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INTERFERENCE SIGNAL RECORDING DEVICE, AND SYSTEM AND METHOD FOR LOCATING FAULT POINT OF CABLE TELEVISION NETWORK
INTERFERENCE SIGNAL RECORDING DEVICE, AND SYSTEM AND METHOD FOR LOCATING FAULT POINT OF CABLE TELEVISION NETWORK
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机译:干扰信号记录装置以及用于定位有线电视网络故障点的系统和方法
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摘要
The invention provides an interference signal recording device, a system and method for locating impairment sources in a cable network by means of the interference signal recording device: one interference signal recording device is installed on the headend of the cable network, another signal recording device is installed in a cable branch of the cable network via a signal coupler; both interference signal recording devices comprise samplers; each of the interference signal recording device starts to sample the interference signal at the moment when receiving a predetermined sampling timing signal from downstream signals; a computer is used for obtaining digital sample sequences of the interference signals obtained by sampling of the two interference signal recording devices via the Internet and for calculating a cross-correlation function of the two digital sample sequences; it can be determined whether an impairment source exists in a signal delivering path passing through the location of signal coupler in the downstream, in accordance with presence or absence of a cross-correlation peak caused by the impairment source in the cross-correlation function graph as a calculation result.
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