6. The method of claim 5 wherein the plurality of sensors includes N sensors, and wherein each window class in the library of window classes exclusively characterizes a respective region in an N-dimensional hyperspace and each dimension of the N-dimensional hyperspace represents a property of the signal from a respective one of the N sensors.
6. The method of claim 5 wherein the plurality of sensors includes N sensors, and wherein each window class in the library of window classes exclusively characterizes a respective region in an N-dimensional hyperspace and each dimension of the N-dimensional hyperspace represents a property of the signal from a respective one of the N sensors. 8. The method of claim 6 wherein, for each window class in the library of window classes, the corresponding region in the N-dimensional hyperspace is exclusively characterized by at least one respective angle formed in the N-dimensional hyperspace.