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    Teletext receiver
    1.
    发明授权
    Teletext receiver 失效
    图文电视接收机

    公开(公告)号：US4614972A

    公开(公告)日：1986-09-30

    申请号：US580535

    申请日：1984-02-15

    申请人： Roger Motsch ,  Claude Sechet

    发明人： Roger Motsch ,  Claude Sechet

    IPC分类号： H04N1/40 ,  H04N7/025 ,  H04N7/03 ,  H04N7/035 ,  H04N7/08 ,  H04N7/081 ,  H04N7/083 ,  H04N7/087 ,  H04N7/088 ,  H04N7/04

    CPC分类号： H04N7/0882

    摘要： A teletext receiver incorporating a demodulation circuit, a data demultiplexing circuit, a memory, a microprocessor and a numbering keyboard. The inventive receiver also comprises an early article acquisition decision circuit disposed between the demultiplexing circuit and the memory. This circuit incorporates a shift register with five cells, a storage module having a first group of three storage cells able to store three bytes, a second group of three storage cells able to store three bytes, a two-bit flip-flop, a logic comparison circuit incorporating a first group of three byte comparators, a second group of three byte comparators, an article start code detector, and a comparison synthesis logic circuit connected to the six byte comparators, to the detector and to the flip-flop. This circuit supplies an opening or closing control signal applied to the control input of the memory. The microprocessor loads in an appropriate manner the storage cells with bytes defining a page to be selected and bytes defining a threshold, such that all the articles whose classification bytes exceed this threshold, bring about the appearance of the memory opening signal. The microprocessor checks after each data transmission cycle the state of the memory in order to raise or lower the threshold, or leave it unchanged.

    摘要翻译： 包含解调电路，数据解复用电路，存储器，微处理器和编号键盘的图文电视接收机。 本发明的接收机还包括设置在解复用电路和存储器之间的早期文章获取决定电路。 该电路包括具有五个单元的移位寄存器，存储模块具有能够存储三个字节的第一组三个存储单元，能够存储三个字节的第三组存储单元，两个位触发器，逻辑 将第一组三字节比较器，第二组三字节比较器，文章起始码检测器和连接到六字节比较器的比较合成逻辑电路结合到检测器和触发器的比较电路。 该电路提供施加到存储器的控制输入端的打开或关闭控制信号。 微处理器以适当的方式加载具有定义要选择的页面的字节的存储单元和定义阈值的字节，使得其分类字节超过该阈值的所有商品导致存储器打开信号的出现。 微处理器在每个数据传输周期之后检查存储器的状态，以提高或降低阈值，或保持不变。

    Television system with access control
    2.
    发明授权
    Television system with access control 失效
    具有门禁控制的电视系统

    公开(公告)号：US4354201A

    公开(公告)日：1982-10-12

    申请号：US158499

    申请日：1980-06-11

    申请人： Claude Sechet ,  Gerard Babonneau ,  Louis C. Guillou

    发明人： Claude Sechet ,  Gerard Babonneau ,  Louis C. Guillou

    IPC分类号： H04N7/16 ,  H04K1/04

    CPC分类号： H04K1/00 ,  H04N7/166

    摘要： A television system with access control comprises a transmitter and receis. The transmitter comprises a video signal and sound signal formation circuit, means for transmitting these signals and a jamming circuit using a service key. Each receiver comprises means for receiving the transmitted signals, means for the display of the picture and for restoring the sound and an unjamming circuit connected to the reception means and working with the service key.It also comprises a subscription management center and in the transmitter a digital signal generator, a circuit for the formation of digital messages and a data broadcasting system and in the receiver a subscription card, an extraction circuit for the data, and a circuit for restoring the service key. There is also at least one subscription card loading station connected to the subscription management center.

    摘要翻译： 具有访问控制的电视系统包括发射机和接收机。 发射机包括视频信号和声音信号形成电路，用于发送这些信号的装置和使用服务密钥的干扰电路。 每个接收机包括用于接收所发送的信号的装置，用于显示图像和恢复声音的装置，以及连接到接收装置并且与服务密钥一起工作的非混合电路。 它还包括订阅管理中心，并且在发送器中，数字信号发生器，用于形成数字消息的电路和数据广播系统，并且在接收器中，订阅卡，用于数据的提取电路，以及用于恢复数据的电路 服务键。 还有至少一个订阅卡加载站连接到订阅管理中心。