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Natural Science Forum / Physics / Acoustics / April 2006MY FAMILY CAN'T SLEEP DUE TO ULTRASONIC SOUND
In the recent past, we have some problems with tenants who live upstairs of our house. On account of gross violations in the Rental Agreement and damage to property by a tenant we gave a notice to vacate and got the tenant out. One of the reasons we got this tenant out was because we kept hearing some weird high pitch noise at night and no one in my family could sleep properly for about 5 months. After this tenant was gone we were able to sleep well. We had rented the apartment to another tenant. For the first two months, all was well and then this weird high pitch noise problem came back and none of my family could sleep during any given night. We called the police regarding the noise problem but they were not of much help. What could we do to prevent this nuisance and harassment. It seems that the frequency of this noise is above 20 kHz and perhaps in the "ultrasonic hearing" range and is of varying type. I know that sonic frequencies above 50 kHz and upto 200 kHz are heard through the cochlea by by-passing middle ear which has a bandpass.to restrict high frequency. We had "warm nights" and that went away when we installed aluminum foil all over the ceiling. There are no defective transformers, no leaky boilers, no sonar equipment industries, or ultrasonic security systems in the neighborhood. Its just a tenant living on top of us causing this nuisance with a sonic weapon. I need help in this regard. My family consists of decent law abiding citizens and the only thing we had done were advises to tenants to abide with the rules and regulations specified in the Rental Agreement and whenever there is a breech, we call them to bring this to their attention. Now, we can't do it so as we don't have much strength to argue with them due to sleep deprivation by ultra sound or Super sonic noise at night. I would greatly appreciate if anyone could tell me how to nullify or eliminate this nuisance at night. I heard of Ultra sound jammer by talking to a dealer in ultrasound products but they are expensive and beyond our financial capacity. Someone told me to install plastic sheet on the ceiling or sound proof it with a drop ceiling. I would like to find out what is the practical method to eliminate this strange weird harassment. Tech On 3/13/06 5:48 PM, in article 1142300934.300977.165160@i39g2000cwa.googlegroups.com, "tech" <compuspecialist@gmail.com> wrote: > In the recent past, we have some problems with tenants who live > upstairs of our house. On account of gross violations in the Rental [quoted text clipped - 43 lines] > > Tech If you can hear it, it is not ultrasonic by definition. It is possible that there is a nonlinear process that is converting two (or more) ultrasonic beams into an audible sound. If so, you should be able to measure it. What have you done so far? How old are the members of your family. It is very unlikely that senior citizens could hear sound above 20kHz. Bill -- Ferme le Bush Thank you for your comment. I know that If ultrasound is coupled directly into the skull bone and reaches the cochlea without passing through the middle-ear, much higher frequencies (up to about 200 kHz) will be audible. This effect (sometimes called ultrasonic hearing) was first discovered by divers exposed to a high-frequency (50 kHz) Sonar signal. So, humans do have ability to hear dangerous forms of ultrasound. Please read this article on this site: http://biomag2000.hut.fi/papers/0121.pdf The real frequency of sound we hear in our apartment is about 100 kHz and one could hear it even if earplugs are used! In other words, the brain is getting this noise through the bones or through the skull and the cochlea is picking it up through the bones bypassing the middle ear, which has a band-pass to filter any noise above roughly 20kHz. The members of family are all healthy middle age people with a young daughter. She gets headaches from this nuisance. At first we experienced "warm nights"(which reminds me of a lyric in Cindi lauper's songs entitled "Time after time".) which caused us sleep deprivation. I installed aluminum foil to block any possible microwave propagation as I was getting interference on the Television sets and the electrons from the Cathode of the CRT Monitor were getting distracted as if a magnet is held close to the deflection plates. The problem of sleeplessness went away for about three weeks and we started hearing strong high pitch noise, which caused sleep deprivation again. I was able to generate a "white noise" so that the tenant could not locate our position in our apartment. This worked to a certain extend as they were not able to pinpoint our postions or presence in the apartment. But, the noise nuisance continues. I would appreciate if someone could tell me a counter measure to block this weird nuisance. Tech > On 3/13/06 5:48 PM, in article > 1142300934.300977.165160@i39g2000cwa.googlegroups.com, "tech" [quoted text clipped - 58 lines] > Bill > -- Ferme le Bush > I would appreciate if someone could tell me a counter measure to block > this weird nuisance. There are ultrasound microphones that can receive and measure ultrasound to 100 kHz, if it exists. It is best that it be measured before any recommendations can be made. Any other speculations is a waste of time, because some of the inferences made so far are beyond known acoustical facts. Angelo Campanella I know that there are wide-band condenser microphones made by Bruel & Kjaer. I was able