PICTURE DESCRIPTION INSTRUCTIONS PDI FOR THE TELIDON VIDEOTEX SYSTEM

Authors
  1. Bown, H.G.
  2. O'Brien, C.D.
  3. Sawchuk, W.
  4. Storey, J.R.
Corporate Authors
Communications Research Centre, Ottawa ONT (CAN)
Abstract
The Telidon Videotex system is a method by which information can be accessed from central data bases by the general public. By the use of a domestic home television receiver augmented by a micro-computer controlled interface device a user can access pages of graphical and textual information over a public common carrier communications facility such as the telephone network, a cable television line or the data may be even encoded into unused space in a broadcast television signal. In order to transmit information to a Telidon terminal, at minimum bandwidth, and in a manner independent of the type of communications channel, a coding scheme was devised which encodes a picture into the geometric drawing elements which compose it. The document provides a detailed specification of this code as well as a description of the principles which make it independent of communications channel and display hardware.
Report Number
TN-699-E —
Date of publication
15 Nov 1979
Number of Pages
73
DSTKIM No
80-00952
CANDIS No
88651
Format(s):
Hardcopy;Originator's fiche received by DSIS

Permanent link

Document 1 of 1

Date modified: