Patent ID: 6888455

Claim:
A method of detecting a firearm shot, comprising: providing a firearm shot detection system to sonically detect a firearm shot, the firearm shot detection system including one or more sonic sensors to sonically sense frequencies representative of the firearm shot and transmit signals in response to the firearm shot; electronics to process the signals; providing the firearm shot detection system in a location where firearm shots are prone to occur; first sonically sensing with said one or more sensors a characteristic frequency or frequencies representative of a bang of a gunpowder explosion from the firearm shot and transmitting a signal or signals in response to the firearm shot to the electronics; second sonically sensing with said one or more sensors a characteristic frequency or frequencies representative of a crack of a bullet breaking the sound barrier from the firearm shot and transmitting a signal or signals in response to the firearm shot to the electronics; processing the signals in response to the bang of a gunpowder explosion and the crack of a bullet breaking the sound barrier with the electronics and determining that the firearm shot occurred if the signals represent the bang of a gunpowder explosion and the crack of a bullet breaking the sound barrier; initiating an alarm if the signals represent the bang of a gunpowder explosion and the crack of a bullet breaking the sound barrier.