Method of measuring transmission paths

A theoretical explanation and experimental proof are presented of a method for localizing and evaluating the transmission paths of any signal in a “black box” among a set of points previously defined in it. The signal should behave linearly and the system should be able to receive external excitations separately at each of its points. Such excitations need not be the signal under study but they should be linearly related to it. Also presented are the equations that, once the transmission paths have been determined, allow the evaluation of the excitations which act on the system.