Telephonic communications – Including aid for handicapped user
Patent
1993-09-30
1995-07-11
Chan, Wing F.
Telephonic communications
Including aid for handicapped user
379 98, H04M 1100
Patent
active
054328373
ABSTRACT:
A telecommunication device for the deaf is designed to operate under an enhanced TDD communication protocol. The TDD is capable of communicating with conventional TDDs operating under normal Baudot/Weitbrecht communications, but is also capable of communicating with a similarly enhanced TDD utilizing an enhanced protocol with a faster data transfer rate. The enhanced TDD is capable of signaling to another remote TDD through the use of a synchronization character that it is capable of enhanced TDD communications. If a similar synchronization character is received from the remote station, both TDDs can then switch to enhanced TDD communication with its advantages of speed and enlarged character set. The enhanced protocol permits increased functionality of the TTD terminals in providing machine-to-machine communication in a manner invisible to the TTD user. A machine-to-machine control character similar to the synchronizing character is used to designate such messages.
REFERENCES:
patent: 3507997 (1970-04-01), Weitbrecht
patent: 3896267 (1975-07-01), Sachs et al.
patent: 4451701 (1984-05-01), Bendig
patent: 4959847 (1990-09-01), Engelke et al.
patent: 5081673 (1992-01-01), Engelke et al.
patent: 5091906 (1992-02-01), Reed et al.
patent: 5121421 (1992-06-01), Alheim
patent: 5163081 (1992-11-01), Wycherley et al.
Colwell Kevin
Engelke Robert M.
Hilliard Jeffrey
Schultz Ronald W.
Vitek Troy
Chan Wing F.
Ultratec, Inc.
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