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– 24 –
2-8.
Clock Generator Block
The IC209 CXD8696PLL IC generates 27 MHz, and using this as the master clock, generates
the system clock for audio decoding.
System Clock
384fs
768fs
CD/VCD
16.9344 MHz
33.8688 MHz
DVD
18.4320 MHz
36.8640 MHz
X210
27MHz
4
6
8
9
12
11
20
21
2
•
5
•
9
•
12
3
•
5
•
8
•
11
3
•
6
2
•
5
IC209
PLL
CXD8696
IC206 SN74ABT12608
BUFF
BUFF
IC205 SN74ABT12608
27.0000MHz
768fs
384fs
33.8688MHz
Figure 2-12. Clock generator
– 25 –
2-9.
AC-3 Decoder Block
11-13 • 15-19
1-10 • 21 • 23-26
82 • 85 – 89
91 • 92
50 – 52 • 55 – 64
66 • 67
21
|
23
58
|
60
6
•
7
25
|
28
39
|
41
41
|
43
•
45
20
|
22
23
•
24
36
•
37
25
|
27
33
|
35
21
|
23
19
•
20
4
•
5
256K SRAM
(IC105)
N341256
15
AC-3
DECODER
(IC104)
MB86342
M G/A (IC101)
CXD 8746Q
AC3_BCK
AC3_LRCK
DRC LRCK
DRC BCK
DRC DATA
BSTC
SOG2C
ACSC
SCKG2C
DR BCK
DR LRCK
DR DATA
DR DATA
SCKG2
SOG2
ACS
BST
BST
From S/H (IC805)
From L G/A (IC804)
DIR
(IC102)
IC89051V
SPDIF_AC3
From
IC203
AV Decoder
DD_BCK
DD_LRCK
DD_DATA C
DD_DATA R
DD_DATA F
DD_DATA R
DD_DATA F
To DF DAC
(IC203/204/205)
AU-197 board
2
3
3
3
AC3_DATA F
AC3_DATA R
AC3_DATA C
AC3_DATA R
AC3_DATA C
8
1
Figure 2-13. AC-3 Decoder
The SPDIF_AC3 (Dolby Digital Bit-Stream) audio data output from AVDEC is input to the
AC-3 decoder (IC104) via DIR (IC102) and M G/A (IC101). In the AC-3 decoder (IC104), the
data is processed for three lines, and sent to the AU-197 board DF/GAC via the M G/A (IC101).
– 26 –
IC214
NJM4580
IC001
NJM4556
HP L
HP R
L
R
J001
R
L
AU197 board
HP-96 board
2-10. Audio L and R 2ch Signal Block
The audio signal data for 2 channels of the MB-78 board AV decoder IC203 (L64020) is passed
through IC101MGA, passed through the digital filter in the AU197 board IC215 (CXD8750),
converted to analog signal in the DAC, and passed through the LDF to become the line out
signal.
Figure 2-14. 2ch signal block
The line out signal line is also branched out to IC214 to become the headphones amplifier
output.
Figure 2-15. Headphones amplifier
1
|
3
54
|
56
15
|
17
13
VOUT L
IC206
IC207
IC207
NJM4580
Secondary LPF
Line out
MB-78 board
AU-197 board
IC215
CXD8750
IC101
CXD8746
L
R
VOUT R
16
MGA
Digital filter
DAC
From
IC203
AV Decoder
AV DATA
AV LRCK
AV BCK
AV LRCK
AV BCK
KR DATA
KR LRCK
KR BCK
KR LRCK
KR BCK
– 27 –
2-11. Audio 5.1ch Signal Block
The AC3 decoded signal DD-DATA C/R/F output from the MB-78 board IC101 MGA
(CXD8746) is input together with DD BCK and DD LRCK to IC203, IC204, and IC205
(CXD8750) of the AU-197 board, passed through the digital filter, and converted to the analog
signal in DAC.
The front L and R signals are then passed through IC203 of the AU-197 board, gain-controlled
at IC353 (BU4053B), and noise-eliminated at the secondary LPF IC208, IC211 (NJM4580) to
become the external output of the front L and R.
The sound L and R, and center sub woofer signals are passed through IC204 and IC205 without
being gain-controlled, and noise-eliminated in the secondary LPF IC209, IC212, IC210 and
IC213 (NJM4580) to become the external output.
From
IC101 MGA
MB-78 board
3
13
14
4
16
13
IC353
BU4053B
IC203
CXD8750
DF/DAC
FOR L, R
DD LRCK
DD DATAF
DD BCK
DD DATAF
DD BCK
L
R
5.1ch OUT
IC208, 211
NJM4580
1
|
3
16
13
IC204
CXD8750
DF/DAC
FOR SL, SR
DD LRCK
DD DATAR
DD BCK
DD DATAR
DD BCK
SL
SR
IC209, 212
NJM4580
1
|
3
16
13
IC205
CXD8750
DF/DAC
CENTER
SUB WOOFER
CENTER
SUB WOOFER
DD LRCK
DD DATAC
DD BCK
DD DATAC
DD BCK
IC210, 213
NJM4580
1
|
3
9 • 11
GAIN6
2nd LPF
2nd LPF
2nd LPF
Figure 2-16. 5.1ch Signal Block
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