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| Safety unit actuating device |
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| Electronic timepiece |
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| Image recording apparatus with recording medium quanity detecting means |
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| Image transmission or encoding apparatus |
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| Telephone apparatus for invalidating incoming call signals during dialing |
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| Apparatus and method for facsimile transmission of synthesized images |
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| Facsimile apparatus with data transfer function |
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Telecommunication device operating under an enhanced TDD protocol
| Details |
Inventors: Engelke, Robert M.; Colwell, Kevin; Schultz, Ronald W.; Hilliard, Jeffrey; Vitek, Troy;
Assignee:
Primary Examiner: Chan; Wing F.
Assistant Examiner:
Attorney, Agent or Firm:
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. |
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DETAILED DESCRIPTION The present invention is summarized in that a telecommunication device for the deaf is constructed which is capable of operating an enhanced TDD protocol, the terminal commencing operation at the initiation of communication sequence by first transmitting to the remote terminal a synchronization sequence which was designed to be invisible under conventional Baudot protocols yet, if recognized by the receiving machine, will result in a handshake so that both machines can switch to the enhanced TDD protocol, thereby facilitating communications between the two terminals, or, if not so recognized, communications in a standard TDD protocol.
It is an object of the present invention to define an entirely new and enhanced set of protocols for TDD communications so as to greatly facilitate communications for the deaf and the hearing impaired, and to make their communications more analogous to audible human conversations.
It is another object of the present invention to define an enhanced TDD and protocol for its use which makes little or no hardware changes to present TDDs, and this makes it possible to easily re-fit existing TDDs to the new enhanced protocol.
It is an object of the present invention to design enhanced protocol for TDD operations which is efficient, swift, and implemented in such a way so as to maximize its ability to be retrofit into existing.
TDDs.
It is a further object of the present invention to enable TDDs operating under the enhanced TDD protocol to be able to support pseudo-duplex communication, so that both users can type simultaneously to the other, while data is transmitted without loss of characters by either station.
It is yet another object of the present invention to enable TDD communications to be conducted at higher speed, thereby permitting telephone charges to be lessened.
Other objects, advantages, and features of the present invention will become apparent from the following specification when taken in conjunction with the accompanying drawings
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