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1. 发明授权

US4945564A Process for the scrambling and descrambling of television images 失效
标题翻译：电视图像加扰和解扰的过程
公开(公告)号：US4945564A
公开(公告)日：1990-07-31
申请号：US293605
申请日：1989-10-05
申请人： Victorion Christian , Guionnet Jacques
发明人： Victorion Christian , Guionnet Jacques
IPC分类号： H04N7/169
CPC分类号： H04N7/1696
摘要： The useful signal of a sampled video line is, at least partially, spliced to two adjacent segments (AB, BC), each of which has at least two states. The splicing point (B) between the two segments is synchronously defined in a pseudo-random manner at transmission and reception. Upon transmission, at each line and in a pseudo-random manner, one of two possible scrambling schemes is selected. The first scheme involves local reversing of the second segment, and the second scheme involves a reversing of the second segment followed by a permutation with the first segment. Upon reception, the processing is the inverse of the processing which occurred at transmission and is applied in order to reintroduce intelligibility to the video signal. That is the locally reversed segments are received and reversed, following the permutation used at transmission. The process applies to a MAC signal.
摘要翻译：至少部分地，采样视频线的有用信号被拼接成两个相邻的段（AB，BC），每个段具有至少两个状态。两个段之间的拼接点（B）在发送和接收时以伪随机的方式被同步地定义。在传输时，在每一行和伪随机方式下，选择两种可能的加扰方案之一。第一方案涉及第二段的局部反转，并且第二方案涉及第二段的反转，随后是与第一段的排列。在接收时，处理是在传输时发生的处理的逆，并且被应用以便重新引入视频信号的可懂度。这是在传输中使用的排列之后，接收和反转的局部反转段。该过程适用于MAC信号。

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