Teletext device with reduced page-access time
First Claim
1. An apparatus for generating video text data carried on a television signal during a time interval of each field, said video text data including a plurality of magazines, each magazine including a plurality of numbered pages and numbered rows of text, comprising:
- a processor for deriving said text data from said television signal;
an input circuit for processing said text data;
a picture store connected to receive and store a selected page of said text data from said input circuit;
a background store connected to said processor for storing at least two pages additional to said selected page of said video text data;
a switch connected to deliver said text data from said processor, and said background store to said input circuit;
a control circuit connected to control said switch, whereby said input circuit receives either said processor text data or said background store data, and further connected to control writing of said background store; and
keyboard means connected to said control circuit from which to send a selected page number of said text data to said control circuit, whereby said control circuit identifies, in response to a single page selection, a magazine containing said pages to be written into said background memory, and said control circuit further identifies whether said processor text data or background store data is to be delivered to said picture store.
1 Assignment
0 Petitions
Accused Products
Abstract
Arrangement for receiving and processing digital signals in teletext or associated systems, comprising a picture store and a background store, the background store being arranged immediately after the source for the digital input signals such that output signals of the background store can be applied to the customary input circuit for further processing, while the picture store is arranged after this input circuit. The background store can store at least two but preferably a larger number of pages. Because of this implementation the waiting times occurring when new pages are requested are reduced to zero or substantially zero after the first request, while no additional control actions by the user are required.
15 Citations
17 Claims
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1. An apparatus for generating video text data carried on a television signal during a time interval of each field, said video text data including a plurality of magazines, each magazine including a plurality of numbered pages and numbered rows of text, comprising:
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a processor for deriving said text data from said television signal; an input circuit for processing said text data; a picture store connected to receive and store a selected page of said text data from said input circuit; a background store connected to said processor for storing at least two pages additional to said selected page of said video text data; a switch connected to deliver said text data from said processor, and said background store to said input circuit; a control circuit connected to control said switch, whereby said input circuit receives either said processor text data or said background store data, and further connected to control writing of said background store; and keyboard means connected to said control circuit from which to send a selected page number of said text data to said control circuit, whereby said control circuit identifies, in response to a single page selection, a magazine containing said pages to be written into said background memory, and said control circuit further identifies whether said processor text data or background store data is to be delivered to said picture store. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification