> sensors are calibrated to ignore all sounds except for those that most closely match the “impulsive” sound of an explosion
> The blast of a gun is different from other explosive sounds
> “It’s a very, very sharp wave,” Beldock said. “No other sound works that way.”
> Other impulsive sounds — including fireworks, backfires and helicopters — can also trigger the remote sensors
They're calibrated just to hear explosions, and in fact _no other explosive sound works that way_, but then they're triggered by...helicopters? Which are not propelled by explosions?
> The blast of a gun is different from other explosive sounds
> “It’s a very, very sharp wave,” Beldock said. “No other sound works that way.”
> Other impulsive sounds — including fireworks, backfires and helicopters — can also trigger the remote sensors
They're calibrated just to hear explosions, and in fact _no other explosive sound works that way_, but then they're triggered by...helicopters? Which are not propelled by explosions?