NJU26106
Dolby Pro Logic II / Virtual Dolby Surround Decoder
■
General Description
The NJU26106 is a digital audio signal decoder that provides the function of Dolby
Pro Logic II and Virtual Dolby Surround.
The NJU26106 processes the stereo matrix-encoded signal into spacious sound
of 5.1 channels by Dolby Pro Logic II and Bass Management System. Also non
matrix-encoded audio signal can be processed into effective spacious sound by
Music mode.
The decoded 5-channel signal can be downmixed into 2-channel virtual surround
output by the Dolby Virtual technology.
The NJU26106 is suitable for multi-channel products such as AV AMP and Car
Audio, or ordinary audio products such as small speaker system.
■
Package
NJU26106FR1
■
FEATURES
•
5.1 Channel signal outputs by Dolby Pro Logic II
•
2 Channel outputs by Virtual Dolby Surround
•
Movie mode / Music mode
•
Available for Center width control, Dimension control, Panorama mode
Music mode and Custom mode
■
Digital Signal Processor Specification
•
24bit Fixed-point Digital Signal Processing
•
Maximum System Clock Frequency
: 38MHz
•
Digital Audio Interface
: 2Input ports / 3 Output ports
•
Master / Slave Mode
•
Master Mode MCK
:1/2 fclk, 1/3 fclk
ex. MCK = 384Fs(1/2) or MCK = 256Fs(1/3) at fclk=768Fs
•
Two kinds of micro computer interface
・
I
2
C bus (standard-mode/100kbps)
・
Serial interface (4 lines: clock, enable, input data, output data)
•
Power Supply
: 2.5V ( 3.3V Input tolerant )
•
Package
: QFP32-R1
The detail hardware specification of the NJU26106 is described in the “ NJU26100 Series Hardware Data
Sheet”.
Ver.2004-08-26
-1-
NJU26106
■
DSP Block Diagram
Fig. 1 NJU26106 Block Diagram
AD1/SDIN
AD2/SSb
NJU26106
DSP ARITHMETIC UNIT
SERIAL AUDIO
INTERFACE
BCKO
LRO
24-BIT x 24-BIT
MULTIPLIER
ALU
L/R
SDO0
SDI0
SDI1
C/LFE
SDO1
BCKI
SL/SR
SDO2
LRI
SCL/SCK
SDA/SDOUT
SERIAL
HOST
INTERFACE
PROGRAM
CONTROL
RESETb
MCK
XI
XO
TIMING
GENERATOR
ADDRESS GENERATION UNIT
DELAY
RAM
DATA
RAM
FIRMWARE
ROM
GPIO AND
CONFIGURATION
INTERFACE
SEL1
■
Pro Logic II & Virtual Dolby Surround Decoder
Fig. 2 NJU26106 Function Diagram
ProLogicII and Virtual Dolby Surround Decorder Block Diagram
Lt
ProLogic II
Rt
L
C
R
Ls
Rs
Scale
Scale
Scale
Scale
Scale
L
C
R
Bass
Management
Ls
Rs
SW
Left Output
Right Output
Master
Volume
Scale
L/R
Balance
Center Output
Subwoofer
Output
LeftSurround
Output
RightSurround
Output
Virtual Dolby Surround
L
R
Delay
Noise Generator
-2-
Ver.2004-08-26
NJU26106
■
Pin Configuration
VDDR
VDDR
VDDC
VDDC
VSSC
VSSR
24
VSSR
23
VSSC
22
21
20
19
18
17
SDI0
SDI1
TEST1
LRI
BCKI
MCK
BCKO
LRO
Fig. 3 NJU26106 Pin Configuration
25
TEST0
VSSC
VDDC
RESETb
VSSO
XO
XI
VDDO
16
26
15
27
14
28
NJU26106
13
29
30
31
32
1
12
11
10
9
2
3
4
5
6
7
8
SDO2
SDO1
SDO0
SEL1
SCL/SCK
SDA/SDOUT
AD1/SDIN
AD2/SSb
■
Pin Description
Table 1 Pin Description
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Symbol
SDO2
SDO1
SDO0
SEL1
SCL/SCK
SDA/SDOUT
AD1/SDIN
AD2/SSb
VDDO
XI
XO
VSSO
RESETb
VDDC
VSSC
TEST0
I/O
O
O
O
I
*2
I
I/O
I
I
--
I
O
--
I
--
--
I/O
Description
Audio Data Output 2
Sl / Sr
Audio Data Output 1
C / SW
Audio Data Output 0 L/R
Select I
2
C or Serial bus
I
2
C Clock / Serial Clock
I
2
C I/O / Serial Output
I
2
C Address / Serial Input
I
2
C Address / Serial Enable
OSC Power Supply +2.5V
X’tal Clock Input
OSC Output
OSC GND
RESET (active Low)
Core Power Supply +2.5V
Core GND
Open
No.
