Low frequency (maybe infrasound) between houses-expert advice needed
Low frequency (maybe infrasound) between houses-expert advice needed
(OP)
Hi
Thank you for looking at my post, I appreciate any input and am looking for some expert advice on my situation.
Regardless of this is on purpose or not I hope we can focus on the details below. My primary concern is if something is attached or touching my house
My neighbour is in a wooden house and I am next door in a cast concrete house, there is about 1 meter between us and both of our first floors are partly underground.
There is an excruciating low frequency noise coming from their house to mine and I don’t know how. As their house is wood I cannot see how they can do it without disturbing their living too but it is happening. Times are irregular and I have had everything checked in the house already (water/elec/air con etc...)
One important thing to note is my neighbour is a professional acoustic/sound engineer so this is why I am asking for your input
It is hard to record this low sound so I guess it’s under the hearing spectrum so maybe it’s Info or really low frequency. When I press my ear to the window I can hear it outside, I can’t hear through the concrete wall. When it is on my bed feels vibration when I am in it.
My only guess is a directional speaker in his underground floor with low level frequency coming out but I don’t know. Also if my bed vibrates from it would that mean whatever is making this noise be touching my house somewhere and it’s going through the structure.
The sound is loud and my ears are ringing from it. I have had my hearing checked out also.
Any input or questions are appreciated, thank you for your time
Thank you for looking at my post, I appreciate any input and am looking for some expert advice on my situation.
Regardless of this is on purpose or not I hope we can focus on the details below. My primary concern is if something is attached or touching my house
My neighbour is in a wooden house and I am next door in a cast concrete house, there is about 1 meter between us and both of our first floors are partly underground.
There is an excruciating low frequency noise coming from their house to mine and I don’t know how. As their house is wood I cannot see how they can do it without disturbing their living too but it is happening. Times are irregular and I have had everything checked in the house already (water/elec/air con etc...)
One important thing to note is my neighbour is a professional acoustic/sound engineer so this is why I am asking for your input
It is hard to record this low sound so I guess it’s under the hearing spectrum so maybe it’s Info or really low frequency. When I press my ear to the window I can hear it outside, I can’t hear through the concrete wall. When it is on my bed feels vibration when I am in it.
My only guess is a directional speaker in his underground floor with low level frequency coming out but I don’t know. Also if my bed vibrates from it would that mean whatever is making this noise be touching my house somewhere and it’s going through the structure.
The sound is loud and my ears are ringing from it. I have had my hearing checked out also.
Any input or questions are appreciated, thank you for your time
RE: Low frequency (maybe infrasound) between houses-expert advice needed
1) The neighbor who may (on purpose or not) or may not be making the noise.
2) The acoustics of sound propagation including generation (source), path (airborne, soil, or linked structure), and receiver (your detection and annoyance).
3) Mitigation of the sound/vibration level and annoyance.
It is complicated problem technically and possibly by your relationship with your neighbor.
Identifying and quantifying the sound source is the best place to start. Are you in the USA or someplace else on the globe?
Walt
RE: Low frequency (maybe infrasound) between houses-expert advice needed
This suggests it may be able to process signals and identify frequencies down to 5 Hz or so.
https://apps.apple.com/us/app/vibration-analysis/i...
I think you should almost be able to "count" 5 Hz "vibrations" when you are lying in bed.
Conversely, if you are really "hearing" a sound with your ear not quite touching the glass, and not "feeling" mechanical vibration at the window, that suggests the frequency is a bit higher, > 15 Hz.
This mechanical reed tachometer supposedly reveals single frequency vibration as low as 14 Hz or so.
https://www.amazon.com/Briggs-Stratton-19200-Tacho...
RE: Low frequency (maybe infrasound) between houses-expert advice needed
100% it’s the neighbour, I’m a foreigner living in an Asian country that does not like foreigners and they want me out of the neighborhood unfortunately. I suppose what I am really looking to find out is, is there something attached to my house via them or is it most likely from their place through the ground/air to mine. I know I won’t win this battle but I would like to find it if it is touching my place, I already discovered a hidden motion detector he has pointed at my bathroom (I have a big glass door there)
The country I am living in has minimal law against this type of frequency (more about loud noises like music) I also recently discovered there is companies here that do this yep of thing called “revenge companies”
I am moving but I want to see how much my privacy has been violated
RE: Low frequency (maybe infrasound) between houses-expert advice needed
Dan, the Apple iPhone app measures vibration and not sound. Sound/audio apps are available, but a good microphone is needed to get to low frequencies.
