公开(公告)号：US07415367B2

公开(公告)日：2008-08-19

申请号：US10850528

申请日：2004-05-20

申请人： Thomas Holtzman Williams

发明人： Thomas Holtzman Williams

IPC分类号： G01R31/00

CPC分类号： H04N17/00

摘要： A system and method to range a distance to a source of CPD (Common Path Distortion) on a two-way cable system, comprising a local CPD source and a cross-correlator. The local CPD source generates a local distortion signal from a downstream signal, wherein the downstream signal includes multiple carriers of TV channels. The source of CPD in the cable system mixes the carriers of the TV channels to create an upstream actual distortion signal. The cross-correlator performs a cross-correlation between the local distortion signal and the upstream actual distortion signal to create a cross-correlation plot, and the distance to the source of CPD is determined from the round-trip time.

摘要翻译： 包括本地CPD源和互相关器的双向电缆系统的距离到CPD源（公共路径失真）的距离的系统和方法。 本地CPD源从下行信号产生局部失真信号，其中下行信号包括电视频道的多个载波。 电缆系统中的CPD源将电视频道的载波混合，产生上行的实际失真信号。 互相关器在局部失真信号和上行实际失真信号之间进行互相关，以产生互相关图，并且从往返时间确定到CPD源的距离。