Browse Prior Art Database

ASCII CHARACTER ENCODING SCHEME FOR TOUCH-TONE TELEPHONES

IP.com Disclosure Number: IPCOM000006563D
Original Publication Date: 1992-Aug-01
Included in the Prior Art Database: 2002-Jan-15
Document File: 3 page(s) / 101K

Publishing Venue

Motorola

Related People

H. Suarez: AUTHOR [+3]

Abstract

The ASCII Character Encoding Scheme eliminates the need for Teletype-style terminals to send ASCII code to a paging terminal.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 50% of the total text.

Page 1 of 3

MOTOROLA INC. Technical Developments Volume 16 August 1992

@

ASCII CHARACTER ENCODING SCHEME FOR TOUCH-TONE TELEPHONES

by H. Suarez, R Bodet and J. Johnson

  The ASCII Character Encoding Scheme eliminates the need for Teletype-style terminals to send ASCII code to a paging terminal.

  The idea is to enable any telephone system to send ASCII code to a paging terminal by utilizing the touch- tone telephone keys. The paging terminal can then trans- late the ASCII code to alpha-numeric characters and special symbols found in Teletype-style keyboard. Each ASCII character would be associated with a key combi- nation. For example, to encode alpha characters we can take advantage of the alpha characters found on the tel- ephone key pads (Figure I). The whole ASCII table (Fig- ure II) can be encoded using this approach.

To encode a character, a minimum of two keys must

be used. Each combination will represent an ASCII char- acter. Figure III shows a proposed ASCII touch-tone equivalent matrix. Example I illustrates the use of the proposed matrix.

  In order to enable the ASCII mode through the tele- phone, an entry code must be supplied first i.e. an aster- isk.followed by the pound symbol (*,#) or any other special access code. The reverse code (#,*) can be used to return to the normal (numeric) mode of operation. For the case of special symbols, an overlay can be placed on top-of the soft keys allowing the user to tind the code faster. Again a minimum of hvo keys are required to encode a special symbol. Other characters not found in this ASCII table can also be incorporated by extendin...