Loop fault locater专利检索-功率谱信号处理专利检索查询-专利查询网

Loop fault locater

阅读：459发布：2023-10-01

专利汇可以提供Loop fault locater专利检索，专利查询，专利分析的服务。并且Faults on a telephone cable pair are located by a frequencydomain detection system. The derivative, with respect to frequency, of the phase angle of the complex input impedance of the pair is measured periodically across a predetermined frequency band to produce a periodic time function. The power spectrum of this function is determined and the frequencies of the spectrum maxima are used to estimate the distances to all of the faults from the measurement point.，下面是Loop fault locater专利的具体信息内容。

权利要求

1. A transmission line fault location system comprising: means for generating a swept-frequency periodic signal proportional to the derivative of the phase of the input impedance of said line with respect to frequency, and means for measuring the frequencies of the maxima of the power spectrum of said signal.

2. Apparatus for locating telephone cable faults detectable as one or more impedance irregularities at the input terminals of a cable pair comprising: means for generating a steady-state cosine wave and for applying said wave to said input terminals of the cable pair, means for periodically swept-frequency modulating said steady-state wave over a predetermined frequency range thereby generating periodic time functions, means for generating a signal proportional to the derivative with respect to frequency of the phase of the input impedance of said cable pair, means for determining the power spectra of said periodic functions, and means for identifying the frequencies of the maxima of said power spectra, said identified frequencies being proportional to distances to faults from said input terminals.

3. Apparatus for developing indicia of the distance of a telephone cable pair fault from a central location comprising: means for applying a sinusoidal voltage signal to said faulted cable, means for repeatedly and substantially linearly varying the frequency of said test signal within a predetermined frequency range, means for measuring the current which flows in the faulted cable in response to the input voltage, means for squaring and bandpass filtering signals proportional to said input voltage and said current, means for comparing the phase angle of said squared and bandpass filtered current and voltage signals to produce a signal proportional to the derivative with respect to frequency of the phase angle between said current and voltage, and means for generating a spectral analysis of said phase derivative.

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Loop fault locater

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