Method for developing a key signal for descrambling in...

Details Method for developing a key signal for descrambling in... Method for developing a key signal for descrambling in...

H - Electricity

04

N

350/26

H04N 7/16 (2006.01) H04N 7/167 (2006.01) H04N 7/171 (2006.01)

Patent

CA 1227560

ABSTRACT OF THE DISCLOSURE A scrambling method for TV pictures avoids deterioration of the reproduced picture by level compressing only selected horizontal flyback portions according to a randomly selected pattern to prevent synchronization at the receiver. Key signals are added repetitively to a plurality of horizontal synch signals in one frame so as to enable descrabmling of the picture at the decoder, even if noise or data error interferes with one or more of the signals.

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