to record this sound on a high-speed tape-recorder with a condenser microphone and then played it at normal speed. Even though the impedance of the speaker made limitations to hear the noise clearly I could know that there is a noise in the recordings. Sometimes, like the bifurcation of microwave, which produces components of lesser frequency, this super high ultrasonic sound (nuisance) produces audible noise when head is turned in certain direction. There is no such noise outside the apartment and thus we come to a conclusion that it is from the tenant upstairs as they walk on their floor to position themselves over wherever we are relocated within the apartment. It is known to Science that humans can hear some very high frequency ultrasonic noise above 50kHz through the skull and then through the cochlea. This is what they are doing to cause us sleep deprivation. Another thing we noticed was that when a water bottle is kept in the bedroom, it becomes all misty inside and there is a pressure build up within the bollte. Tech >I know that there are wide-band condenser microphones made by Bruel & >Kjaer. I was able to record this sound on a high-speed tape-recorder [quoted text clipped - 18 lines] > >Tech During an occurance, shut their power off. If it goes away, they there are possibilities. greg There were unusual power outages and large power spikes recently. During that time the noise stopped and we all slept well. It started happening after I posted this nuisance on the Internet. They had replaced a transformer or so recently and there are no power outages anymore. No matter who helped us to have sleep, we sincerely thank them. We would say that keep up the good work no matter where you are in the world. On 3/15/06 8:07 AM, in article 1142438854.219198.138300@j52g2000cwj.googlegroups.com, "tech" <compuspecialist@gmail.com> wrote: > It is known to Science that humans can hear some very high frequency > ultrasonic noise above 50kHz through the skull and then through the > cochlea. This is what they are doing to cause us sleep deprivation. It may be well known to some, but not to me. My understanding is that there are hairs in the cochlea, each connected to a nerve fiber and responding to a narrow band of frequencies. It beyond my comprehension that evolution would have ended up producing hairs in the cochlea that respond to 30kHz and higher if there were no survival benefit. Please give reference to documentation. Bill -- Ferme le Bush > On 3/15/06 8:07 AM, in article > 1142438854.219198.138300@j52g2000cwj.googlegroups.com, "tech" [quoted text clipped - 11 lines] > give reference to documentation. > Bill While the orignal poster is clearly either a troll or a nut case, his comment regarding the ability to perceive bone-conducted ultrasound is correct. Here are a couple of references: http://www.tinnitus.vcu.edu/Pages/Bone%20Conduction%20Levels.PDF http://www.tinnitus.vcu.edu/Pages/Bone%20Conduction%20Levels.PDF Additionally, airborne ultrasound can not be generated with sufficient intensity to create the auditory percept. Ultrasonic stimulation must be generated by a resonant piezoelectric transducer having a high mechanical impedance, and must be applied to the temporal bone (through the skin). Lastly, the auditory percept of bone-conducted ultrasound is that of a high-piched buzz rather than that of a pure tone, and the pitch of the buzz is relatively independent of the frequency of the ultrasonic signal, at least over the frequency range from 25KHz to 45KHz. To the best of my knowledge, no one presently knows either where or how bone-conducted ultrasound is converted into neural activity. The problem is solved, as I was able to immensely reduce the noise with sound proofing materials. Let me tell you this, after good night sleeps and no noises. All of the family members were subjected to ultrasonic echolocation and bone conduction of "ultrasonic hearing" by propagation of high frequency ultrasonic noise which is stopped now. One can imagine how desperate the imposters with invalid e-mail addresses trying to discredit a covert high tech attack on people. Tech. Thanks for your response. If ultrasound is coupled directly into the skull bone and reaches the cochlea without passing through the middle ear, much higher frequencies (up to about 200 kHz) will be audible. Divers exposed to a high frequency of Sonar sensor signal first discovered this effect (sometimes called ultrasonic hearing). I would like to know how to stop this nuisance. Tech > Thanks for your response. If ultrasound is coupled directly into the > skull bone and reaches the cochlea without passing through the middle > ear, much higher frequencies (up to about 200 kHz) will be audible. > Divers exposed to a high frequency of Sonar sensor signal first > discovered this effect (sometimes called ultrasonic hearing). > I would like to know how to stop this nuisance. You have been told that a possible mechanism that could lead to the perception of ultrasound would be direct mechanical contact. You have not described any such mechanical contact. Inaudible high frequency noise can lead to aural fatigue and a sense of discomfort, but you do not describe experiencing either. A likely audible or semi-audible generator of high frequency noise would be a CRT television set, but the noise is not loud enough to pass through a closed wooden door of even the thinnest possible construction. Another possible generator of high frequency noise appears to be "low power" "long lasting" ligth bulbs, at least I suppose that such are the cause of some 18 kHz noise I