Other Devices For Hearing Impaired
In addition to TDD, there are a number of pieces of equipment that can be coupled to telephones to improve their utility. For those with hearing difficulties the telephone ring and conversation sound level can be amplified or pitch adjusted, ambient noise can also be filtered. The amplifier can be a simple addition or through an inductive coupler to interact with suitable hearing aids. The ring can also be supplemented with extension bells or a visual call indicator.
Read more about this topic: Telecommunications Device For The Deaf
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—Abraham Lincoln (1809–1865)
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