A Noise-Cancelling Headphone that Turns Off when it Hears a Train Horn

[Mark W]

The article focuses on inner-city emergency/traffic sound waves, but almost guaranteed to include a train horn library too.

http://www.cnet.com/news/amazons-next-noise-canceling-headphones-could-turn-off-when-someone-yells-your-name/

Pretty simple idea, can't believe its just now getting a patent!  Perhaps this will reduce a few fatalities on the ROW. 

[learmoia]

The article focuses on inner-city emergency/traffic sound waves, but almost guaranteed to include a train horn library too.

http://www.cnet.com/news/amazons-next-noise-canceling-headphones-could-turn-off-when-someone-yells-your-name/

Pretty simple idea, can't believe its just now getting a patent!  Perhaps this will reduce a few fatalities on the ROW.

The opposite idea has been around for gun world for a while.   You hear ambient voices until it picks up sharp loud noises and cuts out for the shot then comes back.