Cunning pupils turn yob alarm into silent ringtone

[Undertaker]

yob-busting alarm using ultra high sound to drive teenage thugs from shopping centres has been hijacked to create inaudible classroom ringtones, it emerged today.

Techno-savvy school kids are getting away with using mobile phones in class through the creation of ringtones adults cannot hear.

British firm Compound Security has been praised by the police for its Mosquito device which was developed to stop teenage gangs hanging around outside shops.

Once installed on a building, it emits a high-pitched sound, like a constant insect buzzing, to drive the problem away.

It is highly effective because it cannot be heard by most people over the age of 20 but is deeply irritating to teenagers.

Now the youngsters have turned the tables by making high-pitched recordings which allow them to exchange text messages in class unheard.

Known as "Teen Buzz", it is spread from phone to phone via text message and blue tooth technology. Howard Stapleton, managing director of Merthyr Tydfil-based Compound Security, said he was "amazed" by the children's creativity.

He said he was aware that the Teen Buzz craze had been sweeping through the area's schools for up to eight weeks.

anyone got this tone?

[gunner]

Clever little fuckers...

[mcdee]

found something here http://forum.anothersite.co.uk/showthread.php?t=79245

[Undertaker]

Nice one, i won't ne able to try it until i get home, then again i wont be able to hear anything so gonna bring some kids round and annoy them, this should be fun


LOL

[whatnow]

hehe classic case.

[4me2]

ingenious

[Spennyboy]

I can hear all 3 tones - mum cant hear sod all.

Interesting....

[Erad]

I can hear all three, n my parents in their 50s can hear them too, maybe its my phone making them a bit off sound.

[cyprus]

I can hear all 3 tones - mum cant hear sod all.

Interesting....

Me too and Im over 20!

[Undertaker]

i'm working on some tones, with my cousins, i think ive hit the right frequency, if you can come into the chat room to test, then that would be cool.

i can barely hear it, im 24, but my cousin says its really loud.

testers welcome

df chat room

[tyenic]

i cant hear fek all

[yazooo]

I can only hear the first, very clever stuff! Now to annoy some teenagers!

[Undertaker]

Ok, here goes, the write up so far

the mosquito alarm system to drive yobs out of shopping centres work on a 17khz frequency, and its modulated, whereas the the tones doing the rounds are a constant 14.4khz

I think 14.4khz can be heard by over 20's so ive created the following

tone1 - works on a constant 14.7khz sine wave, barely detectable to me, and i'm 24 years old, but really annoying to my 16 year old cousins

tone2 works on 14.7, 15.7, 16.7 and 17.7khz, the frequencies are all combined, maybe it wont have the affect, but someone test these


i've converted to mp3, but i think it has messed with the higher frequencies, i can't test it, but someone let me know about these

therefore the zip contains both wav and mp3

if it works, then i might use it to get rid of kids round the corner, lol

please test with kids around

thanx

[Spennyboy]

Cant hear nothign on the Mp3 ones.

The wav files are working tho - tone2 is dangerous ... lol.

[Undertaker]

really, how loud it it?

[Undertaker]

right then, tone2 is a killer,

i've made it to 3 mins instead of 20 seconds,

is it possible to convert to mp3?

cheerz

[bbshark]

i can hear both the wavs but not the mp3s tried on the kids and they cant hear it eaither

[Undertaker]

Cleaned the thread up, re: zips


I've included the final two files after some tweaking,


have fun

tone1 - 14.7khz for 20 seconds

tone2longer - 14.7 15.7 16.7 and 17.7 khz, for 3 mins

tested tone2longer on spence and he reckons its driving him mad, so thats all from me for today

do have fun

ps: post your age, and what u can hear, some feedback would be great, so i can tweak some more

i think this has gone from yob alarm to ringtone, and hopefully now back to yob alarm lol

someone should try converting to mp3, also i don't know if tone2 will be playable on phones, because of the varying frequencies, i've left them on mono so hopefully it might work


EDIT

TONE2 is supposed to wind youngsters up, whereas adults hear a single tone

EDIT2

FIles are now encoded in mp3 format too


http://www.megaupload.com/?d=0XJENM4F

[DEC2K]

LMFAO my son who is 15 is sittin here next to me and i'm playin it through winamp lol he says wots that noise haha ha ha pi$$in mi self ha ha ha ingeiuos (spellin)
nice 1 undertaker ha ha ha still laffin

[marcode]

i can hear both of those in the zip.. will need to stick em on the mobile