®
STV82x7
Digital Audio Decoder/Processor
for A2 and NICAM Television/Video Recorders
PRELIMINARY DATA
Key Features
■
Full-Automatic Multi-Standard Demodulation
B / G / I / L / M / N / D / K Standards
●
Mono AM and FM
●
FM 2-Carrier (German and Korean Zweiton) and
NICAM
●
■
Multi-Channel Capability
3 I²S digital inputs, S/PDIF (in/out)
●
5.1 analog outputs
●
Dolby® Pro Logic®
●
Dolby® Pro Logic II®
●
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 STV82x7 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
●
■
Sound Processing
ST royalty-free processing: ST WideSurround, ST
OmniSurround, ST Dynamic Bass, SRS® WOW™,
SRS® TruSurround XT™ 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 and SRS® TruBass™
●
2
V8
ST
x7
®
■
Analog Audio Matrix
4 stereo inputs
●
3 stereo outputs
●
THRU mode
●
■
Audio Delay for Audio Video Synchronization
Embedded stereo delay up to 120 ms for lip-sync
function (up to 180 ms for tuner input)
●
Independent delay on headphone and loudspeaker
channels
●
©
2004 SRS Labs, Inc. All rights reserved, SRS and
the SRS logo are registered trademarks of SRS Labs, Inc.
The STV82x7 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 European and Asian terrestrial TV
broadcasts.
“Dolby”, “Pro Logic”, and the double-D symbol are trademarks of
Dolby Laboratories.
Rev. 3
February 2005
1/149
CLK_SEL
XTALIN
XTALOUT
2/149
I²S
data
clocks
IRQ
S/PDIF
In / Out
Block Diagram
Loudspeakers
Headphone
Detection
Stereo
Audio
DAC
0.9 V
RMS
Control
Logic
I²S
Interface
Pre-scaler
Sound IF
SIF
Headphone
Digital Audio Processing
Volume, Balance, Loudness,
Smart Volume Control,
Bass/Treble, SRS® Trubass™
Stereo
Audio
DAC
Stereo
Audio
DAC
0.9 V
RMS
Loudspeakers
Digital Audio Processing
Volume, Equalizer, Balance,
Dolby® Pro Logic®
Dolby® Pro Logic II®,
ST WideSurround, ST Dynamic Bass,
ST OmniSurround,
Loudness,Smart Volume Control,
Bass Management, Beeper
SRS® WOW™ or TruSurround XT™
LS_L
LS_R
LS_C
LS_SUB
Digital Audio Matrix
AGC
A/D
Digital
FM/AM
NICAM
FM 2-carrier
Demodulation
Headphone / Surround
HP_LSS_L
HP_LSS_R
Mono Input
MONO_IN
Audio
A/D
SC1_IN_L
SC1_IN_R
2 V
RMS
SC1_OUT_L
SC1_OUT_R
SC2_IN_L
SC2_IN_R
SC3_IN_L
SC3_IN_R
I²C
Interface
Clock
Generator
Input
Analog
Audio
Matrix
Output
Analog
Audio
Matrix
2 V
RMS
SC2_OUT_L
SC2_OUT_R
SC4_IN_L
SC4_IN_R
Power Supply
Management
2 V
RMS
SC3_OUT_L
SC3_OUT_R
SCART
Outputs
SCART
Inputs
SCL
I²C
SDA
STV82x7
STV82x7
Table of Contents
Chapter 1
1.1
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
STV82x7 Overview .............................................................................................................. 8
1.1.1 Core Features ............................................................................................................................................8
1.1.2 Software Information .................................................................................................................................9
1.1.3 Device Input Modes ...................................................................................................................................9
1.1.4 Electrical Features ...................................................................................................................................10
1.2
1.3
Typical Applications ........................................................................................................... 10
Pin Descriptions and Application Diagrams ....................................................................... 14
Chapter 2
Chapter 3
3.1
3.2
System Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Digital Demodulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Sound IF Signal .................................................................................................................. 21
Demodulation ..................................................................................................................... 22
Chapter 4
4.1
4.2
4.3
4.4
4.5
4.6
Dedicated Digital Signal Processor (DSP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Back-end Processing ......................................................................................................... 24
Audio Processing ............................................................................................................... 25
ST WideSurround ............................................................................................................... 28
ST OmniSurround .............................................................................................................. 28
Dolby Pro Logic II Decoder ................................................................................................ 28
Bass Management ............................................................................................................. 28
4.6.1 Bass Management Configuration 0 .........................................................................................................29
4.6.2 Bass Management Configuration 1 .........................................................................................................30
4.6.3 Bass Management Configuration 2 .........................................................................................................31
4.6.4 Bass Management Configuration 3 .........................................................................................................32
4.6.5 Bass Management Configuration 4 .........................................................................................................33
4.7
SRS WOW and TruSurround XT ...................................................................................... 33
4.7.1 SRS TruSurround ....................................................................................................................................33
4.7.2 SRS WOW ...............................................................................................................................................34
4.8
4.9
4.10
4.11
4.12
4.13
4.14
Smart Volume Control (SVC) ............................................................................................. 34
ST Dynamic Bass .............................................................................................................. 35
5-Band Audio Equalizer ..................................................................................................... 35
Bass/Treble Control ........................................................................................................... 35
Automatic Loudness Control .............................................................................................. 36
Volume/Balance Control .................................................................................................... 36
Soft Mute Control ............................................................................................................... 37
3/149
STV82x7
4.15
Beeper ................................................................................................................................ 37
Chapter 5
