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1. 发明授权

US3742133A Monitoring system 失效
标题翻译：监视系统
公开(公告)号：US3742133A
公开(公告)日：1973-06-26
申请号：US3742133D
申请日：1971-09-15
申请人： SEABOARD SYS INC
发明人： O SULLIVAN J
IPC分类号： H04M11/02 , H04N7/18 , H04N7/02
CPC分类号： H04N7/186 , H04M11/025
摘要： The system is for use in an apartment house or other multi-unit dwelling and generally includes a central station which is preferably in the lobby of the apartment house and a plurality of unit stations, one being associated with each unit of the apartment house. The central or lobby station includes a plurality of manually actuable switches, one identifying each apartment unit, a television camera and a speaker/microphone arrangement for communicating with an occupant of the apartment house. Each unit station similarly includes a corresponding speaker/microphone arrangement, along with a lobby door release switch, a television receiver and a talk/listen switch. In accordance with the invention circuitry including relay and delay means are also located in the central station and unit stations. When one of the switches in the lobby is depressed and the television receiver in the corresponding unit is on, the video signal from the lobby camera automatically overrides the video signal of the tuned-in station regardless of which station is tuned-in and the occupant can immediately observe the lobby area to determine whether or not to actuate the door release switch.
摘要翻译：该系统用于公寓或其他多单位住宅，并且通常包括优选在公寓大厅中的中央站和多个单元站，一个与公寓的每个单元相关联。中央或大厅站包括多个可手动致动的开关，一个识别每个公寓单元，电视摄像机和用于与公寓的乘员通信的扬声器/麦克风装置。每个单元站类似地包括相应的扬声器/麦克风布置，以及大厅门释放开关，电视接收器和通话/收听开关。根据本发明，包括继电器和延迟装置的电路也位于中心站和单元站中。

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