Philips Semiconductors
User Manual of High-End RDS/EON
Car Radio System CCR612 (V0.3) Application Note
96029
AF follow mode
WhenAF follow mode is on, the set will regularly measure the signal strength of alternative frequencies
and compare it with the current station. If an alternative frequency offers betterquality, the radio will
switch over and update the alternative frequency list. The measuring scheme is designed to cause
minimumnoticeable disturbance for the listener. The interval time between two measurements depends
on the signal quality.
Intelligent preset programme recall
Ifan FM programme preset with a known PI code is recalled, the primary frequency and all alternative
frequenciesstored in the programme preset memory are examined. The frequency with the best signal
qualitybroadcasting the correct PI code will be selected. Only when the programme is not found on one
of the AFs, after 6 seconds a search is started for a station with a proper PI code.
TA mode
In TA mode the radio only searches for transmitters that transmit the RDS traffic programme on the
samestation or on EON linked stations. The radio will automatically start a searchwhen switching TA
mode on and the current station is not a traffic station.
PTY scan mode
In PTY scan mode the radio searches for transmitters that transmit the user-selected PTY code.
Dependenton the factory option USA/Europe the RBDS PTY-table or the RDS PTY-table is used. Only
English PTY messages are available.
Laststatus memory: band, frequency, PI code, AF follow mode on/off status and TA mode on/off status
are stored in memory. This status is recalled during switch on.
RDS
Bit, block and group synchronisation. (inclusive RBDS E-block detection).
Data collection and decoding of:
-PI, Programme Identification code
-AF, Alternative Frequencies
-TP, Traffic Programme
-TA, Traffic Announcement
-PS, ProgrammeService name
-PTY, Programme TYpe
-EON, EnhancedOther Network
AF follow mode using PI and AF (see also Tuning).
Display of the programme service name in 8 alpha-numeric characters (PS name).
Display of AF, TP, TA, PTY, EON and Regional mode status via icons.
Regional mode on/off switching. When Regional mode ison, the radio will, during AF switching, only
switch over to stations with exactly the samePI-code. When Regional mode is off, the radio will also
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