Android smartphone app triangulates gunfire

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We recently wrote about Vaporsens, the handheld electronic dog's nose that can help police forces accurately determine the presence of illegal substances. Now, researchers at the Vanderbilt University in Nashville have developed a smartphone app that can detect the origin of gunfire. Gunshots have a unique sound that can be separated out from ambient noise due to the fact that the majority produce a "muzzle blast – an expanding balloon of sound that spreads out from the muzzle each time the rifle is fired", followed by the "distinctive shockwaves" created by traveling bullets, the team explain. The app is combined…

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