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Telecommunications Device for the Deaf (TDD) In 1963, Robert Weitbrecht developed a large acoustic coupler. This device has helped with breaking down the communication barrier between the Hearing and Deaf communities. This device today is call ....

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... and put the receiver on their TDD's cradle. A bright flashing light, at their residence alerts the person receiving the call. This light serves as a signal that they have a telephone call. The receiving person puts his telephone receiver on the cradle of his TDD machine and both parties begin communicating. While one party types the other party reads. Unfortunately, TDD machines only have half-duplex capabilities. This means that only one person at a time can type. On that account, people who use TDD machines use letters that represent word-signals, which aid in the process of keeping the conversation flowing. For instance, when ...