How can you identify the type of gun by the sound it makes?

[btb4198]

how can you identify the type of gun by the sound it makes ? Like if you had a recording of a gun shot but you Can't see the gun and you can find the bullet.

 

[berkeman]

how can you identify the type of gun by the sound it makes ? Like if you had a recording of a gun shot but you Can't see the gun and you can find the bullet.

You can or can't find the bullet? Big difference...

Have you looked into this: http://www.shotspotter.com/

 

[anorlunda]

The same way you tell the difference between people's voices, or the difference between a motorcycle a car and a truck's sound.

 

[btb4198]

The same way you tell the difference between people's voices, or the difference between a motorcycle a car and a truck's sound.

Sorry I meant in code. So like I want to write a program than an tell the different. Also you can tell the difference between people's voice by find the fundamental frequency right ?

 

[berkeman]

Sorry I meant in code. So like I want to write a program than an tell the different.

Did you look around the ShotSpotter website that I linked to?

 

[btb4198]

Did you look around the ShotSpotter website that I linked to?

Yeah ! How do in code that ? What algorithms are they using ?

 

[berkeman]

Yeah ! How do in code that ? What algorithms are they using ?

I"m sure their code is proprietary, especially the physical location determination part. Did you see if they claim that they can also distinguish rifle/pistol and maybe the approximate caliber?

Have you studied voice recognition software yet? That's a good place to start to learn how to write code to distinguish different sounds.

 

[btb4198]

wow how do they know where the gun fire is coming from ? This is what I wanted to code...

 

[berkeman]

wow how do they know where the gun fire is coming from ? This is what I wanted to code...

They primarily use time-of-flight to multiple sound detectors, but they also have to do initial testing and calibration of an installation to learn about the echo characteristics and multi-path characteristics. Most of the ShotSpotter installation are in towns and city environments, where there are multiple bounces for most of the acoustic paths.

 

[berkeman]

Also, keep in mind that most high-power rifle bullets are supersonic, so they generate a mini-sonic-boom as they travel near the sensors -- it's not just the initial shot sound that goes into figuring out what type of round it is:

http://www.shotspotter.com/technology

Unlike counter-sniper sensors which can only measure a limited range of sounds—the supersonic signature of a sniper’s round with a known ballistic coefficient—SST’s wide area protection system measures the full range of impulsive sounds (sounds which are explosive in nature) found in urban weaponry, from sub and supersonic impulses to explosions.