The Use of RF Signals, Ultrasonic Waves, And Air Pressure To Transmit Audio - Page 1
Forum section: electronics / general

author: CuriousCreature
author_rank: Contributor
timestamp: December 25, 2024, 05:16:53 pm
content: Hey everyone, hope your well and happy holidays! Recently my family and I have been subject to a troll using some form of technology to speak to us in a way that seems to be in our ear as well as bouncing off certain rooms and areas of the house. I've been unable to block or stop the sound/transmission of audio and even when unplugging and sealing off all electronics it continues. This person has started saying they are going to molest children....kill people.... you get the idea. It doesnt even completely stop when surronded by wood and other shielding materials. Does anyone have an idea of how this is possible to be done and how to prevent, track, or neutralize it so it stops. They arent allowing my children to sleep and my youngest is saying he's feeling what seems to be an electric shock in his ear/on his body. Any help is appreciated.

author: ataradov
author_rank: Super Contributor
timestamp: December 25, 2024, 05:51:26 pm
content: Such things don't exist. Get carbon monoxide detector and see if you have a leak somewhere. Otherwise seek professional psychiatrist help.

author: CuriousCreature
author_rank: Contributor
timestamp: December 25, 2024, 06:21:21 pm
content: Ive recorded it and its documented at the hospital. It's transmittable audio coming from a speaker or being transmitted in a way that can be recorded, heard, and felt by multiple people. Terrible Comment.

author: ataradov
author_rank: Super Contributor
timestamp: December 25, 2024, 06:29:44 pm
content: One of what? Documented what?What you are describing is not technically possible. You need to look for possible reason elsewhere.

author: tooki
author_rank: Super Contributor
timestamp: December 25, 2024, 06:37:58 pm
content: Quote from: CuriousCreature on December 25, 2024, 05:16:53 pmWell it’s just that it’s incredibly implausible.“Air pressure” — what we perceive as sound is waves of air pressure. That’s simply the definition of sound.Ultrasonic sound can be used to make directed, audible sound. But this takes large, directional arrays that you must stand directly in front of or under, and they work only over a short distance — in fact, their real-world use is to make speakers whose sound doesn’t carry. They’re used in museums so that you can have videos playing with sound, but without that sound carrying even just 3 feet. (I’ve experienced these in person. There is absolutely no way you could install and use such a thing covertly.RF signals: not entirely impossible, but not practical.Note that we get some variation of “my neighbor is using X to torment me” posts once or twice a year, and they never, ever go anywhere, so we areextremelyskeptical of such claims.

author: CuriousCreature
author_rank: Contributor
timestamp: December 25, 2024, 06:41:10 pm
content: They have documented the occurrence of a piece of equipment capable of transmitting sound and causing harm and harassment to myself and my family. I've been able to record the sounds being transmitted but am unaware of the method used to transmit it as it doesnt seem to be soundwaves like you'd hear coming from a speaker. Its constant and doesnt change volume when moving around. It is 100% possible as I can already tell you methods on how to accomplish it on my own.Long Range Acoustic Devices (LRAD) could be a possibility. The transmission of rf signals carrying and transmitting the sounds and connecting them to receivers such as through auditory channels in phones, monitors, laptops, radio speakers etc. Obviously highly illegal but even though I dont have an extensive background in this area it is still not only obviously "technically possible" but happening. There is no other possible ways this could be occuring, its not a group delusion, or "a sign from god" as some lesser stable minded people would think. Myself, my family, and the groups of nurses also arent all exhibiting the same exact mental health symptom at the same time. Its a real, recordable, hearable, and actual transmission of sound being used to cause fear, harm, and harassment on myself, my wife, and my children.Let's refrain from avoiding the actual problem and making logical fallacies for something that isn't an everyday occurrence.

author: CuriousCreature
author_rank: Contributor
timestamp: December 25, 2024, 06:44:12 pm
content: I can see your point as its incredibly implausible, however there seems to be large groups of people who are experiencing this and calling it "electronic harassment". Even if you dont believe it to be happening or possible... if this were happening what steps would you take to A. Detect the method of transmission and B. Prevent and stop the transmission/method of sending the sounds.

