Television receiver with multistage teletext decoder using priority scheme

摘要

A television receiver for receiving data signals, particularly teletext, associated with a television signal, has a page memory (13) for storing a plurality of pages for display on a display screen. In order to use the memory with maximum effectiveness, a queue is formed in order of priority of requests for allocation of memory locations for storing pages. Various features, such as FASTEXT, TOP, EPG, WST level 2.5, each require a certain minimum number of pages to allow the feature to be achieved. Each feature has a dedicated page request generator (PG-1 to PG-n) which each provide an ordered list of page requests. These page requests are fed to priority setter (P) which allocates for each of the page request generators, a given priority based on a priority scheme (PS) and a list of connected page request generators (PGL). The page request generators (PG-1 to PG-n) react to system events source (S1), broadcast event sources (S2), and/or user event sources (S3). This enables the easy addition or deletion of features.