BRIEF DESCRIPTION OF THE DRAWINGS [0016]FIG. 1 is a block diagram showing a general environment for a signal classification system and method. [0017]FIGS. 2 and 3 illustrate examples of the types of signals that may be simultaneously present in two exemplary radio frequency bands. [0018]FIG. 4 is a block diagram of an exemplary spectrum analysis device that generates data useful as input to a sign