get on some concert recordings. That noise is however quite modest in level and also not likely to be able to penetrate even a thin door. I am not really sure the supposed noise making mechanism actually exists and it is certainly not a major issue. However if the noise observed on those recordings is actually from such light bulbs, then it just might be that some orientation light kept on at night might be audible of someone with extremely good high frequency hearing. A correcting action if confirmed would then be to replace such light with an LED lamp or similar or simply with plain old fashioned Edison type bulb. You might want to ask yourselves what it really is you dislike about your tennants. Perhaps you should simply smile and say a friendly "hi" when you meet them. I reckon you have them because they help you pay the cost of having the house, so you might as well thaw the colda tmosphere of unsaid things up with plain politeness and friendlyness. Having good relationships with ones neighbors also helps prevent feeling disturbed when they are occasionally audible. > Tech Kind regards Peter Larsen  Signature******************************************* * My site is at: http://www.muyiovatki.dk * ******************************************* I do't think that it is the hairs in the cochlea stimulates the nerves to have ultrasonic hearing. Ultrasound propagates through bodily fluid and bones and enters the ear via fluid channels such as the aqueduct and skull. The tip of the basilar membrane is hypothesized to be the resonant structure that moves in response to ultrasonic stimulation not the hair. Frequency discrimination may be by the bifurcation of the sound on objects and reflection when it comes to very high air bone Ultrasonic frequencies. The sleep deprivation may be done by echolocation of people and then coupling the sound directly on to the skull. I wont be surprised that some of the music we hear may be digitized at an ultrasonic sampling rate of 96 kHz to reproduce an audible bone conducted high pitch tweeter sounds along with base to perceive a better quality of music. Tech I do't think that it is the hairs in the cochlea stimulates the nerves to have ultrasonic hearing. Ultrasound propagates through bodily fluid and bones and enters the ear via fluid channels such as the aqueduct and skull. The tip of the basilar membrane is hypothesized to be the resonant structure that moves in response to ultrasonic stimulation not the hair. Frequency discrimination may be by the bifurcation of the sound on objects and reflection when it comes to very high air bone Ultrasonic frequencies. The sleep deprivation may be done by echolocation of people and then coupling the sound directly on to the skull. I wont be surprised that some of the music we hear may be digitized at an ultrasonic sampling rate of 96 kHz to reproduce an audible bone conducted high pitch tweeter sounds along with base to perceive a better quality of music. Tech I don't think that it is the hairs in the cochlea stimulates the nerves to have ultrasonic hearing. Ultrasound propagates through bodily fluid and bones and enters the ear via fluid channels such as the aqueduct and skull. The tip of the basilar membrane is hypothesized to be the resonant structure that moves in response to ultrasonic stimulation not the hair. Frequency discrimination may be by the bifurcation of the sound on objects and reflection when it comes to very high air bone Ultrasonic frequencies. The sleep deprivation may be done by echolocation of people and then coupling the sound directly on to the skull. I wont be surprised that some of the music we hear may be digitized at an ultrasonic sampling rate of 96 kHz to reproduce an audible bone conducted high pitch tweeter sounds along with base to perceive a better quality of music. Tech I don't think that it is the hair in the cochlea stimulates the nerves to have ultrasonic hearing. Ultrasound propagates through bodily fluid and bones and enters the ear via fluid channels such as the aqueduct and skull. The tip of the basilar membrane is hypothesized to be the resonant structure that moves in response to ultrasonic stimulation not the hair. Frequency discrimination may be by the bifurcation of the sound on objects and reflection when it comes to very high air bone Ultrasonic frequencies. The sleep deprivation may be done by echolocation of people and then coupling the sound directly on to the skull. I won't be surprised that some of the music we hear may be digitized at an ultrasonic sampling rate of 96 kHz to reproduce an audible bone conducted high pitch tweeter sounds along with bass to perceive a better quality of music. Thanks for understanding the nuisance we are having, namely, sleep derivation done by our tenants. Tech The problem is solved, as I was able to immensely reduce the noise with sound proofing materials. Let me tell you this, after good night sleeps and no noises. All of the family members were subjected to ultrasonic echolocation and bone conduction of "ultrasonic hearing" by propagation of high frequency ultrasonic noise which is stopped now. One can imagine how desperate the imposters were with invalid e-mail addresses trying to discredit a covert high tech attack on people. Tech. [Snip] Given that you posted this same message to 7 different groups (including alt.religion.scientology, alt.mindcontrol and hr.politics) I'm going to write you off as a troll (and a bad one at that) unless you can convince me otherwise - a name would be a good start. Bye. |
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