Walt
RE: Low frequency (maybe infrasound) between houses-expert advice needed
I want to ask, what is an example of the equipment if it is electronic. (Not music)
RE: Low frequency (maybe infrasound) between houses-expert advice needed
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Low frequency (maybe infrasound) between houses-expert advice needed
RE: Low frequency (maybe infrasound) between houses-expert advice needed
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Low frequency (maybe infrasound) between houses-expert advice needed
RE: Low frequency (maybe infrasound) between houses-expert advice needed
RE: Low frequency (maybe infrasound) between houses-expert advice needed
Anyway, I'd get a car mechanic's stethoscope. They have a rod on the end rather than a cone and are used to find engine noises inside engines through direct contact. They are inexpensive ($20 USD or less) and otherwise useful, so it's a handy tool. Then you can listen directly to the house, to the dirt, to his house if you aren't too obvious about it. Check the dirt at various distances to see how the sound level drops off to find the origin.
I had an intermittent loud hammering sound for a while. It turned out to be the gas meter in the basement; one of the pipes going to it was barely touching ductwork and, in the winter when gas demand was high and the basement and meter were cold they would touch, allowing some minor vibration in the meter to be efficiently turned to sound from the wall of the duct. Upstairs it sounded like a jack hammer going. In the basement the sound was confined inside the duct and it was a slight rattle.
RE: Low frequency (maybe infrasound) between houses-expert advice needed
What part of China are you are in? it is a remarkable country,
where even small cities can have ten million populations.
RE: Low frequency (maybe infrasound) between houses-expert advice needed
@3Ddave good suggestion, I thought of it before but he turns it off when anyone is near my place so it won’t work. Even when a pizza is being delivered it turns off for those few minutes until they leave. Reason is, if I called the police about the noise they have to hear it in my house first before talking to a neighbour. Mental
RE: Low frequency (maybe infrasound) between houses-expert advice needed
Just how are you monitoting the status of this sensor in real time?
RE: Low frequency (maybe infrasound) between houses-expert advice needed
It looks like your neighbor has THREE(?) AC units? Note that when multiple fans are running, there are often beat frequencies that get generated; perhaps that was the intent of your neighbor.
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm
RE: Low frequency (maybe infrasound) between houses-expert advice needed
RE: Low frequency (maybe infrasound) between houses-expert advice needed
One important thing to note is my neighbour is a professional acoustic/sound engineer..."
Perhaps you should ask your neighbor, as he has the equipment needed to detect and track down you complaint!
RE: Low frequency (maybe infrasound) between houses-expert advice needed
RE: Low frequency (maybe infrasound) between houses-expert advice needed
RE: Low frequency (maybe infrasound) between houses-expert advice needed
By the way - what is the plan? You cannot prove anything and they won't stop. Apparently the cops won't help anyway.
Did you say you are moving?
RE: Low frequency (maybe infrasound) between houses-expert advice needed
RE: Low frequency (maybe infrasound) between houses-expert advice needed
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm
RE: Low frequency (maybe infrasound) between houses-expert advice needed
RE: Low frequency (maybe infrasound) between houses-expert advice needed
1) Detailed questionnaire to define problem
2) Sound surveys indoors and outdoors to identify suspected sound sources, sound paths, and correlation between measurements and problem description
3) Recording sound monitors placed inside dwelling and outdoors near suspect sources
4) Quantify sound/vibration problem based on observations and measurements
5) Conduct special sound/vibration tests as needed to define specifications for noise control methods and materials
6) Noise/vibration control recommendations based on the actual problem findings
7) Sound surveys after installation of noise/vibration control
"my neighbour is a professional acoustic/sound engineer" Your neighbor may or may not have the environmental and noise control skills to perform the tasks listed. Make a friend and see if he/she can help with your problem. There are many people with exceptional hearing for low frequency and low amplitude sound combined with contributing annoyance factors. It is technically possible that the sound (if present) in your neighbor's dwelling is lower than yours and that he/she does not have the same annoyance. Nothing stated so far is convincing that it is "100% your neighbour".
Gas meters, piping and appliances can product unusual sound/vibrations. A "service technician" may not recognize anything wrong. Here is a sample noise issue: https://eur04.safelinks.protection.outlook.com/?ur...
Walt
RE: Low frequency (maybe infrasound) between houses-expert advice needed
I was just hoping for some professional input here as I would love to get some solid evidence, I’m moving but it’s heartbreaking that it’s easier for people to call me paranoid then believe me. It’s so cheap and easy to get this kind of equip these days
Once again the a-hole wins
RE: Low frequency (maybe infrasound) between houses-expert advice needed
Unfortunately the only evidence has be presented by someone named "Helpmeplz12341234"
Experts can only help with qualified facts.
RE: Low frequency (maybe infrasound) between houses-expert advice needed
Walt
RE: Low frequency (maybe infrasound) between houses-expert advice needed