author: ataradov
author_rank: Super Contributor
timestamp: December 25, 2024, 06:49:54 pm
content: Ok, let's assume there is some highly specialized and uncommon equipment that exists and targets you. Why do you expect people on the public forum to know how to neutralize it? People that know of such equipment will not be talking about it on the forums.Get a tin foil hat, it will help with RF.

author: CuriousCreature
author_rank: Contributor
timestamp: December 25, 2024, 07:00:14 pm
content: Alright buddy because you do not have the knowledge and thinking capacity to determine a way to detect how a sound can be transmitted you resorted to commenting the way you did. Also just to answer your question. EMF detectors , RF signal detectors, Microphones and software capable of analyzing the sounds and the frequency its being transmitted at. The use of copper, wood, and signal jamming equipment to prevent and block the signal/transmission are just the ways I can think of it off the top of my head. Thanks for showing the people you are incapable of thinking logically enough to solve an issue so you resort to sarcastic and quite frankly demeaning comments on a serious and potentially life threatening issue.

author: CuriousCreature
author_rank: Contributor
timestamp: December 25, 2024, 07:01:53 pm
content: Now lets "assume" other people are able to think more clearly and deeper about the issue than you. Why wouldn't they use their knowledge theyve garnered over the last few decades to solve a problem? Isn't that what over half the posts on here are for? Solving issues and learning about electronics and how they can be used in different ways to achieve a goal?

author: ataradov
author_rank: Super Contributor
timestamp: December 25, 2024, 08:23:09 pm
content: Sounds like you already know what to do, go buy all those detectors and start detecting things. Also, tin foil has is what you need to "block the signal".As has been said, we get people with mental health issues here a few times a year. It is always the same story. Eventually all of them get banned.

author: Buriedcode
author_rank: Super Contributor
timestamp: December 25, 2024, 08:39:20 pm
content: Quote from: CuriousCreature on December 25, 2024, 06:41:10 pmSo either post the recordings, or send them to the police. Are you asking on this forum what "such a device" might be? Are you asking for assistance in building one?If this person threatened your family, then call the police. Next time you talk to them, record the conversation so you have evidence of such. This sounds very much like a mental illness - delusions of persecution are quite common, and sadly, because one instinctively feels it is reality, it is very hard to persuade someone of even the possibility that it isn't real.We really are trying to be kind - before you start investigating the possibilities of such events, and the technical aspects - gather evidence that the events are actually occuring, which you will need to convince anyone. If you can't find evidence of this - I'm talking about actual audio recordings of someone threatening you or your family - then consider that it simply isn't happening, and seek help.

author: CuriousCreature
author_rank: Contributor
timestamp: December 25, 2024, 08:57:02 pm
content: 3 second clip with one transmission captured. Currently recording and analyzing more in audio software to make it audible.

author: CuriousCreature
author_rank: Contributor
timestamp: December 25, 2024, 09:01:45 pm
content: Clearly asking how a transmission can be made like this. This is what a 80 dollar microphone picked up. Its in the entire house and when not being recording they start mocking, saying violent threats, and sexual comments to hurt people. My youngest is experiencing electric shocks on his ears and areas of his body that are making him cry. More on the way.

