PROBLEM TO BE SOLVED: To provide a new method and apparatus to detect damage of signals.;SOLUTION: This apparatus detects the damage of an event signal due to artifact under the surroundings where an event signal 100 possible to be damaged coexists with two or three and more non-event signals 102 possible to be related with artifact. In this case, a sensor which supplies input signals including an event signal coexisting with two or three and more non-event signals, ameasurement system 106 which receives input signals from the sensor and separates the received signals into their components and which comprises a receiver to receive input signals, a detector to detect event signals from the received input signals and a detector to detect non-event signals from the received input signals, correlating devices 122, 124, 126 which create individual correlation signals by comparing the detected event signals with individual detected non-event signals and inference processors 108, 116, 118, 120 which analyze the correlation signals and create directions of signal damage are provided.;COPYRIGHT: (C)2000,JPO
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