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Apple Mobile Products: iPhone, iPad, iPod
iOS and Apps
Hearing assistance
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<blockquote data-quote="lbsimon50" data-source="post: 1901966" data-attributes="member: 402398"><p>Just a little bit off-topic. With age we all lose sensitivity to high frequency sounds. Mine happened around 66-68. There are devices that use this phenomena. I remember reading about phone message sounds that the kids in the classroom here, while the teacher does not. Or an opposite effect, such as a small convenience store that was pestered by teenagers. The owner installed powerful high frequency outdoor speakers that the adults would not hear and it would not bother them, while the teenagers had to leave the place.</p></blockquote><p></p>
[QUOTE="lbsimon50, post: 1901966, member: 402398"] Just a little bit off-topic. With age we all lose sensitivity to high frequency sounds. Mine happened around 66-68. There are devices that use this phenomena. I remember reading about phone message sounds that the kids in the classroom here, while the teacher does not. Or an opposite effect, such as a small convenience store that was pestered by teenagers. The owner installed powerful high frequency outdoor speakers that the adults would not hear and it would not bother them, while the teenagers had to leave the place. [/QUOTE]
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