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。