[moreati]

I wonder if false positives will take off e.g. personal attack alarms that make a sound like gun fire

[Dove]

My dad was using a powder-actuated concrete nail gun for some remodeling not long ago. It used .22 loads to drive nails. The sound it made was eerily identical to the real thing.

[kijin]

The system will have to distinguish real firearms from other powder-actuated hardware. Otherwise it's going to become useless anywhere near a construction site.

But what if you shoot a person with a nail gun?

[ComputerGuru]

> But what if you shoot a person with a nail gun?

What if you stab a person with a knife?

It's off-topic. It was designed and built to detect gunshots from real guns.

[Dove]

I think the best way to distinguish between firearms and nail guns would be with a man in the loop listening to the sounds (which they appear to have). Construction doesn't sound like a firefight.

[Jabbles]

Wouldn't it make more sense to make the alarm send out a standardised frequency a la DTMF tones?