Television receiver with teletext receiving function and a method for superimposing a teletext picture on a television picture
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United States of America Patent
Stats
-
Apr 28, 1992
Grant Date -
N/A
app pub date -
Mar 27, 1989
filing date -
Mar 28, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Teletext data stored in a video RAM is developed in a work RAM. A CPU selectively deletes picture elements from the developed teletext data, to thereby compress the teletext data into data adapted for display in an auxiliary screen which is e.g., 1/4 of the display screen of a CRT. The compressed teletext data is written into the video RAM. A display controller supplies the compressed teletext data stored in the video RAM to a synthesizing circuit, together with an appropriate display switching signal representing a timing for switching between the compressed teletext data and a TV broadcast video signal. In accordance with the display switching signal, the synthesizing circuit selectively supplies the TV broadcast video signal and the compressed teletext data to a video output circuit. Accordingly, the teletext picture compressed to a 1/4 size is displayed on the display screen of the CRT as an auxiliary screen image, while being superimposed on the TV picture.
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Family
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Cited Art Landscape
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