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393 Comments
- JimXugle, on 10/12/2007, -2/+169try it... open Audacity...
Generate > Tone
Waveform: Sine
Frequency: 18000.00
Amplitude: 1.00
*generate tone*
I can hear it... but then again, I'm a high school student. Apperently, my dog can hear it to becuase he flipped out when I played it.
And People don't use Vibrate becuase the vibrate function still makes noise (that the teacher can hear).
*loads sine wave onto phone* - soogy, on 10/12/2007, -6/+162The real link without blogspam.
http://www.metro.co.uk/weird/article.html?in_article_id=14031&in_page_id=2
Stupid bastards. Stop linking to your blogs if you provide no extra information, especially if you provide even less. - panique, on 10/12/2007, -9/+107Definitely a "stupid media elaboration". An adult-evading feature is standard on even the most entry-level phones, it's called "vibrate".
- warrenfalk, on 10/12/2007, -5/+77Possible to have a sound that teens can hear but not adults? Probably
Possible to have your cellphone's audio system make that tone, probably not. Mine will record, but can't play anything remotely close to the edge of my audible range, and I'm no teenager anymore.
I call BS - even if it is a funny idea - EBFoxbat, on 10/12/2007, -3/+71they do, can't you hear it?
- shortie446, on 10/12/2007, -7/+73That's Nuts! I wonder if this is actually real or if its a stupid media elaboration on something that isnt possible.
- dggeek, on 10/12/2007, -10/+74You have a phone that makes no sound when it vibrates? Kudos to you!
- Kitsune818, on 10/12/2007, -0/+5718KHz is well within accepted "normal" hearing limits. Most speakers will reproduce up to 20KHz and fall off sharply after that, and most digital compression ignores anything above that.
I had a full physical two months ago, and I can still hear to about 25Khz. And I'm 28.. it's all in genetics. And before anyone thinks that's great, I also wear glasses :)
Those "ultra-sonic" "pest repellers" are the most migraine inducing things I've ever come upon. My future mother-in-law has one in her kitchen to (supposedly) keep ants at bay, and I can't stand the thing.
Also, if you can hear a CRT television "whining" that's around 19KHz.. That's the oscillator circuit for the picture tube. Used to be very handy in the computer lab to be able to know when all the monitors were off without having to check each one. I used to amuse the teacher by "predicting" which ones were left on, but really I could just hear them if there were two or three still on. - p3ngu1n, on 10/12/2007, -1/+55...That's not even real.
http://www.snopes.com/business/genius/spacepen.asp - ipodman715, on 10/12/2007, -1/+43Direct link to 10 second sample frequency:
http://lm2005.googlepages.com/highfreq1.mp3 - BlindIrishman, on 10/12/2007, -2/+43Just tell them its your pacemaker
- NSMike, on 10/12/2007, -12/+53Pure genius. Kudos to the kiddies who turned this anti-teen device into an advantage.
- tizz66, on 10/12/2007, -2/+41Yeah it's real, our news covered it a fair bit when the Mosquito thing was first announced. Your hearing gets progressively worse around the age of 20, so if you play a sound on the edge of our hearing spectrum, unless you have perfect hearing you won't be able to hear it.
- chrisc2, on 10/12/2007, -6/+44Considering most people under 20 spend at least some time each day blasting their iPods into their ears, I doubt they can hear anything on the edge of the hearing spectrum either.
- blobzorz, on 10/12/2007, -9/+47I want that ringtone :D
- LiquidPenguin, on 10/12/2007, -1/+38Just a thought, but is the fidelity on most cell phones enough to reproduce such a sound?
- kneu1, on 10/12/2007, -3/+38Classrooms are pretty quiet - I am pretty sure teachers would be able to hear the "buzzing" noise from phones on vibrate mode.
- windex99, on 10/12/2007, -1/+33Cell phone vibrators are a lot stronger then they use to be, making them louder as well. In a quiet class room, the vibration is pretty loud.
