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

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  1. Dec 23, 2016 #1
    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.
     
  2. jcsd
  3. Dec 23, 2016 #2

    berkeman

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    Staff: Mentor

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

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

    :smile:
     
  4. Dec 23, 2016 #3

    anorlunda

    Staff: Mentor

    The same way you tell the difference between people's voices, or the difference between a motorcycle a car and a truck's sound.
     
  5. Dec 23, 2016 #4
    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 ?
     
  6. Dec 23, 2016 #5

    berkeman

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    Did you look around the ShotSpotter website that I linked to?
     
  7. Dec 23, 2016 #6
    Yeah !! How do in code that ? What algorithms are they using ?
     
  8. Dec 23, 2016 #7

    berkeman

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    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.
     
  9. Dec 23, 2016 #8
    wow how do they know where the gun fire is coming from ? This is what I wanted to code...
     
  10. Dec 23, 2016 #9

    berkeman

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    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.
     
  11. Dec 23, 2016 #10

    berkeman

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    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
     
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