Encoder/decoder of information upon/from a video signal
    33.
    发明授权
    Encoder/decoder of information upon/from a video signal 失效
    来自视频信号的信息的编码器/解码器

    公开(公告)号:US5386240A

    公开(公告)日:1995-01-31

    申请号:US933499

    申请日:1992-08-21

    申请人: Akihiro Hori

    发明人: Akihiro Hori

    IPC分类号: H04N7/08 H04N7/081 H04N7/16

    CPC分类号: H04N7/08 H04N7/081

    摘要: An encoder/decoder can insert and demodulate an information signal without affecting a video signal, the information signal being not analyzed, modified and deleted easily. The non-inverted and inverted information signals are inserted into two horizontal lines having a strong correlation in the same field or different fields separated by at least one field of the video signal. A difference of the inserted information signals is obtained by a combination of a delay circuit and a subtracter. Field difference signals Sx and Sy are applied to a band pass filter and are generated by a PSK generation circuit. Generated output signals Qx and Qy are converted into unit information by a majority decision logic circuit and are stored in a memory. A unit information group consisting of a predetermined number of stored bits is used to generate the meaningful information. The inserted information signal has a low level and is inserted in the video period and the unit information is generated by the field difference. Thus, the information signal cannot be analyzed, modified and deleted easily.

    摘要翻译: 编码器/解码器可以插入和解调信息信号而不影响视频信号,信息信号不被容易地分析,修改和删除。 将非反相和反相信息信号插入到由视频信号的至少一个场分离的相同场或不同场中具有强相关性的两条水平线中。 通过延迟电路和减法器的组合来获得插入的信息信号的差异。 场差信号Sx和Sy被施加到带通滤波器,并由PSK产生电路产生。 产生的输出信号Qx和Qy被多数决定逻辑电路转换为单位信息,并存储在存储器中。 使用由预定数量的存储位组成的单位信息组来产生有意义的信息。 插入的信息信号具有低电平并且被插入到视频周期中,并且通过场差产生单位信息。 因此,不能容易地分析,修改和删除信息信号。