H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/25, 350/26
H04N 7/167 (2006.01) H04N 7/169 (2006.01)
Patent
CA 1328008
VIDEO SCRAMBLING BY SEGMENTING VIDEO INFORMATION LINES ABSTRACT OF THE DISCLOSURE 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.
546877
Katznelson Ron D.
Moroney Paul
Walker Gordon Kent
Cable/home Communication Corp.
Smart & Biggar
Titan Corporation (the)
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