Chapter 6
6.1
6.2
Analog Audio Matrix (In / Out) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
I²S Interface (In / Out) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
I²S Inputs ............................................................................................................................ 40
I²S Output ........................................................................................................................... 41
Chapter 7
Chapter 8
8.1
S/PDIF Input/Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
Power Supply Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Standby Mode (Loop-through mode) ................................................................................. 43
Chapter 9
9.1
9.2
9.3
Additional Controls and Flag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
Headphone Detection ........................................................................................................ 44
IRQ Generation .................................................................................................................. 44
I²C Bus Expander ............................................................................................................... 44
Chapter 10
Chapter 11
11.1
11.2
STV82x7 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
I²C Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
I²C Address and Protocol ................................................................................................... 46
Start-up and Configuration Change Procedure .................................................................. 47
Chapter 12
12.1
12.2
12.3
12.4
12.5
12.6
12.7
12.8
12.9
12.10
12.11
Register List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
I²C Register Map ................................................................................................................ 49
STV82x7 General Control Registers .................................................................................. 55
Clocking 1 .......................................................................................................................... 56
Demodulator ....................................................................................................................... 59
Demodulator Channel 1 ..................................................................................................... 62
Demodulator Channel 2 ..................................................................................................... 66
NICAM Registers ............................................................................................................... 71
Stereo Mode ....................................................................................................................... 73
Analog Control ................................................................................................................... 74
Clocking 2 .......................................................................................................................... 76
DSP Control ....................................................................................................................... 77
4/149
STV82x7
12.12
12.13
12.14
12.15
12.16
12.17
12.18
12.19
12.20
12.21
12.22
12.23
12.24
Automatic Standard Recognition ........................................................................................ 81
Audio Preprocessing and Selection Registers ................................................................... 85
Matrixing ............................................................................................................................. 93
Audio Processing ............................................................................................................... 98
5-Band Equalizer / Bass-Treble for Loudspeakers .......................................................... 112
Headphone Bass-Treble .................................................................................................. 113
Volume ............................................................................................................................. 116
Beeper .............................................................................................................................. 126
Mute ................................................................................................................................. 127
S/PDIF .............................................................................................................................. 128
Headphone Configuration ................................................................................................ 128
DAC Control ..................................................................................................................... 129
AutoStandard Coefficients Settings ................................................................................. 130
Chapter 13
13.1
13.2
13.3
13.4
13.5
13.6
13.7
13.8
13.9
13.10
13.11
13.12
13.13
13.14
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .132
Absolute Maximum Ratings ............................................................................................ 132
Thermal Data .................................................................................................................. 132
Power Supply Data .......................................................................................................... 132
Crystal Oscillator ............................................................................................................. 133
Analog Sound IF Signal .................................................................................................. 133
SIF to I²S Output Path Characteristics ............................................................................. 134
SCART to SCART Analog Path Characteristics .............................................................. 134
SCART and MONO IN to I²S Path Characteristics .......................................................... 135
I2S to LS/HP/SUB/C Path Characteristics ....................................................................... 135
I²S to SCART Path Characteristics .................................................................................. 136
MUTE Characteristics ...................................................................................................... 136
Digital I/Os Characteristics ............................................................................................... 136
I²C Bus Characteristics
.................................................................................................. 137
I2S Bus Interface .............................................................................................................. 138
Chapter 14
Chapter 15
Chapter 16
Input/Output Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .140
Package Mechanical Data
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .145
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .146
5/149
