Video scrambling by segmenting video information lines
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United States of America Patent
Stats
-
Apr 5, 1988
Grant Date -
N/A
app pub date -
Sep 19, 1986
filing date -
Sep 19, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system for scrambling a video signal having a plurality of horizontal lines, each of which includes a video information portion and a non-video information portion. The scrambling system includes a memory; means for storing the video information portion of each video signal line in the memory; and means for forming scrambled horizontal lines by retrieving each of a plurality of said stored video information lines in a plurality of segments preceded by a non-video segment and separated by non-video segment(s). The retrieval means include means for varying the respective durations of the retrieved video information segments in individual scrambled horizontal lines in accordance with an encryption keystream; and means for varying the total duration of the non-video segments for individual scrambled horizontal lines in accordance with a predetermined timing pattern. A complementary descrambling system also is disclosed.
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