| 摘要 |
A method of caching teletext page data in a memory unit (21) of a teletext receiver system, comprises receiving and storing in the memory unit (21) data representing a sequence of teletext pages embedded in a signal belonging to a first one of a plurality of channels; and subsequently receiving and storing in the memory unit (21) data representing a sequence of teletext pages embedded in a signal belonging to a further one of the plurality of channels, whilst keeping at least some of the previously stored teletext page data stored in the memory unit (21), wherein for each received teletext page, it is determined whether the memory unit (21) has capacity available for storing the received teletext page data representing the received teletext page, and for each stored teletext page, information is stored associating the stored teletext page data representing the page with the channel to which the signal in which that teletext page data was embedded belongs. The method is characterised by, upon determining that the memory unit has insufficient capacity, substituting the teletext page data representing the received teletext page for teletext page data associated with at least one different channel.
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