Part one of term paper
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 short for Teletypewriter. Today, most people who use these machines call them ...

Part two of term paper
... obstacles. TDD machines are elemental and easy to use. When a deaf person wishes to call another deaf person, and when they both have TDD machines, the simply dial the telephone 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. ...