PRELIMINARY DATA
February 2005
1/157
Rev. 1
Key Features
Fully Automatic Multi-Standard Demodulation
M/N standards
FM mono
BTSC (US MTS) stereo and SAP standards
Multi-Channel Capability
3 IS digital inputs, S/PDIF (in/out)
5.1 analog outputs
Dolby
Pro Logic
Dolby
Pro Logic II
2 IS digital outputs (TQFP100 only)
2 asynchronous IS digital inputs (TQFP100 only)
Sound Processing
ST royalty-free processing: ST WideSurround, ST
OmniSurround, ST Dynamic Bass, ST Bass
Enhancer, SRS
WOWTM , SRS TruSurround
XT
TM which is Virtual Dolby Surround and Virtual
Dolby
Digital compliant
Independent Volume / Balance for Loudspeakers
and Headphone
Loudspeakers: Smart Volume Control (SVC),
5-band equalizer and loudness
Headphone: Smart Volume Control (SVC), bass-
treble, loudness, ST Dynamic Bass and SRS
TruBass
TM
3 different bip tones
Analog Audio Matrix
4 stereo inputs or 5 stereo inputs (TQFP100 only)
3 stereo outputs
Pass-thru mode
Audio Delay for Audio Video Synchronization
Embedded stereo delay up to 120 ms for lip-sync
function
Independent delay on headphone and loudspeaker
channels
External additional audio delay support (TQFP100
only)
The STV82x8 family, based on audio digital signal
processors (DSP), performs high quality and advanced
dedicated digital audio processing.These devices
provide all of the necessary resources for automatic
detection and demodulation of analog audio
transmissions for USA, Taiwanese, Brazilian etc.
terrestrial analog TV broadcasts.
Virtual or true multi-channel capabilities and easy digital
links make them ideal for digital audio low cost consumer
applications. Starting from enhanced stereo up to
independent control of 5 loudspeakers and a subwoofer
(5.1 channels), the STV82x8 family offers standard and
advanced features plus sound enhancements, spatial
and virtual effects to enhance television viewer comfort
and entertainment.
Typical Applications
Analog and digital TV with virtual surround sound
Analog and digital TV with multi-channel surround
sound
DVD and HDD recorders
"Palm size" portable TV
TQFP80 Package
ST
V8
2x
8
TQFP100 Package
ST
V8
2x
8
2004 SRS Labs, Inc. All rights reserved, SRS and
the SRS logo are registered trademarks of SRS Labs, Inc.
"Dolby", "Pro Logic", and the double-D symbol are trademarks of
Dolby Laboratories.
STV82x8
Digital Audio Decoder/Processor
for BTSC Television/Video Recorders
STV82x8
2/157
Figure 1: STV82x8 Block Diagram (TQFP80)
LS_C
LS_SUB
Output
Anal
og
A
udi
o
Mat
r
i
x
I
nput
An
alog
A
udi
o
Mat
r
i
x
A
udio
A/
D
I
C
C
l
o
c
k
Gener
at
or
H
eadphone
V
o
lum
e
,
Balance
,
Loudness
Smar
t V
o
lum
e
C
ont
rol
Loudspe
aker
s
Dela
y
,
Equaliz
er
, Loudness
ST Wide
Sur
r
ound,
ST Dynamic Bass
,
Sm
ar
t V
o
lume
Cont
rol,
Audio Matrix
Back-end Processing and Pre-scaler
A
u
toma
tic
AG
C
BT
SC
Di
gi
tal
IRQ
S/
PD
IF
i
n
Detection
Mo
no In
put
SC1
_
IN
_L
LS
_
L
Headpho
ne
HP_LSS_L
SC
L
S
D
A
SI
F
Bass Management,
Bip tones
S
R
S W
O
W
TM
or
T
r
uSurr
oundTM
Digit
a
l A
u
di
o
Pr
ocessing
SR
S
T
r
uBassTM
De
coder
A
udio
DA
C
A/
D
0.9
V
RM
S
2V
RMS
SC
AR
T
Digi
tal A
udio
Pr
ocessi
ng
Sou
nd IF
MONO_IN
SC1_I
N_R
SC2_IN_L
SC2_
IN_R
SC3_IN_L
SC3_
IN_R
SC4_IN_L
SC4_
IN_R
In
pu
ts
CLK_
SEL
XT ALI
N
XT A
LO
UT
SC1_OUT
_L
SC
AR
T
SC1_OUT_
R
SC2_OUT
_L
SC2_OUT_
R
SC3_OUT
_L
SC3_OUT_
R
Out
put
s
HP_
L
SS_R
Headp
hon
e /
LS_R
Lo
udsp
eaker
s
Dolb
y
Pro
Logic
IC
Do
l
b
y
Pr
o Logic I
I
,
ST O
m
niS
u
r
r
ound,
ST B
a
ss
Enhancer
A
udio
DA
C
0.9
V
RM
S
0.
