certain pitches. It's why kids could hear the whine of CRTs and their parents were completely oblivious, etc.

jxramos 6y ago

Nice work! Any specific techniques you used to identify the source? I've longed for the day an inexpensive or software based acoustic camera comes into reach. So many sounds I've been on the hunt for in the past an even unto today. https://en.wikipedia.org/wiki/Acoustic_camera https://en.wikipedia.org/wiki/Acoustic_camera

aaronblohowiak 6y ago
Ooh I wonder if hacking a smart speaker would let you make one

asdff 6y ago

I hear what I suspect is the subway on the next street over moving underground periodically throughout the day. There isn't even a station there, I just hear a low rumbling that moves up or down the route.