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Lower frequency sounds like the roar of a wind turbine are also out of the human hearing range and are often felt as vibrations rather than heard as sound. The person with this audiogram has a hearing loss in his left ear that prevents him from hearing sounds like the faucet or birdsong. Lower frequency sounds like the rumbling of a truck engine are easier to hear for the person with this audiogram.

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Introduction Ever wonder why some adults experience trouble with hearing as they get older? Hearing loss tends to become more severe as we age. But does hearing loss cause everything to sound uniformly softer or do certain sounds become harder to hear than others?

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A device emitting a soundwave which is designed to drive young troublemakers away from a problem area of Swindon has been hailed as a success. Listen to the sound online. The 'Mosquito' sonic deterrent device was installed by the Wyvern Theatre in an attempt to stop groups of up to youngsters from gathering around Theatre Square.

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Repelling kids from something that would keep them entertained and occupied I think the entertainment value they get from breaking into a park or rec center when it is closed is something we can reasonably deny them. And saying we can't chase them away from vandalizing the rec center because they'll go vandalize someplace else is, well.

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A sonic device is seen at top right at Barrett Playground in Philadelphia. Thirty parks in the city have the devices, which emit a constant, high-pitched noise that only teenagers and young adults can hear. In Philadelphia, 30 parks and recreation centers are outfitted with a small speaker called the Mosquito.

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Several young students have caught on to a recent trend: a ring tone that only they can hear and most adults can't. Dubbed the Mosquito, the noise stems from an antitheft technique in the United Kingdom, where it was used to deter youth crimes such as shoplifting. The idea is that most adults lose the ability to hear high-pitched sounds as they grow older, so this tone will reach the ears of only the young.

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Think you have perfect hearing? The low range of human hearing starts around 20 hertz, and tops out at about 20, [ PDF ]. By contrast, bats can hear ultrasonic sounds with frequencies up tohertz.

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T he Teen Buzz ultrasonic ringtones were created by teenagers so that they could be alerted to incoming text messages or calls on their cell phones without nearby adults becoming aware of it. These "secret ringtones" take advantage of the fact that as people age, they lose some of their hearing sensitivity, especially in the higher frequencies. So a high-frequency tone that is at the edge of audibility for most teenagers will be inaudible to many adults over age 20, and to most adults over the age of The tones are not, strictly speaking, ultrasonic, because they can be heard by normal, healthy young people, but they are sometimes called "ultrasonic" ringtones because they are above the frequency range of hearing for most adults.

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In that old battle of the wills between young people and their keepers, the young have found a new weapon that could change the balance of power on the cell phone front: a ring tone that many adults cannot hear. In settings where cell phone use is forbidden -- in class, for example -- it is perfect for signaling the arrival of a text message without being detected by an elder of the species. She played it for her first-graders.

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In that old battle of the wills between young people and their keepers, the young have found a new weapon that could change the balance of power on the cellphone front: a ring tone that many adults cannot hear. In settings where cellphone use is forbidden — in class, for example — it is perfect for signaling the arrival of a text message without being detected by an elder of the species. She played it for her first graders. All of them could hear it, and neither she nor I could.

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