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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 called the TTY, which is ....

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.... 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 one person says, “Hello, this is Mike,” he uses the letter GA, which stands for, go ahead, to signal to the receiving party that he is finished typing. When either party wants ....