R&D Report 1977-26 : CEEFAX: evolution and potential J.R. Chew
The development of the CEEFAX information broadcasting system from initial work in 1966 to the end of the two-year experimental period in 1976 is described. The background to the choice of transmission and display parameters is given, together with details of laboratory and field experiments. Particular emphasis is given to the selection of the addressing and coding systems to give reliable reception throughout the normal television service area. The basis for the choice of the many supplementary facilities of CEEFAX, such as colour and graphics, is presented together with indication of the provisions made for future expansion in the use of CEEFAX.