Philips CEM2000/00, Service Manual

Page: 32 / 72

PT7313E
V1.0 8 February 2010
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 LSB Function
0 0 B2 B1 B0 A2 A1 A0 1.25dB/step
0 0 0 0
0 0 1 -1.25
0 1 0 -2.5
0 1 1 -3.75
1 0 0 -5
1 0 1 -6.25
1 1 0 -7.5
1 1 1 -8.75
0 0 B2 B1 B0 A2 A1 A0 10dB/step
0 0 0 0
0 0 1 -10
0 1 0 -20
0 1 1 -30
1 0 0 -40
1 0 1 -50
1 1 0 -60
1 1 1 -70
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 LSB Function
1 0 0 B1 B0 A2 A1 A0 Speaker LF
1 0 1 B1 B0 A2 A1 A0 Speaker RF
1 1 0 B1 B0 A2 A1 A0 Speaker LR
1 1 1 B1 B0 A2 A1 A0 Speaker RR
0 0 0 0
0 0 1 -1.25
0 1 0 -2.5
0 1 1 -3.75
1 0 0 -5
1 0 1 -6.25
1 1 0 -7.5
1 1 1 -8.75
0 0 0
0 1 -10
1 0 -20
1 1 -30
1 1 1 1 1 Mute
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