- jordo75, on 10/12/2007, -0/+30I can hear it....Not bad for a 30 year old :)
http://www.bbc.co.uk/wiltshire/audio/mosquito_sound.mp3 - hexix, on 10/12/2007, -0/+26that is where the tone came from. It's even in the title of the story. The first two words in fact: "Teenager repellent"
- adml_shake, on 10/12/2007, -3/+28I like how you think!
- spartyms2, on 10/12/2007, -0/+24When using the Comcast DVR remote and the "All Off" button it sometimes leaves my TV on while turning the cable box off. Most people wouldn't even know as the screen goes completely black, but I can hear a high pitched whining from rooms away. For some reason I seem to be able to hear most appliances running while my roommates haven't the faintest idea what I'm talking about. I can hear the TV on, cable box, most electronic devices that we think of as running "silent". I'm sure I'm not the only one, as it's probably a somewhat common thing.
I'm assuming this ringtone is very similar to that. I usually find it more of a nuisance than a helpful trait. - davidleeroth, on 10/12/2007, -3/+27I created this with JimXugle's advice:
http://rapidshare.de/files/21292730/freq.mp3.html - desiv, on 10/12/2007, -39/+61Wouldn't vibrate mode work for this?
Reminds me of the story about NASA designing pens that could write upside down.
Russians used pencils. - eridius, on 10/12/2007, -0/+21I didn't know cell phones were capable of emitting frequencies that high
- zachtib, on 10/12/2007, -0/+21Generate > Tone
Waveform: Sine
Frequency: 18000.00
Amplitude: 1.00
*generate tone*
I'm 18, and I can't hear that. I get a very faint irritation in my ears, so I know that *something* is playing, but other than that... - 83457, on 10/12/2007, -0/+20@Kitsune818
I can sometimes hear tvs/monitors on the other side of the house. Usually someone turned off the cablebox and forgot the tv without even noticing. - inactive, on 10/12/2007, -1/+21@JimXugle
Are these the right settings? I tried this in Audacity and could hear it fine. I'm 30 and used to play the drums! - ketsugi, on 10/12/2007, -0/+20Are you sure about those settings? I can hear that just fine, and I'm 25 years old, and I've been destroying my hearing with Discmans, MD Walkmans and iPods for over 10 years now.
Maybe it's just my sound drivers converting that into an audible sound, who knows. - SystemHasFailed, on 10/12/2007, -18/+37Oh please... they're so dang smart why don't they pay attention in class and have the sense to turn their damn phones off... ;-P
- inactive, on 10/12/2007, -7/+25I really, really don't believe this at all.
- Nitro420, on 10/12/2007, -13/+30Could this be used against the teens... Like, could I walk around the local mall blasting a super loud version of this frequency and annoy all the under-20's.
- Gryffydd, on 10/12/2007, -5/+21@cacoe
The format is an issue if the compression scheme works partly by elimininating frequencies at the edge of the average human range. - KrazyA1pha, on 10/12/2007, -1/+16Wow, that's amazingly annoying. I'm 22, I've been in the Army for 4 years and to Iraq for a year. I'm not boasting, but pointing out the fact that I've fired quite a few loud weapons and assumed my hearing would be too poor to hear this. I think the 20 year and younger thing probably isn't true, but it certainly is at the edge of the hearing spectrum.
EDIT: I tried it again, and it's interesting to note that I can only hear it through my left ear. I guess that makes sense since I'm right-handed. *shrugs* - Misos, on 10/12/2007, -2/+15"Classrooms are pretty quiet - I am pretty sure teachers would be able to hear the "buzzing" noise from phones on vibrate mode."
I don't know where you went to school... seldolm was any classroom of mine "quiet." - inactive, on 10/12/2007, -0/+13looked up range of human hearing
15-20,000hz
used audacity to gen tone at 22,000 and 25,000 still heard it.
looked up range of my sound blaster live
30-15,000hz
could be the people that hear it dont have a sound card with enough range to get it outside of adult hearing. - Otto, on 10/12/2007, -0/+13Creating these sounds is easy. Load up your favorite sound editing program (Audacity) and make a tone that's above 16000 hz. Play it. Can you hear it? If so, raise it up and try again. The threshhold is different for different people.
