Video scrambling, audio masking and data transmission methods for wireless cable systems
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United States of America Patent
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-
Oct 22, 1991
Grant Date -
N/A
app pub date -
May 7, 1990
filing date -
May 7, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Video scrambling is accomplished by attenuating the video carrier during the horizontal blanking interval and/or by omitting horizontal sync pulses, vertical serration pulses and equalizing pulses. The method of scrambling can be dynamically changed, but this is done only at the change of scenes. Audio masking and data transmission is accomplished via phase modulation of the video carrier. At the receiver, timing signals for unscrambling video and unmasking audio are obtained from the transmitted data. The system addresses problems that exist in wireless cable systems, but are not present in cabled systems.
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