9
V
RM
S
A
udio
DA
C
Audio
DAC
ST
D
y
namic Bass
, Bass/T
r
eb
le
Vo
l
u
m
e
Balance
Mu
t
e
2V
RM
S
2V
RMS
mat
r
i
x
S/
PD
IF
out
I
S
In
ter
f
ace
S_CLK
DATA_0
DATA_1
DATA_2
In
te
rf
a
c
e
Detection &
Smar
t
C
o
nt
rol
LR_CLK
Su
rr
ou
nd
O_P
C
M
_
C
L
K
IS
In
pu
ts
/
O
u
t
p
u
t
3/157
STV82x8
Figure 2: STV82x8 Block Diagram (TQFP100)
LS_
C
LS_
S
UB
Output
Ana
l
og
A
udi
o
Mat
r
i
x
I
nput
Analo
g
A
udio
Ma
t
r
i
x
A
udio
A/
D
IC
C
l
o
c
k
Gener
a
t
or
Headph
one
Dela
y
,
Ba
s
s
/T
reb
l
e
,
Loudness
,
Smar
t V
o
lum
e
C
ont
rol,
Loudspeaker
s
Dela
y
,
Equaliz
er
,
Loudness
ST W
i
deSurround,
ST D
y
nam
ic
Bass
,
Smar
t V
o
lum
e
C
ont
rol,
Audio Matrix
Back-end Processing and Pre-scaler
Au
t
o
m
a
t
i
c
AG
C
BT
S
C
Digital
IRQ
S/
PD
IF in
Det
e
cti
o
n
Mono I
nput
SC1_IN_L
LS_L
Headp
hone
HP_LSS_L
SC
L
S
D
A
SI
F1
Bass
M
anagement,
Bip t
ones
SRS
WO
W
TM
or
T
r
uSurr
ound XT
TM
Digi
tal
A
udio
P
r
ocessi
ng
SR
S
T
r
ubass
TM
,
Decoder
A
udio
DA
C
A/D
0.
9 V
RMS
2V
RMS
SC
AR
T
Digi
tal
A
udio
Pr
ocessi
ng
Sou
nd IF
MONO_I
N
SC1_
IN_R
SC2_I
N_L
SC2_IN_R
SC3_I
N_L
SC3_IN_R
SC4_I
N_L
SC4_IN_R
Inp
u
t
s
CLK_SE
L
XT ALI
N
XT A
LOU
T
SC1_
OU
T_L
SC
AR
T
SC1_OUT
_R
SC2_
OU
T_L
SC2_OUT
_R
SC3_
OU
T_L
SC3_OUT
_R
Output
s
HP_LSS_R
Head
pho
ne / Surr
oun
d
LS_
R
L
oud
speaker
s
Do
l
b
y
Pr
o Logic
I
C
Dolb
y
P
r
o
Logic II
,
ST
Om
niSurr
ound, S
T
Bass
Enhancer
SC5_I
N_L
SC5_IN_R
A
udio
DA
C
0.
