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TDD/TTY

(Telecommunications Device for the Deaf/TeleTYpewriter) A user terminal with keyboard and printer or keyboard and screen used by the hearing and speech impaired. Introduced in 1964, the device contains a modem and is used over a standard analog phone line. If a recipient does not have a corresponding terminal device, TDD/TTY users dial a relay service composed of operators who receive the typed messages, call the recipients and speak the messages to them. The operators also type the responses back to the TDD/TTY user. See VRS.



VRS

(1) (Video Relay Service) A communications service for the hearing or speech impaired. A VRS is the video counterpart of a TTY relay service, in which the user types on a terminal, and the relay operator speaks the messages to the recipient (see TDD/TTY). In a VRS system, a videophone is used, and the user dials a VRS operator who is fluent in sign language. The operator dials up the recipient's telephone, views the signing over the videophone and converts it to speech. The operator also converts the responses back to sign language for the VRS user.

(2) (Video Reference Series) A family of video processing technologies from Anchor Bay Technologies, Inc. (www.anchorbaytech.com). See video processor.



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