Managing letterbox signals with logos and closed captions
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United States of America Patent
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Sep 6, 1994
Issued Date -
N/A
app pub date -
May 19, 1993
filing date -
Jun 1, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A video display control system comprises: a video display having a wide format display ratio; a letterbox detector for sampling video information in pictures represented by input video signals having a letterbox format and generating a control signal for enlarging the pictures for substantially filling the video display means with active video; and, a first control circuit for restricting operation of the letterbox detector to a vertical range of horizontal lines in each field of the video signal; and, a second control circuit for restricting operation of the letterbox detector to a horizontal range of video data in each of the horizontal lines.
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