author: hwasti
author_rank: Contributor
timestamp: December 25, 2024, 09:10:42 pm
content: Alex is right.As described, it is not physically possible using any means any of us are aware of.But...How much stock are you willing to put on the description being accurate and complete? Keep in mind, not only has the OP acknowledged that they are not knowledgeable, but they have also demonstrated that by trying to shield RF with wood.Is the person living in a standalone house or a small apartment? I can see an upstairs neighbor putting a speaker against the floor and it being heard everywhere in the apartment below. In my days of living in apartments, I have been woken up enough times by my neighbors' amorous activities, as well as their polar opposite, to know that sound carries well enough between apartments without any amplificationCan someone gain access to the house? They can hide speaker(s) connected to a receiver somewhere that is not obvious. Off the shelf Bluetooth speaker will work quite well for that and any remotely technical person can handle setting that up.Bottom line is that if you assume that the explanation is inaccurate, incomplete, wildly exaugurated or likely all 3, you can come up with a few ideas.But Occam's Razor points elsewhere.Unfortunately, if someone can destabilize their target a little bit, the victim can often start seeing threats where they don't exist, creating a positive feedback cycle that leads to them unraveling themselves quite effectively, even when the aggressor has stopped.

author: ataradov
author_rank: Super Contributor
timestamp: December 25, 2024, 09:13:22 pm
content: Can you record more than just 2 seconds of you fumbling with the microphone? Leave the recording running and leave the house. Publish the part where nobody is home.And yes, if you are in an apartment, then things will travel. This is one of the reasons I left the apartment and moved into a standalone house. But it was pretty obvious that the noise is TV probably mounted on the wall and the sound travels though the walls.But you would assume that a reasonable person would suspect that rather than sonic weapons. I feel like everyone who lived in apartments experienced that and certainly by the time you have grown kids.

author: CuriousCreature
author_rank: Contributor
timestamp: December 25, 2024, 09:16:46 pm
content: https://youtu.be/SmfNy2O_N2Ehere you go

author: CuriousCreature
author_rank: Contributor
timestamp: December 25, 2024, 09:18:46 pm
content: Its an actual house with more than 20-25 feet of distance inbetween the others. Suburban. This is coming from every corner, vent, and amplifies when putting your ear close to the wall and objects that soundwaves can bounce from.

author: ataradov
author_rank: Super Contributor
timestamp: December 25, 2024, 09:19:37 pm
content: What type of microphone? How was it setup? How was the recording done and at what gain levels?The muffled background sound will sound like subwoofer in the next apartment. But the sharp knocking is clearly you handling the mic. And the wind is well, just that - wind.

author: CuriousCreature
author_rank: Contributor
timestamp: December 25, 2024, 09:19:42 pm
content: Its an actual house in the suburbs with more than 20-25 distance in between each house. Also wood can block rf signals at higher frequencies.

author: CuriousCreature
author_rank: Contributor
timestamp: December 25, 2024, 09:21:48 pm
content: Recording using a hyperx microphone for recording, also used a phone plug in microphone by onn but it would just pick up static like it was being interfered with (i believe rf signals). Placed on a desk in the middle of the room away from vents, electronics and outside sound, the bang at the beginning was me being frustrated and throwing a bottle down. The sound/whoever is doing it reacts to every sound I make including swallowing, footsteps, creaks in the floor etc.

author: CuriousCreature
author_rank: Contributor
timestamp: December 25, 2024, 09:23:07 pm
content: Do you not clearly hear the static voice speaking? thats not a subwoofer and im not in an apartment. Its broken and static communication being transmitted. It literally sounds like an old woman saying "I wanna talk to you/ touch you."

author: ataradov
author_rank: Super Contributor
timestamp: December 25, 2024, 09:23:20 pm
content: RF at high frequencies will be blocked by your house. Or you suspect that this mega weapon transmitter is inside?Sometimes sounds like this can come from broken machinery. Like a fridge compressor or a sump pump.

author: ataradov
author_rank: Super Contributor
timestamp: December 25, 2024, 09:24:25 pm
content: Quote from: CuriousCreature on December 25, 2024, 09:23:07 pmNo, I do not hear anything like that in the 13 second clip.All I hear is improper mic handling.

author: CuriousCreature
author_rank: Contributor
timestamp: December 25, 2024, 09:25:25 pm
content: Its being used as a weapon but if I had to guess its probably the size as a smartphone or smaller and capable of transmitting at long distances when tuned to the right settings. The room is dead silent. It is clearly someone talking like through a bad signal walkie talkie. If youre just trolling at this point and cant hear it, replay and turn up the volume or go to an audiologist for hearing loss. The banging is not me its literally the sounds being transmitted.

