Unattended noise monitors are a common tool used to manage the noise generated by large distributed sources such as airports and military installations. In most instances, the desire is to measure just the noise from the source under study or to separate out the noise from the source under study from other noises. In practice, this can be a difficult task. In the case of blast noise from military weapons (e.g., artillery, tanks, bombs), it is necessary to separate this particular noise from other low-frequency, short-duration sounds which can be generated by helicopters, quarries, and road construction, etc., or from wind-induced pseudonoise. The use of FUZZY logic to perform this separation and to designate those measured noise events that come from weapons fire at the military installation is described.