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2. Telecommunications device for the deaf - Wikipedia

   en.wikipedia.org/wiki/Telecommunications_device...

   The specific GA and SK keys allow for speedier use of common abbreviations. A telecommunications device for the deaf ( TDD) is a teleprinter, an electronic device for text communication over a telephone line, that is designed for use by persons with hearing or speech difficulties. Other names for the device include teletypewriter ( TTY ...

3. Telecommunications relay service - Wikipedia

   en.wikipedia.org/wiki/Telecommunications_relay...

   A telecommunications relay service, also known as TRS, relay service, or IP-relay, or Web-based relay service, is an operator service that allows people who are deaf, hard of hearing, deafblind, or have a speech disorder to place calls to standard telephone users via a keyboard or assistive device. Originally, relay services were designed to be ...

4. Assistive Technology for Deaf and Hard of Hearing - Wikipedia

   en.wikipedia.org/wiki/Assistive_Technology_for...

   Hearing aids are electroacoustic devices which are designed to amplify sound for the wearer, usually with the aim of making speech more intelligible, and to correct impaired hearing as measured by audiometry. Some technologies also worth noting are cochlear implants and bone-anchored hearing aids (BAHA), which serve a similar purpose to hearing ...

5. Red box (phreaking) - Wikipedia

   en.wikipedia.org/wiki/Red_box_(phreaking)

   Red box (phreaking) A red box is a phreaking device that generates tones to simulate inserting coins in pay phones, thus fooling the system into completing free calls. In the United States, a nickel is represented by one tone, a dime by two, and a quarter by a set of five. Any device capable of playing back recorded sounds can potentially be ...

6. Video relay service - Wikipedia

   en.wikipedia.org/wiki/Video_Relay_Service

   t. e. A video relay service ( VRS ), also sometimes known as a video interpreting service ( VIS ), is a video telecommunication service that allows deaf, hard-of-hearing, and speech-impaired (D-HOH-SI) individuals to communicate over video telephones and similar technologies with hearing people in real-time, via a sign language interpreter .

7. Hearing loss - Wikipedia

   en.wikipedia.org/wiki/Hearing_loss

   1.33 billion / 18.5% (2015) [ 4] Hearing loss is a partial or total inability to hear. [ 5] Hearing loss may be present at birth or acquired at any time afterwards. [ 6][ 7] Hearing loss may occur in one or both ears. [ 2] In children, hearing problems can affect the ability to acquire spoken language, and in adults it can create difficulties ...