author: hwasti
author_rank: Contributor
timestamp: December 25, 2024, 09:26:13 pm
content: After listening to your recordings, here's my recommendation:You need to call the producers of the various haunted house shows on cable TV. They will set up the house with more advanced electronics that you can ever manage. Either they will get to the bottom of it, or they will finally find a genuinely haunted house.Good luck.

author: CuriousCreature
author_rank: Contributor
timestamp: December 25, 2024, 09:27:22 pm
content: Disconnect from headphones. It literally changes the way it sounds. I just tried with connected headphones and unplugging them and playing it directly through my monitors speaker. Please listen with different methods.

author: oPossum
author_rank: Super Contributor
timestamp: December 25, 2024, 09:28:11 pm
content: Audio Pareidoliahttps://www.livescience.com/health/neuroscience/why-do-people-hear-their-names-being-called-in-the-woodshttps://en.wikipedia.org/wiki/Pareidolia#Auditory

author: CuriousCreature
author_rank: Contributor
timestamp: December 25, 2024, 09:28:16 pm
content: The mic isnt being touched its placed in the middle of a desk standalone.

author: Someone
author_rank: Super Contributor
timestamp: December 25, 2024, 10:41:27 pm
content: Quote from: CuriousCreature on December 25, 2024, 06:41:10 pmThat would be breaking the laws of physics, and only able to be approximated with an enormously large source which would also cover a significant area (unable to be targeted and uniform without some implausibly large source array as mentioned above).Quote from: CuriousCreature on December 25, 2024, 06:41:10 pmSo do explain this, rather than talking about everything else.

author: Someone
author_rank: Super Contributor
timestamp: December 25, 2024, 10:44:51 pm
content: Quote from: CuriousCreature on December 25, 2024, 09:01:45 pmAh, the Sasquatch method. Conveniently avoids all forms of recording and just when its "safe" reappears every time.

author: Analog Kid
author_rank: Super Contributor
timestamp: December 25, 2024, 11:00:18 pm
content: If you really want to convinceanyonethat what you say you're experiencing is real and not just some paranoiac construct of yours, you're going to have to post something more substantial than that 13-second clip. A longer clip that clearly contains some kind of message, a voice, something recognizable as speech.All I hear is someone fumbling around with a microphone. Sorry, not credible.

author: Analog Kid
author_rank: Super Contributor
timestamp: December 25, 2024, 11:03:49 pm
content: Quote from: hwasti on December 25, 2024, 09:26:13 pmAh, but when they turn up nothing the OP can always say "See! They [the perpetrators of the harassment]knewthey were being recorded so they went silent!"."They" are always all-seeing, all-hearing, all-knowing ...

author: Analog Kid
author_rank: Super Contributor
timestamp: December 25, 2024, 11:20:19 pm
content: This is quite similar to the so-called "Havana syndrome" where US "intelligence" agencies claimed they were being bombarded with hazardous radiation by a "foreign adversary" which caused psychological, and in some cases even physical, harm.It has been pretty thoroughly debunked, by none other than ... US "intelligence" agencies.In other words, it was always bullshit.One of the likely causes of the "syndrome" turned out to be ... crickets!

author: SiliconWizard
author_rank: Super Contributor
timestamp: December 25, 2024, 11:24:41 pm
content: When all you hear are crickets, it's usually not a good sign anyway, though.

author: SteveThackery
author_rank: Super Contributor
timestamp: December 26, 2024, 12:41:15 am
content: Quote from: CuriousCreature on December 25, 2024, 09:23:07 pmNO!! There is no voice! There's a lot of noise arising from the mic being handled, and then something that sounds like a front end being overloaded and limiting.Please make us a proper recording where we can hear some actual speech and STRICTLY NO rattling and banging from handling the mic. Put the mic down somewhere, move away from it (even better, leave the room), stand absolutely still and stay completely silent for a good minute so we can hear the actual sounds in the room instead of you messing about with the microphone.

