The podcast and associated blog, 99 Percent Invisible, recently reported on a new technology that is used to reduce unwanted urban noise pollution. Sono is a concept conceived of by Rudolf Stefanich that can be used similarly to noise-canceling headphones. The Sono would be able to filter out sounds in order to hear others more clearly, like birds chirping in nearby trees or to eliminate ambient noise to better listen in a quiet conversation.
Another prototype being developed by another company is called Muzo–which its creators claim–can cancel noise and create mobile bubbles of privacy. The device was crowdfunded through a Kickstarter campaign but its efficacy is still unknown.
For more information about both prototypes and similar wearables, click here.