| 摘要 |
In order to locate a faulty pulse regenerator in a transmission system, random streams of test pulses having predetermined statistical variations are transmitted along the transmission system. By slowly varying the mean of a noise signal applied to a decision circuit which generates a first test pulse level when the noise voltage is above threshold and a second test pulse level when the noise voltage is below the threshold, a predetermined amplitude characteristic at the frequency at which the mean of the noise is varied can be imposed upon the distribution of test pulse levels generated by the decision circuit. A regenerator can be determined to be operative or faulty by comparing, at the frequency of the variation of the mean of the noise, the time-varying average signal derived from the regenerated test pulse stream with an anticipated signal. |
