Facility managers and safety professionals need immediate recognition and notification of a gunshot.
Relying on victims or bystanders to notify authorities can take too much precious time. Reliability and volume of information about the event location can change rapidly from initial incoming 911 calls to when law enforcement arrives on scene.
Dr. Bob Banerjee, of Nice Systems. posed the idea of using an IP camera enabled with audio detection capability and a powered microphone to detect a gunshot. click here for Dr. Bob's video
We hit the road to prove the concept at a shooting range in Virginia.
Objectives
Test equipment
Setup
Microphones of different types by Crown, Louroe, and other manufacturers were connected to amplifiers which were connected to the Bosch cameras’ line level audio inputs. The microphones were spread around the range which was approximately 25 meters x 25 meters in size.
Most models of Bosch Security Systems IP cameras have the ability to evaluate an incoming line level audio signal based on volume and frequency. This is not an add-on and does not cost anything additional to the base price of the camera.
For this test, we captured the audio alarm differences between same-room gunshots and distant-room gun shots.
The diagram below shows the test screens of the four cameras and microphones. There were four cameras, each with one microphone. The top of the image shows the specific test being conducted.
The image below depicts the frequencies that are monitored by the Bosch cameras:
Below is a screenshot of a 9mm handgun audio detection alarm using four Bosch IP cameras each equipped with powered microphone:
Below is the video of the data collected while testing of a variety of weapon types:
Technology application
The ability to detect a specific frequency at a specific volume is only half of the process. Once the “alarm state” is recognized by the camera, the next steps need to take place. The camera must be connected to another system to cause a notification to occur:
Download this report in PDF format here
Watch Nice Systems’ testing of Bosch audio alarms here:
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