Hearing Aids
T-coils can also be used to pick up magnetic signals, just as a microphone picks up an acoustic signal; the T-coil then sends the signal to the hearing aid circuit or processor for amplification. Sources are electromagnetic fields, such as computers, electric cables, mobile phones, electric motors, airplane equipment, etc. Many theatres and lecture halls are now equipped with assistive listening systems that transmit the sound directly from the stage; audience members can borrow suitable receivers and hear the program without background noise. The implant vibrates the skull and inner ear, which stimulate the nerve fibers of the inner ear, allowing hearing. Maintenance of these hearing aids and a regular supply of batteries is also provided, on payment of a small annual maintenance fee.
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