The technology is called Digital Audio Broadcasting (DAB) and in effect 
the digital data is encoded on the same frequency as the audio you're 
receiving, it is pitched outside the range that speakers will reproduce it.

Quite interesting technology.  One site about it is http://www.usadr.com.

Hatton

Raymond Camden wrote:

> So, I did end up buying the Town and Country (and I _love_ it), but I
> noticed something odd. In new cars, the radio sometimes picks up the
> name of the radio station. So instead of seeing 97.3, or whatever, I'll
> see THECOAST. What technology does this? I assume it's extra data being
> sent along with the radio signal. I don't remember reading about this -
> and normally changes like this are kind of a big deal. Anyone have any
> information on this format?
> 
> -Ray
> 
> 
> 
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