Tesis

1
Design and Development of Several Mobile
Communication Systems for People with Hearing
Disabilities
Presented by José Luis Martín Sánchez
Department of Electronics. University of
Alcalá Authors José L. Martín Sánchez, Sira E.
Palazuelos, Jerónimo Arenas-García, Javier
Macías, Santiago Aguilera-Navarro
2
Index

• Introduction
• Automatic Interworking System
• SUMMA061
• Conclusions and future work

3
Introduction Text Telephones

• Special devices connected to the PSTN
• Display and keyboard
• There are two different types of text telephones
  in Spain

4
Introduction Mobile Text Telephones

• Increasing importance of mobile communications
  and Internet.
• Mobiles phones and deaf users?

5
Introduction Mobile Text Telephones

• YES, it is possible
• Standard platforms Nokia communicators,
  handhelds, etc.
• Provided, if needed, with a software application
• Text mobile telephone

6
Introduction Mobile Text Telephone

• Text mode and real time
• Communication between two mobile terminals
• Communication with a PC connected to PSTN via
  modem

7
Introduction Problems...

• Conventional text telephones use non-standard
  protocols
• Automatic Interworking System (AIS)
• SUMMA061

8
AIS System Requirements

• AIS provides text conversations between DTS and
  Nokia communicator
• The interface of communicators software should be
  preserved (unless strictly necessary)
• Telephone calls could be originated by any of the
  sides of the conversation
• AIS provides resources for up to 30 simultaneous
  conversations

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AIS Hardware Design

• AIS provides means of communication with
  terminals connected to GSM network (communicator)
  and PSTN
• AIS-Nokia communicator Internet, TCP/IP
• AIS-DTS PSTN, ISDN

10
AIS Software Design

• Multithread programming
• Object oriented. Modularity

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AIS Addition of new facilities

• AIS could receive sms from communicators and
  mobile phones, and read them to a conventional
  telephone
• Messages are written in the text telephone
  program and sent automatically to AIS, that will
  synthesize it to the hearing person
• Answer is implemented by DTMF tones

12
AIS Addition of new facilities
13
Introduction Problems...

• Conventional text telephones use non-standard
  protocols
• Automatic Interworking System (AIS)
• SUMMA061

14
SUMMA061 System Requirements

• The application must be absolutely robust to
  attend any kind of emergency call without hanging
  up. SUMMA061 should be fully integrated in the
  standard call center software
• The application should allow encoded recording of
  every call, storing the number phone, length and
  content of the conversation for later analysis.
• Application access should be protected by several
  access levels permissions.
• Lost calls must be easily recover.

15
SUMMA061 Software Design
16
SUMMA061 Software Design

• Although software design of SUMMA061 is simpler
  than AIS, different concurrent threads are
  necessary to handle the user interface and modem
  issues simultaneously.
• Main thread is in charge of coordinating user
  actions, user interface appearance and
  information received or sent to receiver and
  sender threads.

• Receiver and sender threads communicate with the
  modem and controls receive and send buffers.

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Conclusions and future work

• The systems we have presented have already been
  tested and have shown to be very robust in
  operation. We have used AIS for providing DTS-
  Communicator communication, and the possibility
  that deaf people send synthesized messages to non
  deaf ones.
• The addition of this second service has shown
  that our objective of creating a platform for
  hosting communication services for deaf people
  has been successfully reached.
• SUMMA061 is currenty being used in the Medical
  Emergency Call Center of Madrid.
• Due to the characteristics of the design that
  have been introduced, AIS and SUMMA061 are good
  frameworks for developing new communication
  services.
• We are working on getting a complete
  communication between deaf and non deaf people in
  a future. However, diffcult tasks involving
  speech recognition and synthesis (among others)
  must be faced in the way.

18
Thank you

• Thank you for your attention
• For further information
• Email to jlmartin_at_depeca.uah.es