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Teletype TesterIn the United States, more than 12,000 homes of deaf people are equipped with a system that enables the deaf to communicate by telephone. It consists of a teletype machine hooked up to an "acoustic coupler." The deaf person taps out a message on the teletype keyboard and the acoustic coupler converts teletype pulses into audio signals that can be sent over phone lines. At the other end, another coupler reconverts the signals to activate the teletype's printer and provide a readable message. Though a boon to the deaf, the system presents a problem when something goes wrong. It is difficult to pinpoint the trouble because of the multiple units involved-the teletype's keyboard or its printer, the coupler's sending circuit or its receiving circuit. Finding the trouble is time-consuming and it usually involves removing the equipment from service, leaving the deaf person temporarily without communication. Seeking an answer to this difficulty, NASA's Biomedical Applications Team at Research Triangle Institute, North Carolina, circulated a problem statement to NASA field centers. Langley Research Center responded by developing a compactly-packaged portable Teletype Test Unit.
Document ID
Document Type
Date Acquired
August 23, 2013
Publication Date
February 1, 1979
Publication Information
Publication: Spinoff 1979
Subject Category
Technology Utilization and Surface Transportation
Distribution Limits
Work of the US Gov. Public Use Permitted.

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NameType 20070019729.pdf STI

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IDRelationTitle20070019711Analytic PrimarySpinoff 1979