How does the car radio displays the name of the station?

Question:I have seen car radios displaying the radio name that´s tuned and the song they´re playing, like a winamp reading the id tag, but how does the radio sends that info, and how does the car radio reads it? And why my mp3 player with fm tuner doesn´t displays it?Powered by Yahoo! Answers A not so ...
Clarion VRX785BT 7-Inch Single DIN Multimedia Station with Fully Motorized Touch Panel Control with USB Terminal iPod and HDD Navigation Ready

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Boss 865DBI Double DIN MP3/CD Receiver with Internal iPod Docking Station

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Clarion VZ709 7-Inch Single-DIN Multimedia Station with Touch-Panel Control and USB Port

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Clarion VZ309 3.5-Inch Single-DIN Multimedia Station with USB Port

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Clarion MAX385VD 6.5-Inch 2-DIN Multimedia Station with Touch Panel Control iPod Ready

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Clarion VZ309 3.5-Inch Single DIN Multimedia Station and USB Port

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Clarion VX709 7-Inch 2-DIN Mulitmedia Station with Touch Panel Control and USB Port

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Boss 750DI Solid State MP3 Receiver with Built-In iPod Docking Station

Features: Solid State AM/FM/MP3 Receiver w/Full Detachable Front PanelInternal iPod Docking Station compatible with most iPod modelsUSB; SD Card Slot & Front Aux-In portsPower 80 Watts X 4 ChannelsProduct DescriptionSolid State MP3 Receiver w/ iPod Docking Station, USB/SD Card Slot, Front Aux-In AM/FM, 80W X 4Average rating: 5.0Price: $88.11Order now! Boss 750DI Solid State MP3 Receiver with ...
