TTY stands for teletypewriter, a term that is commonly used to refer to the text communication systems employed by deaf or hard-of-hearing individuals. These devices allow individuals to communicate with others via text messages, rather than through spoken language.
TTY devices typically consist of a keyboard and a display screen, along with a modem that allows the device to transmit and receive text messages over a telephone line. Users type messages on the keyboard, which are then converted into electrical signals that are sent over the phone line to the receiving party's TTY device. The receiving party's device then converts the signals back into text, which is displayed on the screen for the user to read.
TTY devices are often used by individuals who are deaf or hard of hearing to communicate with others, including telephone operators, emergency services, and other individuals who may not be familiar with sign language. In some cases, TTY devices are also referred to as text telephones or TDDs (telecommunications devices for the deaf).
Overall, TTY devices play a crucial role in facilitating communication for individuals with hearing impairments, allowing them to connect with others in a way that would not be possible through spoken language alone.
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