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    Signal transmission system with a variable level clipping circuit
    1.
    发明授权
    Signal transmission system with a variable level clipping circuit 失效
    具有可变电平剪辑电路的信号传输系统

    公开(公告)号：US3562745A

    公开(公告)日：1971-02-09

    申请号：US3562745D

    申请日：1968-01-29

    申请人： AUTOMATIC ELECT LAB

    发明人： VLAEMINCK NOEL

    IPC分类号： H04L27/30 ,  H04Q3/00 ,  G08B1/00

    CPC分类号： H04L27/30 ,  H04Q3/00

    摘要： A MULTIFREQUENCY SIGNALING SYSTEM TRANSMITTER HAVING A CIRCUIT TO CLIP THE MULTIFREQUENCY PULSE DATA SIGNALS AT A VARIABLE LEVEL TO MINIMIZE TRANSIENTS GENERATED UPON SWITCHING SIGNAL SOURCES ON AND OFF THE TRANSMISSION LINE. THE CLIPPING LEVEL IS DETERMINED BY THE VOLTAGE APPLIED ACROSS A PAIR OF DIODES BY AN EXPONENTIALLY VARYING VOLTAGE OF CHARGING OR DISCHARGING CAPACITORS, VARYING FROM A COMPLETELY SHORT-CIRCUITED STATE WHEN THE DIODES ARE CONDUCTING IN SERIES, TO THE MAXIMUM VALUE OF THE SIGNAL WHEN THE DIODES ARE NON-CONDUCTIVE. THE CHARGING OR DISCHARGING OF THESE CAPACITORS IS CONTROLLED BY A PAIR OF TRANSISTORS THAT ARE SWITCHED BY AN EXTERNAL CIRCUIT APPLYING THE SIGNAL TO THE LINE.