Abstract: A method of detecting glass breakage utilizing the sound produced by an event comprising the steps of sensing the sound and producing an electrical signal characteristic of the sound, producing a plurality of frequency band-limited signals from the sound signal, determining when a normalized rate-of-rise of a plurality of the band limited signals is above a given value specified for the particular band-limited signal and analyzing the sound signal further only if a plurality of the band-limited signals have a normalized rate-of-rise greater than their respective given value during a specified time period.