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Philips Semiconductors
User Manual of High-End RDS/EON
Car Radio System CCR612 (V0.3)
Application Note
96029
6.4.1 The SELECT key
By default, the VOL-UP and VOL-DOWN keys control the volume. To select other functions, press the
select key short until the desired function is shown on the display. Figure 15 shows how control functions
are selected using the select key. If the 2-speaker option is selected in the user programmable options,
the fader function is not available and the fader setting is always mid-range. This function is disabled if no
digital sound control chip is installed.
SELECT
BASS
SELECT
TREBLE
SELECT
BALANCE
SELECT
FADER
SELECT
6 sec
timeout
6 sec
timeout
6 sec
timeout
6 sec
timeout
VOLUME
Figure 15 Selection of sound control functions
6.4.2 Changing a setting
To change a setting, press the VOL-UP or VOL-DOWN key until the desired level is reached. As long as
a key is pressed, the bass and treble function changes with 4 steps per second and the volume, balance
and fader function will change with 8 steps per second. The table below shows the control range and step
size for the audio control functions.
Function Step size
TEA6320,6322/
TEA6321,6323
Range
Volume variable mute, -61 dB, -53 dB, -47 dB, -43 dB, -39 dB, -37 dB
-35 dB, -33 dB, -31 dB, -30 dB, -29 dB, .. +19dB, +20 dB
Bass 1.5 dB/
1.8 dB
-15 dB to +15 dB /
-18 dB to +18 dB
Treble 1.5 dB -12 dB to +12 dB
Balance variable rigth: mute, -30 dB, -22, -16, -12, -8, -6, -4, -2, 0 dB
left: 0 dB, -2, -4, -6, -8, -12, -16, -22, -30 dB, mute
Fader variable front: mute, -30 dB, -22, -16, -12, -8, -6, -4, -2, 0 dB
rear: 0 dB, -2, -4, -6, -8, -12, -16, -20, -30 dB, mute
The volume setting is not shown on the display. Other functions are shown on the display(e.g. BASS +6).
6.4.3 The LOUD key / RESET function
Loudness is switched on/off by pressing the LOUD key short. When loudness is on, bass and treble are
added to the audio signal, depending on the volume level. The loudness function is carried out by the
TEA632x. If no TEA632x is installed the loudness function is carried out by external loudness circuitry
controlled by the LOUDN pin. The loudness on off status is displayed via an icon. When the loudness key
is pressed for 4 seconds (until the radio bleeps), the reset function is executed. This function sets bass,
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