Enhanced UK teletext: Experimental equipment for high-quality picture coding and other enhancements
Abstract
The construction of a pair of microcomputer-based units which will serve as a research tool in engineering teletext enhancements, one unit a transmitter and the other a receiver in a closed-circuit teletext transmission is described. The microcomputer system and frame store design is basically similar to that currently used by Logica in the Flair electronic graphics equipment. Considerable effort was devoted to the development of software handling. The units are equipped with a CP/M operating system, which is already widely known. This greatly simplifies the management of files and includes compiling routines and a software debugging tool. Software is being prepared in PASCAL. Routines were developed to receive, generate, edit and transmit teletext in its present form. Early attention was given to demonstrating that picture teletext is feasible through a crudely-coded slow-scan television system. An acceptable sampling structure for these pictures and optimizing the coding of data to fit in with a hierarchy of coding embracing other aspects of enhanced teletext, for example, geometric drawing, electronic painting and telesoftware are addressed. A high quality character font was incorporated to improve the display of text.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- July 1983
- Bibcode:
- 1983STIN...8333008R
- Keywords:
-
- Computer Graphics;
- Microcomputers;
- Receivers;
- Transmitters;
- Alphanumeric Characters;
- File Maintenance (Computers);
- Information Systems;
- Operating Systems (Computers);
- Program Verification (Computers);
- Software Tools;
- Communications and Radar