author: Andy Chee
author_rank: Super Contributor
timestamp: December 26, 2024, 01:12:15 am
content: I don’t know if it’s the same troll;https://www.eevblog.com/forum/rf-microwave/what-are-they-using-on-me/

author: antenna
author_rank: Frequent Contributor
timestamp: December 26, 2024, 01:12:42 am
content: I have experienced strange auditory phenomenon due to the geology under our house causing certain sounds like traffic on highways a mile away to seem loud in the house while being hardly heard outside.Set up three recording devices. Go to the geometric center of the three microphones and snap your finger to serve as a synchronizing pulse, then using audio editing software, use time difference of arrival (the time difference between the sync pulse and a common noise spike from the offending sound) to locate its source.

author: EEVblog
author_rank: Unknown
timestamp: December 26, 2024, 02:08:44 am
content: Quote from: Andy Chee on December 26, 2024, 01:12:15 amThis is at least the 3rd and maybe 4th time with a similar topic.

author: SiliconWizard
author_rank: Super Contributor
timestamp: December 26, 2024, 04:35:24 am
content: Merry Christmas!

author: RJSV
author_rank: Super Contributor
timestamp: December 26, 2024, 05:05:53 am
content: Can you specify the 'Hospital' location, in the U.S. I assume?Most, if all areas have LAWs requiring a hospital to report abuse and threats.What manner did you 'report' this ? By email to the hospital ?Are you experiencing pyscosis right now ?Calling 911, or have you reported suspected threats, to a child ? (You could be in legal trouble if you have neglected to report the threats, as it's other people involved).OR, are you, falsely, reporting threats, to this forum ? THAT as well, could land you in front of a judge.Please provide your State and County location, so someone reading can report yourself.

author: Analog Kid
author_rank: Super Contributor
timestamp: December 26, 2024, 05:09:12 am
content: Quote from: RJSV on December 26, 2024, 05:05:53 amWhat are you going on about? There's no hospital.Did you even read the original post?

author: RJSV
author_rank: Super Contributor
timestamp: December 26, 2024, 05:18:50 am
content: ...The first recording (the short 2 seconds) sounds like a FART. Is there a projected smell, or any sort ?(Don't worry about my time, here,...strictly voluntary, and I'm not in a serious mood).- - - Rick-Jack

author: SteveThackery
author_rank: Super Contributor
timestamp: December 26, 2024, 08:24:53 pm
content: Time to lock and/or delete this thread, I reckon.

author: Analog Kid
author_rank: Super Contributor
timestamp: December 26, 2024, 08:47:25 pm
content: Quote from: SteveThackery on December 26, 2024, 08:24:53 pmWhy?My sense is since the OP seems to have abandoned this thread (confirming that this is probably a troll), it'll probably just peter out sooner than later.

author: Buriedcode
author_rank: Super Contributor
timestamp: December 26, 2024, 09:59:19 pm
content: With the possibility of a genuine concern (either because of the unlikely event its true, or, more likely, mental illness) I don't think its appropriate to take the piss. Sure, we get trolls, but I doubt someone is going to make something like this up for a few posts on a random forum about electronics.To the OP: ataradov's initial reply is blunt but spot on - like all his posts - if there was some kind of technology for this sort of thing, it wouldn't be used against a random member of the public, by a nefarious neighbour. The fact you beleive there is, combined with what you claim are really quite severe threats against you and your family really does make it seem like a persecution delusion, which isn't trying to trivialise it because it can be debilitating and consume your thoughts completely.Please try to assume that there is no malice in this, and start a recording for longer - perhaps a few hours. Then cut it down so there are clips that youbelievehighlight the phenomenon you think its happening, then post the clip butdo not tell us what you think you are hearing or what is being said. The reason is - if you ask 50 people what they hear when you play static, you'll get 50 different anwers. If you ask them if they hear something specific and tell then wha tyou hear, more than half will say "yes".And once again, see a doctor. We're not just talking mental illness, could also be a genuine problem with your hearing that you're misinterpretting. For the sake of your own health and safety, and the safety of your family, consider this option.Edit: Again, repeating ataradov - get a carbon monoxide monitor - just like that famous reddit post about the guy finding threatening messages around his house. It was chronic CO poisoning. If your heating system is old, get it checked out. A common early warning sign is chronic severe headaches that pretty much everyone in the house will experience.

