Telecommunication device operating under an enhanced TDD protoco

Details Telecommunication device operating under an enhanced TDD protoco Telecommunication device operating under an enhanced TDD protoco

1993-11-19

1996-05-14

Chan, Wing F.

Telephonic communications

Including aid for handicapped user

379 98, H04M 1100

Patent

active

055175481

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 synchronization character is especially designed so as not to interfere with the operation of a conventional TDD which might receive the character and also to be sufficiently distinctive so as to be capable of definite reception by enhanced TDD machines with minimum error.

REFERENCES:
patent: 3507997 (1970-04-01), Weitbrecht et al.
patent: 3896267 (1975-07-01), Sachs et al.
patent: 4959847 (1990-09-01), Engelke et al.
patent: 5091906 (1992-02-01), Reed et al.
patent: 5121421 (1992-06-01), Alheim
patent: 5134633 (1992-07-01), Werner

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