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Philips Semiconductors
User Manual of High-End RDS/EON
Car Radio System CCR612 (V0.3)
Application Note
96029
7.4 Traffic Announcements
RDS data contains two bits called TP (Traffic Programme) and TA (Traffic Announcement), see the table
below for the meaning of these bits.
TP TA Meaning
0 0 No announcements, no traffic station
0 1 Traffic announcements indirect via at least one EON
referenced station, (traffic station)
1 0 Traffic announcements on this station, (traffic
station)
1 1 Traffic announcement on this station now
The radio will start a search for a traffic station when the TA mode is switched on when the current station
is not a traffic station.
If TA mode is on, and the current station is not a traffic station, the TP icon will blink, and a warning bleep
is generated every 30 seconds.
If a traffic announcement is received while TA mode is on, and the radio is in CD-changer, cassette mode,
external mode or muted, this mode is temporarily overruled and the traffic announcement is passed on.
If the volume setting was very low, it is temporarily raised to get the user’s attention.
If a traffic announcement is received via EON (RDS group 14B is received indicating the PI code of the
other station transmitting the traffic announcement), the radio will check its internal pool store and will try
to switch over to the other station transmitting the traffic announcement. The radio will stay on this other
station for at least 4 seconds to give the broadcaster time to synchronise the RDS TP and TA data over
its network.
By pressing the TA key the current traffic announcement will be cancelled but the radio remains in TA
mode.
If during a traffic announcement the signal quality becomes too weak resulting in the fact that RDS
reception is lost, CCR612 will cancel the traffic announcement after a timeout of 2 minutes.
7.5 Alternative Frequency following
The radio will always assemble a list of alternative frequencies from the received RDS data, even when
AF follow mode is off. When the current frequency is left (by tuning, band switching or by turning the radio
off), the alternative frequency list is stored in NVM if it is different from the previous stored list.
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