公开(公告)号：US4499337A

公开(公告)日：1985-02-12

申请号：US404699

申请日：1982-08-03

申请人： Jorgen F. Elbaek

发明人： Jorgen F. Elbaek

IPC分类号： H04M1/60 ,  H04M3/523 ,  H04M1/00 ,  H04M19/04

CPC分类号： H04M1/6033 ,  H04M3/523

摘要： An electronic coupler for a microtelephone set (14, 31) for the coupling of an amplifier (2) in a telephone line (33a) to an operating position in a telephonist-operated switchboard with automatic call distributor comprises a coupling circuit (1) with a field-effect transistor which is coupled in parallel across the amplifier (2) in such a manner that, when the supply current (E+) is coupled to the amplifier (2), it has great impedance against incoming A.C. signals in the audio frequency range, for example a ringing signal, whereby the line (29a, 29b) is connected to the telephone cartridge (14) via the amplifier (2), and also that the coupler (1) has low impedance against incoming A.C. signals when the supply current (E+) is not coupled to the amplifier (2), so that the line (29a, 29b) is coupled (37) around the amplifier (2) and connected directly to the telephone cartridge (14). What is thus achieved is that the telephonist merely has to await an acoustic signal via the telephone cartridge (14), which indicates that there is an incoming call to be answered or put through to an extension, after which the telephonist applies voltage to the operating position by activating a switch and answers the incoming call. The construction and the dimensions of the coupler are such that there is substantially achieved impedance matching between the telephone cartridge (14) and the line (29a, 29b) in both coupling situations.

摘要翻译： 一种用于将电话线（33a）中的放大器（2）耦合到具有自动呼叫分配器的电话交换机中的操作位置的用于微电话机（14,31）的电子耦合器，包括耦合电路（1），其具有 场效应晶体管以这样的方式并联耦合到放大器（2），使得当电源电流（E +）耦合到放大器（2））时，其对于音频中的输入AC信号具有很大的阻抗 范围，例如振铃信号，由此线路（29a，29b）经由放大器（2）连接到电话盒（14），并且耦合器（1）在供电时对输入的AC信号具有低阻抗 电流（E +）不耦合到放大器（2），使得线路（29a，29b）围绕放大器（2）耦合（37）并且直接连接到电话盒（14）。 因此实现的是电话机只需要经由电话盒（14）等待声信号，该电话盒（14）指示有来话呼叫被应答或通过分机，之后电话机将电压施加到操作 通过激活交换机并应答来电。 耦合器的结构和尺寸使得在两种耦合情况下，电话盒（14）和线（29a，29b）之间基本上实现阻抗匹配。