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Philips Semiconductors
User Manual of High-End RDS/EON
Car Radio System CCR612 (V0.3)
Application Note
96029
AF follow mode
When AF follow mode is on,the set will regularly measure the signal strength ofalternative frequencies
and compare it with the current station. If an alternative frequency offers better quality, the radio will
switch over and update the alternative frequency list. The measuring scheme is designed to cause
minimum noticeable disturbancefor the listener.The interval time betweentwo measurements depends
on the signal quality.
Intelligent preset programme recall
If an FM programme preset with a known PI code is recalled, the primary frequency and all alternative
frequencies stored in the programme preset memoryare examined. The frequency with the best signal
quality broadcasting the correctPI code will be selected. Onlywhen the programme is notfound 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
same station or on EON linked stations. The radio will automatically start a search when 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.
Dependent on the factoryoption USA/Europe the RBDS PTY-table orthe RDS PTY-table is used. Only
English PTY messages are available.
Last status memory: band, frequency, PI code, AF follow mode on/off status and TA modeon/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, Programme Service name
- PTY, Programme TYpe
- EON, Enhanced Other 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 is on, the radio will, during AF switching, only
switch over to stations with exactly the same PI-code. When Regional mode is off, the radio will also
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