9 V
RMS
0.9
V
RM
S
A
udio
DA
C
Audio
DAC
SI
F2
ST Dynamic
Bass
,
Bip
tones
Vo
l
u
m
e
Bal
a
nce
Mute
2V
RMS
2V
RM
S
ma
t
r
i
x
I
S Ou
tp
ut
s
O_D
A
T
A
_0
O_D
A
T
A
_1
O_LR_CLK
O_SCLK
PC
M_C
L
K
S/
PD
IF out
IS
in
t
e
rf
a
c
e
SCLK
LR_CLK
DATA_0
DATA_1
DATA_2
A_S_CLK
A_LR_CLK
A_DATA
Int
e
r
f
ace
Dete
cti
on &
Smar
t
Control
I
S Inp
u
t
s
/Out
pu
ts
D_DATA
STV82x8
4/157
Table of Contents
Chapter 1
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
1.1
STV82x8 Overview ............................................................................................................ 13
1.1.1
Core Features ..........................................................................................................................................13
1.1.2
Software Information ...............................................................................................................................14
1.1.3
Electrical Features ...................................................................................................................................14
1.2
Typical Applications ........................................................................................................... 15
Chapter 2
System Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Chapter 3
Digital Demodulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
3.1
Sound IF Signal .................................................................................................................. 19
3.2
Demodulation ..................................................................................................................... 19
Chapter 4
Dedicated Digital Signal Processor (DSP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
4.1
Back-end Processing ......................................................................................................... 21
4.2
Audio Processing ............................................................................................................... 22
4.3
ST WideSurround ............................................................................................................... 24
4.4
ST OmniSurround .............................................................................................................. 25
4.5
Dolby Pro Logic II Decoder ................................................................................................ 25
4.6
Bass Management ............................................................................................................. 25
4.6.1
Bass Management Configuration 0 .........................................................................................................26
4.6.2
Bass Management Configuration 1 .........................................................................................................26
4.6.3
Bass Management Configuration 2 .........................................................................................................27
4.6.4
Bass Management Configuration 3 .........................................................................................................28
4.6.5
Bass Management Configuration 4 .........................................................................................................29
4.7
SRS WOW and TruSurround XT ...................................................................................... 29
4.7.1
SRS TruSurround ....................................................................................................................................29
4.7.2
SRS WOW ...............................................................................................................................................30
4.8
Smart Volume Control (SVC) ............................................................................................. 30
4.9
ST Dynamic Bass/ST Bass Enhancer ............................................................................... 31
4.10
5-Band Audio Equalizer ..................................................................................................... 31
4.11
Bass/Treble Control ........................................................................................................... 31
4.12
Automatic Loudness Control .............................................................................................. 32
4.13
Volume/Balance Control .................................................................................................... 32
4.14
Soft Mute Control ............................................................................................................... 33
4.15
Beeper ................................................................................................................................ 33
5/157
STV82x8
Chapter 5
Analog Audio Matrix (Input / Output) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Chapter 6
IS Interface (In / Out) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
6.1
IS Inputs ............................................................................................................................ 36
6.1.1
IS Inputs in TQFP 80 Package ...............................................................................................................36
6.1.2
IS Inputs in TQFP 100 Package .............................................................................................................37
6.2
IS Outputs ......................................................................................................................... 37
6.2.1
IS Outputs in TQFP 80 Package ............................................................................................................37
6.2.2
IS Outputs in TQFP 100 Package ..........................................................................................................38
Chapter 7
S/PDIF Input/Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Chapter 8
Power Supply Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
8.1
Standby Mode (Loop-through mode) ................................................................................. 41
Chapter 9
Additional Controls and Flags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
9.1
Headphone Detection ........................................................................................................ 42
9.2
IRQ Generation .................................................................................................................. 42
9.3
IC Bus Expander ............................................................................................................... 42
Chapter 10
STV82x8 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Chapter 11
IC Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
11.1
IC Address and Protocol ................................................................................................... 44
11.2
Start-up and Configuration Change Procedure .................................................................. 45
Chapter 12
Register List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
12.1
IC Register Map ................................................................................................................ 47
12.2
Software Registers ............................................................................................................. 49
12.3
STV82x8 General Control Registers .................................................................................. 53
12.4
Clocking 1 .......................................................................................................................... 56
12.5
Demodulator ....................................................................................................................... 58
12.6
Demodulator Channel 1 ..................................................................................................... 61
12.7
I2S and Analog Control ...................................................................................................... 69
12.8
Clocking 2 .......................................................................................................................... 72
12.9
DSP Control ....................................................................................................................... 73
12.10
Automatic Standard Recognition ........................................................................................ 78
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