System for enabling TDD communication in a telephone network and method for using same

• US 6,763,089 B2
• Filed: 10/12/2001
• Issued: 07/13/2004
• Est. Priority Date: 10/12/2001
• Status: Expired due to Fees

• Current Assignee: RPX Clearinghouse LLC (RPX Corporation)
• Original Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Inventors: Feigenbaum, Shelli D.
• Primary Examiner(s): CHAN, WING F
• Application Number:
  US09/976,721
• Publication Number:
  US 20030072420A1
• Time in Patent Office: 1,005 Days
• Field of Search: 379/52, 379/93.17, 379/88.12, 379/88.14, 379/93.18, 379/93.24, 379/93.26, 379/93.28, 379/88.04, 704/271
• US Class Current: 379/52
• CPC Class Codes: G09B 21/00 Teaching, or communicating with, the blind, deaf or mute audible presentation of material to be studied G09B5/04; devices or methods for replacing direct visual or auditory perception by another kind of perception A61F9/08, A61F11/04; audible indication of meter readings or of colour G01D7/12; watches for blind persons G04B25/02; speech analysis, speech recognition G10L; sound-recording or reproducing, per se G11B

Abstract

A system and method for enabling telephone network subscribers using a telecommunications device for the deaf (TDD) to communicate with other network subscribers lacking such a device. The TDD user dials a number that connects them with an automatic relay switch (ARS). The ARS determines the intended recipient of the call and establishes a connection to them. The TDD user then transmits a message in TDD format to the ARS, which converts it into an ASCII text file that is in turn provided to a text-to-speech (TTS) engine that synthesizes a voice message from the text file. The voice message is then sent to the non-TDD-enabled subscriber. The ARS then preferably prompts the non-TDD-enabled subscriber to enter a response. The response may be made by voice communication or by using the telephone keypad to send dual-tone multi-frequency tones back to the ARS according to instructions that were provided to the called party for this purpose. The instructions may take the form of a menu of options that is either standard or customized according to instructions previously received from the TDD user. The ARS process the response, converting it to a TDD format and transmitting it back to the TDD user.

Claims

1. An automatic relay system (ARS) for enabling communication between a telecommunications device for the deaf (TDD) user and a voice telephone user through a public telephone network, the system comprising:

an interactive voice response (IVR) system coupled to the public telephone network for enabling network users to interact with the ARS;

a TDD resource coupled to the IVR for sending and receiving communications in TDD format; and

a converter coupled to the TDD resource for converting messages between TDD format and text format; and

a speech processor coupled to the converter,

wherein the IVR system determines a path in the network to a target message recipient and establishes a network connection for the transmission of translated messages.

2. The system according to claim 1, further comprising a data storage device for storing prerecorded messages.

3. The system according to claim 1, wherein the speech processor comprises a text-to-speech converter for converting text formatted messages into speech, so that a speech message can be transmitted to the voice telephone.

4. The system according to claim 3, wherein the speech message is a translation of a TDD format message received from the TDD.

5. The system according to claim 1, wherein the speech processor comprises a speech recognition engine for receiving voice communications from the voice telephone and converting them to a text format.

6. The system according to claim 5, further comprising a data storage device for storing the voice communications in text format.

7. The system according to claim 6, wherein the IVR system includes a processor for directing that the voice communication in text format be retranslated into a voice message and sent to the voice telephone to confirm it is satisfactory to the user.

8. The system according to claim 1, wherein the IVR system causes an instructional message in the appropriate format to be sent to the target recipient upon establishing contact.

9. A method of enabling TDD communications in a telephone network, the method comprising:

providing an ARS accessible to a TDD;

receiving a TDD request in the ARS to set up a call to a specified voice subscriber;

determining in the ARS a path in the network to the voice subscriber;

automatically establishing a connection with the voice subscriber;

receiving a message in TDD format from the TDD;

translating the received message into a speech format; and

transmitting the translated message to the voice subscriber.

10. The method according to claim 9, further comprising sending a pre-recorded voice greeting upon establishing contact with the voice subscriber.

11. The method of claim 9, further comprising:

determining whether the voice subscriber is available; and

transmitting a TDD notification to the TDD if the voice subscriber is not available.

12. The method according to claim 11, further comprising prompting the TDD to specify an alternate voice subscriber.

13. The method according to claim 11, further comprising automatically selecting an alternate voice subscriber.

14. The method according to claim 9, wherein translating the message comprises:

converting the TDD message to ASCII format; and

providing the ASCII formatted message to a TTS engine for conversion to speech format.

15. The method according to claim 14, further comprising transmitting to the voice subscriber a prerecorded message providing instruction on how to respond to the speech format message.

16. The method according to claim 15, wherein the instruction includes a plurality of options from which the voice subscriber may select by causing a DTMF tone to be generated by a voice telephone.

17. The method according to claim 15, further comprising:

receiving a DTMF tone from the voice subscriber;

formulating a TDD response message corresponding to the responsive DTMF tone;

transmitting the TDD response message to the TDD.