Television – Nonpictorial data packet in television format – Including teletext decoder or display
Patent
1993-01-08
1995-01-31
Groody, James J.
Television
Nonpictorial data packet in television format
Including teletext decoder or display
348473, 348563, H04N 708, H04N 7087
Patent
active
053862384
ABSTRACT:
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.
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Kinghorn John R.
Stevens Jeremy R.
Tarrant David R.
Franzblau Bernard
Grant Chris
Groody James J.
U.S. Philips Corporation
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