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Circuit Descriptions, Abbreviation List, and IC Data Sheets
9.2
Power Supply
9.2.1
DC/DC converters
For a (more) detailed description of the on-board DC/DC
converters of the SSB see the BP2.xU Service Manual.
9.2.2
PSU's
For a (more) detailed description of the used LCD Power
Supply Units see e.g. the BJ3.0x and FJ3.0x manuals.
9.3
Front-End
I2C on MMbus1,
@C0
SAW
VIDEO-IF
MAIN
TUNER
Broadband
SAW
SOUND-IF
IF output
ANALOG ONLY
AGC1
IF FILTERING
Figure 9-3 Block diagram analogue front-end
Main goal of the front-end module is to connect the host (core
with source processing) with the outside world via an RF
connector. For an analogue application the connection to the
outside world is through analogue broadcasts via terrestrial
connection. The analogue sets that use this chassis use the
UDA1318 as tuner, which delivers the analogue front-end as
depicted in figure "Block diagram analogue front-end".
For a DVB-T application the connection to the outside world is
through DVB broadcasts via terrestrial connection. It delivers a
number of digital broadcasts services, grouped into a
frequency spectrum. The front-end module processes one
channel and forwards the digital channel to the core as MPEG
data packets at the demodulator's output. To maintain common
naming with an ATSC application this path is also referred to as
the 'in-band' signal path.
DSM RC-filter
RF AGC monitoring
Main tuner
diff. IF @ 36.16 MHz
RF in
TD1316AF -3
1-858 MHz
4MHz clock
IF AGC control
Main MPIF
5V
analog demodulation
stab
Figure 9-4 Block diagram DVB-T front-end
I2C DMAbus
@9E
I2D-datalinks 1-2-3 **
AVIP 1
CLK 13.5MHz
MAIN-MPIF
(MAIN)
HV-PRM-MAIN
(HV Sync)
PNX2015
3V3
Power supply
control circuit
+ ADC
comparator
5V
5V
1V8 stab 3V3 delayed
Channel Decoder
Channel Decoder
TDA10046AHT
TDA10046AHT
DSM
RC-filter
JTAG
CI
control
I2C local
reset
(addr 0xC0)
I2C DMA
(addr 0x14)
9.4
Common Interface (CI)
9.4.1
Introduction
The digital sets of this chassis are provided with a special slot
(Common Interface - CI). Together with a Conditional Access
Module (CAM) and a smart card it is possible to receive
scrambled TV programs. This means that it is not necessary to
have a separate Set Top Box to receive digital cable SDTV and
HDTV programs (however this is still possible).
The removable smart card, distributed by cable companies,
allows you to tune digital and high definition scrambled or
encrypted cable channels through the cable antenna. The
smart card is also required to receive premium digital TV
channels and services (where available) through the cable. A
smart card functionality includes conditional access and copy
protection.
9.4.2
Implementation
1. The receiver receives the digital data stream.
2. The data flows into the Conditional Access Module, which
G_15970_052.eps
contains the content provider's unscrambling algorithms.
080307
3. This module verifies the existence of a smart card that
contains the subscriber's authorization code.
4. If the authorization code is accepted, the CAM
unscrambles the data and returns the data to the receiver
(if the code is not accepted, the data remains scrambled,
restricting access).
5. The receiver then decodes the data and outputs it for
viewing.
FAT
RF
FDC
Figure 9-5 In Band channel reception (without CAM inserted)
FAT
RF
FDC
8
TS data
TS CL
TS con
2
Figure 9-6 In Band channel reception (with smart card inserted)
G_15960_1
BJ3.1A LA
FRONT-END
TUNER
DEMOD
MPEG
MPEG
(SCRAMBLED)
(DESCRAMBLED)
QPSK
DEMOD
RX
BYPASS
EMM
QPSK
MESSAGES
SYMBOLS
7P03
HOST-POD INTERFACE CONTROLLER CHIP
STV0701
OOB
CAS
PROCESSOR
PROCESSOR
POD MODULE
FRONT-END
1
TUNER
DEMOD
MPEG
MPEG
(SCRAMBLED)
(DESCRAMBLED)
QPSK
DEMOD
4
RX
BYPASS
EMM
QPSK
2
COMMANDS
MESSAGES
SYMBOLS
7P03
HOST-POD INTERFACE CONTROLLER CHIP
STV0701
OOB
CAS
3
PROCESSOR
PROCESSOR
POD MODULE
9.
EN 141
VIPER
A/V
DEMUX
DECODER
CPU
COMMANDS
F_15400_073.eps
130505
VIPER
5
A/V
DEMUX
DECODER
CPU
F_15400_074.eps
300505
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