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    D.c. to d.c. converter for connection across telephone lines
    1.
    发明授权
    D.c. to d.c. converter for connection across telephone lines 失效
    用于通过电话线连接的直流转换器

    公开(公告)号：US3708741A

    公开(公告)日：1973-01-02

    申请号：US3708741D

    申请日：1971-06-21

    申请人： HEKIMIAN LABORATORIES INC

    发明人： HEKIMIAN N

    IPC分类号： H02M3/338 ,  H04M1/00 ,  H03D1/16

    CPC分类号： H02M3/3381

    摘要： D.C. supervisory signals control tones and audio signals appearing across a pair of balanced floating telephone lines are converted to permit processing by a single-ended grounded system. The converter circuit includes a high-impedance diode bridge full wave rectifier connected across the floating telephone lines and feeding a self-excited oscillator with an output signal amplitude substantially proportional to the D.C. voltage across the floating lines. The output signals from the rectifier and oscillator are passed through an isolation transformer to a single-ended detector which restores the supervisory signal D.C. level. The relatively high D.C. level of the supervisory signal acts to forward bias the rectifier and detector to pass the relatively low level audio signal and touch tones without distortion.

    摘要翻译： 通过一对平衡的浮动电话线路出现的D.C.监控信号控制音调和音频信号被转换为允许通过单端接地系统进行处理。 转换器电路包括跨越浮动电话线连接的高阻抗二极管桥式全波整流器，并馈送自激振荡器，其输出信号幅度基本上与浮动线路上的直流电压成比例。 来自整流器和振荡器的输出信号通过隔离变压器传送到恢复监控信号直流电平的单端检测器。 监控信号的相对较高的直流电位用于使整流器和检测器正向偏置以通过相对低电平的音频信号和触摸音而不失真。