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20 条记录 (耗时 0.01 秒)

    Interrogated transponder system
    6.
    发明授权
    Interrogated transponder system 失效
    INTERROGATED TRANSPONDER系统

    公开(公告)号：US3757035A

    公开(公告)日：1973-09-04

    申请号：US3757035D

    申请日：1970-04-21

    申请人： SKIATRON ELECT & TELE

    发明人： SULLIVAN H

    IPC分类号： G08B26/00 ,  H04H60/21 ,  H04H60/32 ,  H04H60/43 ,  H04H60/96 ,  H04N7/173 ,  H04Q9/12 ,  H04N7/10 ,  H04N7/16 ,  H04Q9/00

    CPC分类号： H04Q9/12 ,  G08B26/00 ,  G08B26/003 ,  H04H60/21 ,  H04H60/32 ,  H04H60/43 ,  H04H60/96 ,  H04N7/17309 ,  H04N2007/17372

    摘要： A system, method and apparatus for selectively interrogating transponders which are located at remote stations connected to a central interrogating station. In one embodiment, a number of transponders which make up a final group within a larger group of transponders, all attached to a common line running from the central station, are selected and simultaneously caused to retransmit modified interrogation signals in accordance with certain informational characteristics and the identity of each transponder retransmitting. The final group of transponders chosen to be interrogated is selected by first sending a number n of tones of a larger group of tones m down a branch line to partially activate some of the transponders. These tones are followed by a smaller number of tones k chosen from the group n to which only the transponders in the final group respond. The system is particularly designed for use in a subscriber television network and specific circuitry for accomplishing the logical and electrical functions required are described.

    摘要翻译： 用于选择性询问位于远程站处的解码设备的方法。 在一个实施例中，选择构成最大组的多个应答器的多个转发器，其全部连接到从中心站运行的公共线路，并且同时导致根据某些信息特征重传修改的询问信号，并且 每个转发器的身份重新发送。 通过首先在分支线路上发送较大的一组音调m的数量n的音调以部分地激活解码设备中的一些，来选择包括选择要询问的各个解码设备的最后一组应答器。 这些音调之后是从仅有最终组中的解码装置响应的组n中选择的较小数量的音调k。 该系统特别设计用于用户电视网络，并且描述了用于实现所需逻辑和电功能的特定电路。

    Communications secrecy system
    7.
    发明授权
    Communications secrecy system 失效
    通讯系统

    公开(公告)号：US3689688A

    公开(公告)日：1972-09-05

    申请号：US3689688D

    申请日：1970-11-02

    申请人： SKIATRON ELECT & TELE

    发明人： SHANAHAN WILLIAM J ,  ZOPF VINCENT R ,  LOSHIN ALBERT M

    IPC分类号： H04N7/169 ,  H04N1/44

    CPC分类号： H04N7/1693

    摘要： 1. A decoder for use with a receiver in a secrecy system of the type in which at least part of the intelligence signals are scrambled, comprising means for employing at a given time a unique unscrambling code for decoding the scrambled intelligence signals, and means in the decoder for coding at least some of the intelligence signals during any of said given time in which no code whatsoever is employed to effect said decoding.

    摘要翻译： 1.一种用于与其中至少部分智能信号被加扰的类型的保密系统中的接收机的解码器，包括在给定时间采用用于解码加扰的智能信号的唯一解扰码的装置，以及 所述解码器用于在所述给定时间期间的任何一个期间对至少一些智能信号进行编码，其中不使用任何代码来实现所述解码。

    Scrambled television
    10.
    发明授权
    Scrambled television 失效
    屏蔽电视

    公开(公告)号：US3717206A

    公开(公告)日：1973-02-20

    申请号：US3717206D

    申请日：1970-11-02

    申请人： SKIATRON ELECT & TELE

    发明人： ZOPF V ,  SHANAHAN W

    IPC分类号： H04N7/169 ,  H04N1/44

    CPC分类号： H04N7/1693

    摘要： A TELEVISION SCRAMBLING SYSTEM IN WHICH THE VIDEO AND SYNCHRONIZING SIGNALS ARE TIME SHIFTED ON A RANDOMLY CODED BASIS. THE CODE IS PARTIALLY GENERATED BY PERIODICALLY OCCURRING COUNTER SIGNALS BEING RANDOMLY GATED TO AN ORDER SWITCH MATRIX WHICH IS MANUALLY CHANGEABLE TO ANY OF NUMEROUS AVAILABLE ORDERS FOR DIFFERENT PROGRAMS OF THE RANDOMLY GATED COUNTER SIGNALS, AND THE ORDERED SIGNALS ARE APPLIED BOTH TO A SET OF TONE GENERATORS AND A STORAGE SWITCH MATRIX. THE RESULTING TONES ARE TRANSMITTED TO CONVEY AN UNSCRAMBLING CODE TO RECEIVERS, WHILE THE SIGNALS IN THE STORAGE SWITCH MATRIX ARE MANUALLY CHANGED FOR DIFFERENT PROGRAMS TO CAUSE DIFFERENT SETS OF FLIP-FLOP OUTPUT SIGNALS WHICH ARE THEN MIXED BY ANOTHER SWITCH MATRIX AND APPLIED TO DIFFERENT VIDEO SIGNAL DELAY LINES FOR GATING SAME FOR TRANSMISSION.