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- ''For other meanings of "ultrasound" or "ultrasonic", see ultrasound (disambiguation).
Ultrasound is sound with a frequency greater than the upper limit of human hearing, this limit being approximately 20 kilohertz (20,000 hertz).
Ability to hear ultrasound
Some animals, such as dogs, dolphins, bats, and mice have an upper limit that is greater than that of the human ear and thus can hear ultrasound. Children can hear some high-pitched sounds that older adults cannot hear, as in humans the upper limit pitch of hearing gets lower with age. This frequency limit is caused by the middle ear that acts as a low-pass filter. If ultrasound is fed directly into the skull bone and reaches the cochlea without passing through the middle ear, much higher frequencies (up to about 200 kHz) can be heard. This effect (sometimes called ultrasonic hearing) was first discovered by divers exposed to a high-frequency (ca. 50 kHz) sonar signal.Medical sonography
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Fri, 15 Aug 2008 19:54:36 -0000
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Nuderecords.com Ultrasound - News, biography, images, sounds, and tour information from the band's label.
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VH1: Ultrasound - Biography, discography, and links.
Meta Description: [ VH1.com presents complete artist information on Ultrasound, including news, bio, message boards, song clips, Urge Music Downloads, and more. ]
| ULTRASOUND Music Festival -Golan Levin with Zach Lieberman, Jaap Blonk + Joan La Barbara [US / Holland] / Stilluppsteypa ... | |
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