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    • 58. 发明授权
    • Electronic hybrid circuit for connecting a two-wire line to switching
system
    • 用于将双线线路连接到交换系统的电子混合电路
    • US4086447A
    • 1978-04-25
    • US769247
    • 1977-02-16
    • Hans Rudolf SchindlerPeter Vettiger
    • Hans Rudolf SchindlerPeter Vettiger
    • H04B3/03H04B1/58H04M19/00
    • H04M19/005H04B1/587
    • This invention comprises a telephone hybrid circuit having two opto-coupler arrangements for transferring voice signals from the two-wire line to a port of the switching system on one hand and from a port of the switching system to the two-wire line on the other hand. In addition, a pair of feeder circuits in the form of current sources comprising active elements are provided for feeding a constant positive direct current to one wire of the two-wire line and a negative direct current of equal magnitude to the other wire of the two-wire line. Each of the current sources includes control circuitry for maintaining a constant ratio between the current furnished by the current source and a control current common to both current sources. A control current path is connected to the output of one of the opto-coupler arrangements for generating a common control current in response to a dc signal and a superimposed voice signal received from a port of the switching system. The other opto-coupler arrangement couples the signals from the two-wire line to a port of the switching system.
    • 本发明包括具有两个光耦合装置的电话混合电路,用于一方面将语音信号从双线线路传送到交换系统的端口,另一方面从另一方面将交换系统的端口传输到双线线路 手。 另外,提供了包括有源元件的电流源形式的一对馈电电路,用于将恒定的正直流电流馈送到双线线路的一条线路,并且向两条线路的另一条线路提供等量的负直流电流 一线。 每个电流源包括用于维持由电流源提供的电流与两个电流源公共的控制电流之间的恒定比率的控制电路。 控制电流路径连接到光耦合装置之一的输出,以响应于从交换系统的端口接收的直流信号和叠加的语音信号而产生公共控制电流。 另一个光耦合装置将来自双线线路的信号耦合到交换系统的端口。