Function Description - Philips CEM2000/00 Service Manual

Princeton Technology Corp

FUNCTION DESCRIPTION

MASTER VOLUME
The table below gives a detailed description of the Master Volume Data Bytes. For example, a volume of -37.5dB is given
by 0 0 0 1 1 1 1 0.
MSB
0
0
SPEAKER ATTENUATORS
The speaker attenuator in most of car audio system is performs balance and fader function, the table below gives a
detailed description of the speaker attenuators data bytes. Total control range of the speaker attenuator is from 0dB to
-37.5dB.
Example 1, an attenuation gain of -6.25dB on the Speaker Right Rear channel is combined 0dB and -6.25dB, therefore
it should be given by: 1 1 1 0 0 1 0 1.
Example 2, an attenuation gain of -32.5dB on the Speaker Left Front channel is combined -30dB and -2.5dB, therefore it
should be given by: 1 0 0 1 1 0 1 0.
MSB
1 0
1 0
1 1
1 1
V1.0
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.
0 B2 B1 B0
0 B2 B1 B0
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
0 B1 B0
1 B1 B0
0 B1 B0
1 B1 B0
0 0
0 1
1 0
1 1
1 1
LSB
A2 A1 A0
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
A2 A1 A0
LSB
A2 A1 A0
A2 A1 A0
A2 A1 A0
A2 A1 A0
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
1 1 1
8
PT7313E
Function
1.25dB/step
0
-1.25
-2.5
-3.75
-5
-6.25
-7.5
-8.75
10dB/step
0
-10
-20
-30
-40
-50
-60
-70
Function
Speaker LF
Speaker RF
Speaker LR
Speaker RR
0
-1.25
-2.5
-3.75
-5
-6.25
-7.5
-8.75
0
-10
-20
-30
Mute
February 2010