Abstract

Related Work

Architecture

        telephone

         |  ^
     DTMF|  |
         |  |voice
         |  |
         V  |

         T-311

         |  ^
    ASCII|  |
         |  |voice
         |  |
         V  |


        work-                        webpage dump
         station (where server runs) ------------->   tts
                                         voice
                                     <------------
         |  ^
         |  |
commands |  | webpage dump
         V  |
         LYNX

Modules

• Modem access module:
  Read in ascii commands from T-311 and write ascii commands to T-311.
  The ascii commands are converted from DTMF by T-311.
  Commands read from T-311 include all browsing commands, web addresses, modem line status info("RING", etc).
  Commands issued to T-311 include "ata"(answer call)and "ath"(hang up).
  
• Webpage processing module:
  Invoke "lynx" to dump a webpage located at a user's specified webpage. Preprocess the webpage dump: format the webpage text body and read in links
• Sound module:
  Invoke "tts" to read out a webpage. Kill a "tts" process when user interrupts reading by entering commands.
• Main command processing module:
  Process all commands pressed in by the user. Build data structures to handle navigating.

Program Functionality:

• Goto:
  '1'
  key-in web address in a non-ip-adress format:
  xxx.xxx.xxx/xxx/xxx
  The keying schemes is rather intricate, because we have to map the entire/necessary computer keyboard letters to the telephone keyboard.
  General form: '{0, -, 9, *, #}'(any button on the keypad) + '{0, 1, 2, 3, 4}'(index) + '{0, 1}'(lower_or_upper_case)
  The following description is also the online help you will hear:
  If you are already familiar with how to enter a web-address using your
  telephone keypad, you may enter a web-address at any time.
  You are not required to and should not enter HTTP colon slash slash.
  The keypad uses each key button to represent several characters.
  Each key button represents the characters written on its face except
  zero, one, star, and pound sign.
  For example, nine represents itself and WXYZ. To key in nine itself,
  press nine and zero and zero.
  The first zero indicates that you want to enter nine, which is the
  first character in the list of characters that nine represents.
  The second zero indicates that you want to enter a lower case character.
  To indicate that you want to enter a upper case character, press
  one.
  So for example, to key in upper-case W, press nine and one
  and one. The first one indicates that you want to enter the second
  character in the list of characters that nine represents.
  The third one indicates that you want the upper-case letter.
  Therefore, to key in lowercase W, press nine and one and zero.
  And so on.
  We use zero to represent itself.
  To key in zero, press zero and zero.
  We use one to represent one.
  To key in one, press one and zero and zero.
  We use star to represent itself, dot, slash, tilde, and colon.
  To key in star itself, press star and zero.
  To key in dot, press star and one.
  To key in slash, press star and two.
  To key in tilde, press star and three.
  To key in colon, press star and four.
  To key in the erase character, press star and five.
  To key in pound sign, press pound and zero.
  We also support shortcuts.
  To key in WWW, press nine, nine, and nine.
  To key in COM, press three, six, and six.
  To key in EDU, press three, three, and eight.
  To key in GOV, press four, six, and eight.
  To key in GOV, press four, six, and eight.
  To key in FTP, press three, eight, and seven.
  To signal the end of a web address, press pound and pound.
  
• Follow link #: '2' + #_of_link
• Go back: '3'
• Go forward: '4'
• Listen to current page again: '5'
• Listen to the links on the current page: '6' + #_of_link
• Use history list: '7': press in the number of URL to use.
  edit the url and goto that url.
  press '#' + '*' to cancel using the URL on the history list.
  
• Stop listening to the currently "playing" page: '8'
• Listen to help: '9'
• To switch mode between http and ftp:: '0'

Program Notes

Tasks

First Stage

Second Stage

References