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    Method of and system for measuring the transmission characteristics of four-terminal networks
    92.
    发明授权
    Method of and system for measuring the transmission characteristics of four-terminal networks 失效
    测量四终端网络传输特性的方法和系统

    公开(公告)号：US4275348A

    公开(公告)日：1981-06-23

    申请号：US6759

    申请日：1979-01-26

    申请人： Herbert Bayer ,  Gunther Hoffmann ,  Eberhard Schuon

    发明人： Herbert Bayer ,  Gunther Hoffmann ,  Eberhard Schuon

    IPC分类号： G01R27/28 ,  G01R27/00

    CPC分类号： G01R27/28

    摘要： To measure the transmission characteristics of a signal line or other four-terminal network, a multifrequency test signal is fed through that network via a first channel to one input of a differential amplifier whose other input receives via a second channel a substantially identical comparison signal. A difference signal in the output of the differential amplifier, after rectification and possible filtering, is used for manual or automatic adjustment of an amplifier (or attenuator) and a delay unit in either or both channels until the magnitude of that difference signal is a minimum, its residual value indicating frequency-dependent distortions such as background noise or phase jitter not removable by broad-band adjustment of signal level and phase delay. The test signal, advantageously provided by a generator of the pseudorandom type, may be delivered to the second channel by that generator ahead of the four-terminal network to serve as the comparison signal; alternatively, the latter signal may be produced on the output side of the tested network by an identical generator under the control of synchronizing pulses extracted from the measuring signal traversing that network.

    摘要翻译： 为了测量信号线或其他四端网络的传输特性，多频测试信号通过第一通道通过该网络馈送到差分放大器的一个输入，其另一输入经由第二通道接收基本上相同的比较信号。 在整流和可能的滤波之后，差分放大器的输出中的差分信号用于在任一个或两个通道中的放大器（或衰减器）和延迟单元的手动或自动调节，直到差分信号的幅度最小 ，其残留值指示频率相关失真，例如背景噪声或相位抖动，不能通过信号电平和相位延迟的宽带调整来移除。 由伪随机类型的发生器有利地提供的测试信号可以由四终端网络之前的发生器传送到第二信道，以用作比较信号; 或者，后一信号可以在同步发生器的输出端上产生，该同步发生器在从穿过该网络的测量信号提取的同步脉冲的控制下产生。