| 摘要 |
Apparatus suitable for use with teletext display apparatus which is arranged to operate in a plurality of display modes, including a graphic display mode, in response to digital coded control signals, and to display in each mode digital coded data signals which provide the display information for the viewer. The digital coded control signals are interspersed among the digital coded data signals, with the result that no display information is normally available when a digital coded control signal is present, but the apparatus is so arranged that, in the graphics display mode, the digital coded, data signal which arrived immediately before the digital coded control signal is held over, and used to fill in the blank space that would correspond to the presence of the digital coded control signal. 'Hold over' is effected by arranging that a current data signal is held in a data store, and that the stored data is pushed out only by a subsequent data signal.
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