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Ambulances in Stockholm are testing a system that interrupts in-car audio systems to warn drivers that they need to get through.
The solution was developed by students at the KTH Royal Institute of Technology in the city. It broadcasts a voice warning, while a text message also appears in the radio display. It uses an FM radio signal to jam drivers' speakers and stop music playing. It will only be able to alert cars that have their radios turned on. It can also interrupt CDs and music connected via Bluetooth.
[...] "Often drivers have only a few seconds to react and give way to emergency vehicles," said Mikael Erneberg, a KTH student who worked on the system. "The optimal warning time is at least 10 to 15 seconds."
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Ambulances to Jam Car Radios in Sweden
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(Score: 3, Informative) by Whoever on Friday January 20 2017, @03:55PM
This is merely another use of the RDS system, which allows traffic information to override normal radio function. This is not jamming radios.
(Score: 1) by jrial on Friday January 20 2017, @04:20PM
Install windows on my workstation? You crazy? Got any idea how much I paid for the damn thing?
(Score: 3, Touché) by yarp on Friday January 20 2017, @05:22PM
With the article's mention of RDS, I initially thought it might be making use of EON (Enhanced Other Networks) in collaboration with local radio neworks, but that would be too broad in scope and end up notifying drivers who are miles away from the ambulance.
Seems the ambulance is making a low power FM simulcast on some common frequencies, effectively jamming the stations for people in its vicinity.
This probably varies the power of the transmission.
I like this quote on their website (http://evamsystem.com/ [evamsystem.com]):
No receiver needed? Do they expect people to pick up FM stations with their fillings or something?
(Score: 2) by krishnoid on Friday January 20 2017, @10:44PM
Do they expect people to pick up FM stations with their fillings or something?
Maybe in Norway [thelocal.no], anyway.
(Score: 1) by nitehawk214 on Friday January 20 2017, @08:25PM
In fact, when this was posted to Slashdot a few days ago the title was less clickbaity.
"Don't you ever miss the days when you used to be nostalgic?" -Loiosh
(Score: 2) by captain normal on Friday January 20 2017, @05:07PM
Seems like it is a bit more than sending a RDS alert. This device also blocks signals to speaker systems and from Bluetooth devices.
When life isn't going right, go left.
(Score: 3, Insightful) by yarp on Friday January 20 2017, @05:25PM
I think they do this with the Traffic Announcement feature of RDS. As long as the radio is tuned to a station it will interrupt other sources when a TA message is received.