Group-delay distortion-measuring equipment
Group-delay distortion-measuring equipment
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DOI：
10.1049/pi-3a.1952.0051
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发表时间：
1952
期刊：
影响因子：
--
通讯作者：
G. J. Hunt;L. Kemp
中科院分区：
文献类型：
--
作者：
G. J. Hunt;L. Kemp
本文描述了用于测量传输系统在200 kc/s至5 Mc/s频率范围内相位/频率特性斜率变化的设备。该设备同样可以很好地用于确定系统的失真特性，该系统的输入和输出终端在一个地方可用，或者在具有远程发送和接收终端的安装系统中的常见条件下可用。与几乎所有的群延迟测量方案一样，基本原理是由于奈奎斯特。该设备代表了当前技术的进步，用直接阅读的设备代替了费力的操作程序。当发射机测试频率在所需范围内从基准频率变化时，群延迟失真的直接读数由以10毫秒间隔校准的阴极射线管显示器给出。
The paper describes equipment used to measure changes in the slope of the phase/frequency characteristic of a transmission system over a frequency range extending from 200 kc/s to 5 Mc/s. The equipment can be used equally well to determine the distortion characteristic of a system of which the input and output terminals are available in one place or under the conditions common in an installed system with remote transmitting and receiving terminals. In common with nearly all schemes of group-delay measurement, the basic principle is due to Nyquist. The equipment represents an advance in current technique in replacing laborious operating procedure with the facility of direct reading. When the transmitter test frequency is varied from a datum frequency over the range desired, direct readings of group-delay distortion are given by a cathode-ray-tube display calibrated in intervals of 10 millimicrosec.