TAMPER-RESISTANT, EXPANDABLE COMMUNICATIONS SYSTEM

申请公布号：WO8505523(A1)

申请号：WO1984US00766

申请日期：1984.05.19

申请公布日期：1985.12.05

申请人：

AM CABLE TV INDUSTRIES, INC.

发明人：DICKINSON, ROBERT, V., C.

分类号：H04N7/10;H04K1/00;H04N7/16;H04N7/173;(IPC1-7):H04N7/10

主分类号：H04N7/10

摘要：An expandable, multipurpose digital and analog communications system in which a plurality of remote interrogator units (215, 216, 117) connected in a branch of the systems are isolated from one another by band stop filters (222, 228) to permit simultaneous polling without interference with other operations. Also disclosed is a premium service control unit (Fig. 7) which makes use of a frequency agile oscillator (702).

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