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Philips Semiconductors
User Manual of High-End RDS/EON
Car Radio System CCR612 (V0.3)
Application Note
96029
Key Description
STEREO This key is only active in FM. It is used to force mono reception if stereo
reception has too much noise. The mono/stereo state is reset to stereo by all
user tuning operations or preset selections.
After pressing the key, the current state is displayed in the LCD text window by
means of the text "STEREO" or "MONO" for 4 seconds. If - within that period -
the key is pressed again, the state is toggled (only possible when a stereo
transmitter is received), and the new state is displayed - again for 4 seconds.
The stereo icon on the display shows the state of the stereo decoder. The icon
is on in case of stereo reception. The icon is off in case of mono reception or in
case forced mono is selected.
LOCAL/DX This key can be used to control an attenuator in the FM antenna circuit during
search. Attenuation may be inserted to reduce intermodulation caused by
strong adjacent stations.
By pressing the LOCAL/DX key, the current Local / Dx status is toggled. This
status is displayed via an icon.
For FM, the Local / Dx switch is incorporated in the TEA6811. Putting the radio
in Local mode results in an attenuation of the aerial signal with 15 dB. For AM,
the signal levels read back from the TEA6822 are used to create the Local /Dx
functionality. In AM mode, the search stop level for Local is set 22 dB higher
than when the radio is in Dx-mode.
MODE This key is used to overrule the default selection of the audio source: radio,
CD-changer, cassette or external.
Each time the key is pressed, the next input source is selected in the order:
radio -> CD-changer -> cassette -> external
with the restrictions:
- CD-changer is selected only if the CD-changer was connected during
power-on.
- Cassette is selected only if a tape is present in the cassette deck.
- External is selected only if a connector is inserted in the external input
jack.
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