Download Britannica Discovery Library Volume 8 - Sounds by Pamela Dell (Author), Kathryn Harper and Mark Domke PDF

By Pamela Dell (Author), Kathryn Harper and Mark Domke (Editors)

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A TDD user transmitting or sending over the ASCII code can process information about five times faster than when using the Baudot code; this speedier ASCII rate is called 300 Baud. The ASCII capability feature on a TDD also allows the user to have access to many personal computer bulletin boards. While the number of these bulletin boards are constantly changing, estimates range from 1,500 to 5,000. See also ELECTRONIC MAIL. LABYRINTHITIS. NICATIONS DEVICE FOR THE DEAF) bacterial meningitis See MENINGITIS; POSTNATAL CAUSES OF HEARING LOSS.

OUTER EAR. 7 million Australians have some degree of hearing loss. 1 percent of the population is profoundly deaf. Most of these deaf or hard-of-hearing Australians are elderly and began to lose their hearing after finishing school. Only about 40,000 were born with hearing problems or lost hearing early in life. In addition, conductive hearing loss is particularly high among the aborigines, since most native Australian children have chronic suppurative OTITIS MEDIA. Australia has the lowest prevalence rate of deafness among those developed countries for which statistics were available.

Basilar membrane A flexible membrane that is attached to the bony shelf and divides the coil of the COCHLEA lengthwise into two compartments. On one side of the membrane is the PERILYMPH fluid of the SCALA TYMPANI; on the other side is the ORGAN OF CORTI. As sound vibrations disturb the perilymph fluid, they are transferred through the basilar membrane to the organ of Corti and on to the hair cells inside. battery hearing aid See HEARING AIDS. Baudot code A code invented by Emile Baudot in 1874 that recognizes 32 characters—the capital letters of the alphabet and six other characters.

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