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Combination-TV-receiver-and-teletext-processor-with-on-screen-message-capability

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Combination TV receiver and teletext processor with on-screen message capability

Details

Inventors: Kinghorn, John R.; Stevens, Jeremy R.; Tarrant, David R.;
Assignee: U.S. Philips Corporation (New York, NY)
Primary Examiner: Groody; James J.
Assistant Examiner: Grant; Chris
Attorney, Agent or Firm: Franzblau; Bernard

A television receiver includes a teletext decoder having a page memory (PM) into which teletext data is read from a data acquisition circuit (DAC) via an interface circuit (MIC) under control of a microprocessor (PRO). The microprocessor is also used to control functions of the television receiver and to cause on-screen display messages to be produced. When an on-screen display message is to be produced, the microprocessor sets a bit in the memory PM which causes a latch to be set which in turn causes a multiplexer (MUX) to apply data from an auxiliary memory (APM) to a character generator (CG). When the on-screen display message is to be deleted, the bit in the page memory is reset causing the latch to be reset and the multiplexer to apply data from the page memory to the character generator. This enables on-screen display messages to be applied to the character generator without losing any of the teletext data stored in the page memory.

DETAILED DESCRIPTION It is an object of the invention to enable the insertion and deletion of on-screen display messages over a teletext displayed page without an indeterminate delay in restoring the teletext information when the on-screen display information is deleted.
The invention provides a television receiver as set forth in the opening paragraph, characterised by selection means for selectively reading data from the page memory and the further memory to the character generator.
By selectively feeding data from the display memory and the further memory to the character generator, the display of both teletext data and on-screen message display data can be combined on the display screen such that the on-screen message display data overwrites the teletext page data.
However, since a full display page of teletext data is retained in the page display memory, the full teletext display data is immediately available as soon as the on-screen message display data is deleted.
Consequently, it is not necessary to wait for that position in the cycle of teletext pages where the relevant page information is transmitted to arrive before restoring the teletext display and the on-screen message display can be instantly inserted and deleted without affecting the availability of the teletext data for display.
The selection means may be controlled by data read from given locations of the teletext page memory.
This allows a simple latch circuit to control the operation of a multiplexer which selects the output from either the page display memory or the further memory.

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