author: coppercone2
author_rank: Super Contributor
timestamp: December 26, 2024, 10:20:27 pm
content: Well hospitals are not security agencies they know how to fix a burn not deal with whatever crazy shit.If this is not complete bunk, I suggest going to a ENT doctor to get your various cavities checked out for infection, often if something is stuck, inflamed, clogged there is undue pressure and it causes various problems. Those various expensive scans are no substitute for a visual inspection.I had years of pressure headaches (made me into a defacto rain/snow predictor) go away when I finally sprung something in the ear through jaw movement through intense laughter, now I can't tell at all if its going to snow and had maybe 2 headaches in the past year rather then the usual 15+. No one found anything ever and suggested basically pharma voodoo. Much like the case of the broken PCB, there was some sort of mechanical problem. It hurt like a total bitch for a day where I could basically not speak without pain after something got pulled, but since then it feels normal, no more occasional clogged ears in the morning or anything shitty like that. It feels like 'cold' when you finally fix it, followed by what feels like a hit on the elbow.

author: tszaboo
author_rank: Super Contributor
timestamp: December 26, 2024, 10:32:58 pm
content: Quote from: CuriousCreature on December 25, 2024, 09:23:07 pmMan, you need help, but not from us.Please turn to a mental health professional.

author: antenna
author_rank: Frequent Contributor
timestamp: December 26, 2024, 11:10:28 pm
content: Quote from: CuriousCreature on December 25, 2024, 09:21:48 pmThe perp can hear you swallow???For that to be possible, he must have extremely good microphones in your house monitoring you. The logical solution is to play white noise or something that can obscure your activities, like swallowing and foot steps, and to see if the responses to them continue. If you logically eliminate the possibility for the suspect to know what your are dong and the events continue, that will serve as good evidence that these effects are in your head. I have a friend that often hears music and evil voices, and he gets a shot each month to fix that

author: vk6zgo
author_rank: Super Contributor
timestamp: December 27, 2024, 12:19:32 am
content: Quote from: CuriousCreature on December 25, 2024, 05:16:53 pmFirstly, there is a group who are dedicated to the welfare of people who hear voices:https://www.hearingvoicesusa.org/hvn-usa-groups-list/list/1Secondly, do you live very close to a high powered AM broadcast station?I used to work at such a station, & in some parts of the site, very small arcs between induced voltages & earth, or magnetostriction effects would cause a constant low level "mumbling", which was just discernible.It was much more obvious at the base of the "Vertical radiator" (antenna) but there were other spots where, due to poor earthing on metals, you could hear the "mumbling".Back then it was easily discerned as radio, because music sounded very different to speech, but nowadays, with many stations going to 24 hour "talk shows", it would be mostly speech.Of course, it would be obvious if you lived next door to such a station----the 400 foot or so guyed tower would be a giveaway!!The site in general, would be very large to produce enough power for such minor side effects--a Ham or CB-er next door couldn't do so.The obvious test is to go out, & see if the voices follow you----if they do, they are "in your head", as nobody, or country, for that matter possesses the techology to follow you around & do what you describe.The other thing is that your recordings contain no intelligible sounds, which tends to suggest you should contact the group I have linked above.

author: SteveThackery
author_rank: Super Contributor
timestamp: December 28, 2024, 11:47:48 am
content: Quote from: Analog Kid on December 26, 2024, 08:47:25 pmWhy? Because this forum is not the place to advise on mental health issues. It's supposed to be about electronics, yeah?