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Symbol
VDDC
VDDC
VSSC
VSSC
VDDR
VDDR
VSSR
VSSR
SDI0
SDI1
TEST1
LRI
BCKI
MCK
BCKO
LRO
I/O
--
--
--
--
--
--
--
--
I
I
I
I
I
O
O
O
Description
Core Power Supply +2.5V
Core Power Supply +2.5V
Core GND
Core GND
I/O Power Supply +2.5V
I/O Power Supply +2.5V
I/O GND
I/O GND
Audio Data Input 0 L/R
Audio Data Input 1 L/R
Connect to GND
LR Clock Input
Bit Clock Input
Master Clock Output
Bit Clock Output
LR Clock Output
*1 I : Input, O : Output, I/O : Bi-directional
*2 SEL1 : Input
Ver.2004-08-26
-3-
NJU26106
■
Audio Data Output
The NJU26106 audio interface provides Industry standard serial data formats of I
2
S, MSB-first left-justified or MSB-first
right-justified. The NJU26106 audio interface provides two data inputs, SDI0 and SDI1, and three data outputs, SDO0,
SDO1 and SDO2, as shown in fig.1. The input serial data is selected by the firmaware command. In Virtual Dolby
Surround mode, SD0 output generates Lch. and Rch. signal. The other channels are muted. The input serial data is
selected by the firmaware command.
Table 2
Pin No.
25
26
Serial Audio Input Pin
Symbol
SDI0
SDI1
Description
Audio Data Input 0 L / R
Audio Data Input 1 L / R
Table 3
Pin No.
3
2
1
Serial Audio Output Pin
Symbol
SDO0
SDO1
SDO2
Description
Front Lch/Rch Output(*)
Center/Sub Woofer Output
Rear Lch/Rch Output
(*) In Virtual Dolby Surround mode, only front Lch/Rch output signal. The other channels are muted.
■
I C address
2
AD1 and AD2 pins are used to configure the seven-bit SLAVE address of the serial host interface. These pins offer
additional flexibility to SLAVE addresses. In the NJU26106, AD2-pin should be connected to “H”. 2 kinds of addresses
could be chosen for AD1. The AD1 address is decided by the connection of AD1-pin. The AD1 address should be the
same level as AD1-pin.
.
Table 4
I
2
C Bus SLAVE Address
bit0
R/W
bit7
bit6
bit5
bit4
Bit3
bit2
bit1
1
0
0
1
1
1
AD2*
AD1*
2
*1 AD2-pin should be connected to high level. AD2 address should be 1.
*2 AD1 address is 0 when AD1-pin is “L”. AD1 address is 1 when AD1-pin is “H”.
The detail
I
2
C
bus timing of the NJU26106 is described in the “ NJU26100 Series Hardware Data Sheet”.
-4-
Ver.2004-08-26
NJU26106
■
NJU26106 Bass Management
1. The specification of Bass Management is the extended version from Dolby.
2.
The 4 types of crossover frequencies for speaker are selectable. ( fig. 5, 6 )
100, 150, 200, 250Hz ( 12dB / Oct. )
3. The 4 types of low frequency destinations are selectable. ( fig. 4 )
Subwoofer, Left / Right, Left Surr / Right Surr, Left / Right + Left Surr / Right Surr
Fig. 4 Bass Management Function Block Diagram
NJU26106 Pro Logic II Bass Management
LPF
Delay &
Attenuator
LPF
Attenuator
FRONT
REAR
SUB
Subwoofer
Lt
HPF
Thru
L
Lt
C
Left
Center
Right
Left
Surround
Right
surround
BM
Thru
Rt
HPF
Pro Logic II
R
Decoder
Rt
Ls
Rs
BM
Crossover Frequency for BM
100/150/200/250Hz 12dB/oct
Ver.2004-08-26
-5-
FPGA/CPLD
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