MP3's and CD's and such are usually capable of storing sounds up to 22.5 khz, and most quality speakers can reproduce sounds at least up to 20 khz. Small speakers (like in a cellphone ringer) can sometimes emit the sounds without difficulty, takes some trial and error there.
However, most MP3 encoders cut off these high frequencies automatically, since most people can't hear them anyway. Quality encoders (like LAME) can be told to not do that, but generally there's a 17-18 khz cutoff point in most MP3 files. But the format is perfectly capable of storing it.
BTW, you know that sound that some CRT monitors make when they're on but have no signal coming in? That comes from the flyback circuit, and in the US, it's a 15734 Hz tone. So if you can hear that, then you can probably hear some of these high pitched sounds. - Frebis, on 10/12/2007, -6/+18i just put mine on vibrate. Not only can they not hear it...If properly placed it can be quite pleasurable.
- 15charmaxwtf, on 10/12/2007, -0/+12That 18khz sound sounds just like my television when its on standby.
- cwoolf34, on 10/12/2007, -1/+11*Laughs @ ringtone posted above (genre= blues in iTunes)*
- kalisphoenix, on 10/12/2007, -1/+11"A teacher will notice you staring at your crotch for prolonged periods of time. That's not natural behavior..."
It is in middle school. "Mmmm Veronica. Oh, Christ. The bell. *****. *****. *****. Damn it, why did I freeball today?" - edzieba, on 10/12/2007, -1/+11You are hearing the capacitors in the HV supply for the CRT charging and discharging at about 15750Hz. Anything that uses a 'switching' power supply (usually a smallish power brick. If it doesn't use a transformer, it's a switching PSU) will produce this tone (or a similar one depending on the voltages involved). Usually the sound is far too quiet to be audible, but with a high power device such as a TV, people with more sensitive hearing can detect it.
- ebob, on 10/12/2007, -2/+12A better way to repel obnoxious teenagers (and they are ALL obnoxious) would be to play old country music on the sound system in the store. A little George Jones or Merle Haggard and these brats will be running!
- KriTenKs, on 10/12/2007, -0/+9Wow, I'm 19 & i cant hear it (I had an ear operation when i was 4 so im not suprised). My winamp was set to repeat and so i kinda forgot it was playing. My little brother(13) takes one step into my room and says, "OMG! WTF is that noise!"
That is hilarious! Just thinking of how many little brats i can piss off on the bus makes me smile with glee. - drgori, on 10/12/2007, -0/+9Great, I probably just ruined my ears jacking up the volume on my headphones trying to hear that tone. Then again, since I couldn't hear it, I guess my ears are pretty much thrashed anyway.
- Chugga, on 10/12/2007, -0/+9One day will these kids wake up and not hear their cell phones ringing?
- JimXugle, on 10/12/2007, -2/+11The Article Says 18KHz to 20KHz... so the settings should be fine.
And I couldn't get the thing to play on my phone (Motorola V551 via Cingular)... it just sounded like silence.
... guess I'll just keep my phone on silent and check it every so often.
Here in PA, it's a state law that says "no phones in school"... people respect that as much as they respect the other rules: No Food in class, No drinks, Don't drive to school, and no profanity (Its funny... one of my teachers recently reguarded Juliet Capulet as a "Nacrofiliactic Emo Ho-Bag") - strictnein, on 10/12/2007, -0/+9Get off the computer and do your damn homework!
I kid!
I'm 25 and that is loud! - adml_shake, on 10/12/2007, -4/+13of all the places that need cell jammers...High school should probably be in the top three on the list.
- tizz66, on 10/12/2007, -3/+12I'm amazed at just how many people fell for that.
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