The Null Device

Posts matching tags 'mosquito'


The street finds its own uses for ultrasonic teenager repellants; now some enterprising hoodie-wearing troublemakers have apparently sampled them into mobile phone ringtones inaudible to teachers and authority figures, allowing them to text each other and organise happy-slapping parties and such in class with the teachers remaining none the wiser. Or so the Metro (a throwaway tabloid given out on public transport in the UK) says:

Schoolchildren have recorded the sound, which they named Teen Buzz, and spread it from phone to phone via text messages and Bluetooth technology.
A secondary school teacher in Cardiff said: 'All the kids were laughing about something, but I didn't know what. They know phones must be turned off during school. They could all hear somebody's phone ringing but I couldn't hear a thing.
I'm somewhat skeptical about this. Wouldn't the MP3 format's psychoacoustic compression algorithms wreak havoc with subtleties such as ultrasonic tones?

Anyway, I wonder how long until the Teen Buzz sound is heard in grime records, making the first form of teenage music that's actually (partly) inaudible to elders.

(via Boing Boing) gibson's law mobile phones mosquito 1


An inventor in Wales has invented a teenager repellant. It's a device that emits an annoying noise at a frequency only youths can hear; the youths then scatter, leaving the oldies in peace.

The device, called the Mosquito ("It's small and annoying," Mr. Stapleton said), emits a high-frequency pulsing sound that, he says, can be heard by most people younger than 20 and almost no one older than 30. The sound is designed to so irritate young people that after several minutes, they cannot stand it and go away.
At first, members of the usual crowd tried to gather as normal, repeatedly going inside the store with their fingers in their ears and "begging me to turn it off," Mr. Gough said. But he held firm and neatly avoided possible aggressive confrontations: "I told them it was to keep birds away because of the bird flu epidemic."
The problem is that it's only most, not all, people over 30 who are immune to its effects.
Andrew King, a professor of neurophysiology at Oxford University, said in an e-mail interview that while the ability to hear high frequencies deteriorates with age, the change happens so gradually that many non-teenagers might well hear the Mosquito's noise. "Unless the store owners wish to sell their goods only to senior citizens," he wrote, "I doubt that this would work."
The article describes other devices for keeping the young and disorderly at bay, including "zit lamps", which cast a blue light that accentuates acne, and the old standby, classical music.

(via Make) crime mosquito security teenagers 2

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