If you’ve ever been startled by the sudden appearance of an ambulance while blasting music in your car, then you appreciate the value of a loud siren. Fortunately, your car is probably equipped already to receive warning signals on its audio system, thanks to a new solution developed by students in Sweden.
from Engineering and Construction News – ScienceDaily https://www.sciencedaily.com/releases/2017/01/170116121914.htm
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