Method of scrambling and of unscrambling composite video signals, and
device for implementation
    21.
    发明授权
    Method of scrambling and of unscrambling composite video signals, and device for implementation 失效
    无缝拼接复合视频信号的方法和实现装置

    公开(公告)号:US5224161A

    公开(公告)日:1993-06-29

    申请号:US720517

    申请日:1991-07-08

    CPC classification number: H04N7/1675

    Abstract: In order to scramble as effectively as possible pay-television transmissions, the transmitter is made to transmit, at one and the same time, access messages and entitlement messages, all of them crypted and corresponding to a control word periodically loaded into a pseudo-random generator. In each receiver, the decoder comprises a control unit processing the various messages and sending them to a security processor which supplies a control word to the pseudo-random generator controlling the unscrambling.

    Abstract translation: PCT No.PCT / FR89 / 00579 Sec。 371日期:1991年7月8日 102(e)日期1991年7月8日PCT提交1989年11月8日PCT公布。 出版物WO91 / 07849 日期为1991年5月30日。为了尽可能有效地进行付费电视传输,发射机被同时发送访问消息和授权消息,所有这些消息和授权消息都被周密地传送并对应于控制字 加载到伪随机生成器中。 在每个接收机中,解码器包括处理各种消息并将其发送到安全处理器的控制单元,该安全处理器向控制解扰的伪随机发生器提供控制字。

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