7-3
Audio Block Diagram
L4102BLA
MAIN CB
A
A
U
DIO SIGNAL
V
OLUME
T
O
SYSTEM
CONTR
OL
BLOCK
INPUT
-0(INV)
INPUT
-1(INV)
SCL
SD
A
IC871
(INPUT SELECT)
SW CTL
3
11
15
12
4
1
9
10
dBX/MNR
P
AND
A1
FM/AM
PRESCALE
I2C READ
REGISTER
A
U
T
OMA
TIC
SOUND
SELECT
NICAM
PRESCALE
L-CH
R-CH
V
OLUME
AG
C
DEMODULA
T
O
R
A/D
CONVER
TER
I2C
DECORDER
T
O
IF/VIDEO
BLOCK
DIA
GRAM
TUNER
A
UDIO1
A
UDIO2
TUNER
A
UDIO1
A
UDIO2
(L-CH)
(R-CH)
2
12
13
IC831
(SOUND PR
OCESSOR)
A
UDIO1(L)
-IN
JK723
SIF
JK724
A
UDIO1(R)
-IN
14
IC801
(A
UDIO AMP)
7
V
O
LUME
11
AMP
AMP
MUTE
/ST
ANDBY
CONTR
OL
6
1
(R-CH)
(L-CH)
2
5
RF
JK801
HEADPHONE
JA
C
K
CN801
SP-R
1
GND
2
SP802
SPEAKER
L-CH
CN802
SP-L
1
GND
2
T
O
IF/VIDEO
BLOCK
DIA
GRAM
13
2
WF1
CLN802
CLN801
SP801
SPEAKER
R-CH
T
O
SYSTEM
CONTR
OL
BLOCK
DIA
GRAM
NICAM-RESET
43
22
A
UDIO
RESET
6
INH
JK751
1
3
A
UDIO2(L)
-OUT
A
UDIO2(R)
-OUT
6
A
UDIO2(L)
-IN
2
A
UDIO2(R)
-IN
Q732
Q733
Q741
Q742
AL+5V
INSEL-MUTE
S/C-J
A
CK-MUTE
SP-MUTE
DEEMPHASIS
SOUND
SELECT
A/D
CONVER
TER
SCAR
T DSP
INPUT SELECT
SCAR
T
PRESCALE
D/A
CONVER
TER
V
OLUME
SCAR
T1 OUTPUT SELECT
SCAR
T1
CHANNEL MA
TRIX
Q
U
ASI-PEAK
CHANNEL MA
TRIX
I2C READ
REGISTER
30
31
Q
U
ASI-PEAK
DETECT
OR
LOUD SPEAKER
CHANNEL MA
TRIX
AV
C
D/A
CONVER
TER
ST
ANDERD
AND SOUND
DETECTION
