Teletext decoder arrangement
AssigneeU.S. Philips Corporation
InventorDavid R. Tarrant
Life of this patent
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Abstract
A teletext decoder arrangement comprises a page memory (PM) operable under the control of a data acquisition circuit (DAC) for storing a teletext page to be displayed, and a background memory (BM) in which teletext data packets are stored in the order in which they are received, a scanning circuit (SC) being provided which, when a teletext page is requested, causes the data packets in the background memory (BM) to be scanned in the B reverse order to that in which they were received to locate the most recently received version of the required teletext page, and to cause the data packets of the required page to be output to the data acquisition circuit (DAC) in the order in which they were received for storage in the page memory (PM) and subsequent display.
Claims18
A teletext decoder arrangement for teletext transmissions comprising a page memory for storing data packets of said teletext transmissions corresponding to a teletext page, a background memory for storing data packets of said teletext transmissions as they are received and scanning means for causing the stored data packets of said background memory to be scanned to locate the data packets corresponding to a required teletext page, said scanning means including means adapted to scan the stored data packets of said background memory in the reverse order to that in which they are received to locate said data packets corresponding to said required teletext page.
A method of decoding teletext transmissions, comprising the steps of storing data packets of the teletext transmission corresponding to a teletext page in a page memory, storing data packets of the teletext transmissions as they are received in a background memory, scanning the stored data packets of the background memory to locate the data packets corresponding to a required teletext page, and scanning the stored data packets of the background memory in the reverse order to that in which they are received to locate the data packets corresponding to the required teletext page.
Dependencies are inferred from the claim text.