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1260 条记录 (耗时 0.016 秒)

    Monitoring circuit in data sets,with signal muting
    1.
    发明授权
    Monitoring circuit in data sets,with signal muting 失效
    监控数据集中的电路，带有信号静音

    公开(公告)号：US3665107A

    公开(公告)日：1972-05-23

    申请号：US3665107D

    申请日：1970-11-13

    申请人： AUTOMATIC ELECT LAB

    发明人： KOPEC THOMAS J ,  MORSTADT RICHARD A

    IPC分类号： H04M11/06

    CPC分类号： H04M11/06

    摘要： A circuit for use in a data set that permits the user to monitor acknowledgment tones or voice signals from a distant data receiving station, as well as permitting monitoring of tones representing data transmitted by the user''s own station. Signal muting of both the data set telephone receiver and an extension telephone are provided to limit the tone levels, as well as isolation from the telephone line to reduce impedance mismatching.

    Signal transmission system with a variable level clipping circuit
    2.
    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.