Improved more cost-effective teletext - decoder with memory - and pages call buttons

摘要

The decoder is equipped with four (coloured) identified selection keys. The decoder provides two sequential exploration keys (+ and -), the function of which is determined by the selection carried out by way of one of the identified keys. The decoder has logic circuits (101,102,103,104,106,108,109,110). Depressing the keys gives the possibility of flipping through the pages belonging to one of the following groups; the selected group, the first pages of the groups, the first pages of the blocks, and the sub-pages belonging to the selected file.