To Create a Quieter City, They're Recording the Sounds of New York


On Thursday, microphones mounted outside two buildings in Manhattan went live. 

Bright yellow signs that say "Recording Underway" announced their arrival. 

But these devices are not eavesdropping on your conversations

A group of researchers from New York University and Ohio State University are training the microphones to recognize jackhammers, idling engines and street music, using technology originally developed to identify the flight calls of migrating birds. Think of it as the Shazam, the smartphone app that can identify songs, of urban sounds.

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