Sughrue, Mion, Zinn, Macpeak, and Seas
Method for developing a key signal for descrambling in television broadcasting
 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 descrambling of the picture at the decoder, even if noise or data error interferes with one or more of the signals. 
Pioneer Electronic Corporation
H H H
H04N H04N H04N
inventional inventional inventional
Yoshifumi Shigeru Ryuichi
Saeki Watanabe Todoroki