公开(公告)号：US06864689B2

公开(公告)日：2005-03-08

申请号：US10339156

申请日：2003-01-09

申请人： Alexander Stephen ,  Daya Rasaratnam ,  Colin Johnstone

发明人： Alexander Stephen ,  Daya Rasaratnam ,  Colin Johnstone

IPC分类号： H04B3/48 ,  G01R27/28

CPC分类号： H04B3/48

摘要： Attenuation of a pulsed signal traversing a cable is assessed by identifying a pulse in a signal received after traversing the cable and determining first and second reference signal levels in dependence upon characteristics of the pulse. A measurement is made of the slope of the pulse between the first and second reference signal levels (such as 25% and 75% of the peak pulse magnitude), and this measurement is used to determine an indication of the cable attenuation. The cable attenuation may in turn be used to determine a threshold for indicating loss of signal during a measurement operation.

摘要翻译： 穿过电缆的脉冲信号的衰减通过识别穿过电缆后接收到的信号中的脉冲并根据脉冲特性确定第一和第二参考信号电平来评估。 测量第一和第二参考信号电平之间的脉冲斜率（如峰值脉冲幅度的25％和75％），该测量用于确定电缆衰减的指示。 电缆衰减又可用于确定在测量操作期间指示信号丢失的阈值。