Transmission of data with a video signal
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United States of America Patent
Stats
-
Aug 2, 1983
Grant Date -
N/A
app pub date -
Mar 23, 1981
filing date -
Mar 19, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The horizontal line synchronizing pulses of a video signal are selectively replaced with a video signal blanking level in dependence upon bits of data, whereby the data is transmitted with the video signal. Such data transmission is particularly applicable to a pay TV system in which the video signal is scrambled, because the selective absence of horizontal line synchronizing pulses enhances the video signal scrambling. In this case the data can comprise information relating to the scrambling of the video signal.
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