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Circuit Descriptions, Abbreviation List, and IC Data Sheets
9.7
Audio Processing
Hercules
SIF
SIF Input
Tuner
SSIF(FM)
SSIF Input
Cinch 1 In (AV1) for
AP/LATAM/USA or
Audio-IN5L(Pin 34)
SCART1 In
Audio-IN5R(Pin 35)
for Europe
Side AV In for all
Audio-IN4L(Pin 49)
Audio-IN4R(Pin 50)
region
Audio-IN2L(Pin 53)
PC Audio In
Audio-IN2R (Pin 54)
Figure 9-3 Block diagram audio processing
The audio decoding is done entirely via the Hercules. The IF
output from the Tuner is fed directly to either the Video-IF or the
Sound-IF input depending on the type of concept chosen.
There are mainly two types of decoder in the Hercules, an
analogue decoder that decodes only Mono, regardless of any
standards, and a digital decoder (or DEMDEC) that can decode
both Mono as well as Stereo, again regardless of any
standards.
In this chassis, the analogue decoder is used in two cases:
•
It is used for AM Sound demodulation in the Europe
SECAM LL' transmission.
•
It is used for all FM demodulation in AV-Stereo sets.
9.7.1
Diversity
The diversity for the Audio decoding can be broken up into two
main concepts:
•
The Quasi Split Sound concept used in Europe and some
AP sets.
•
The Inter Carrier concept, used in NAFTA and LATAM.
The UOC-III family makes no difference anymore between
QSS- and Intercarrier IF, nearly all types are software-
switchable between the two SAW-filter constructions.
Simple data settings are required for the set to determine
whether it is using the Inter Carrier or the QSS concept. These
settings are done via the "QSS" and "FMI" bit found in SAM
mode. Due to the diversity involved, the data for the 2 bits are
being placed in the NVM location and it is required to write once
during startup.
On top of that, it can be further broken down into various
systems depending on the region. The systems or region
chosen, will in turn affect the type of sound standard that is/are
allowed to be decoded.
•
For the case of Europe, the standard consists of BG/DK/I/
LL' for a Multi-System set. There are also versions of
Eastern Europe and Western Europe set and the standard
for decoding will be BG/DK and I/DK respectively. FM
Radio is a feature diversity for the Europe sets. The same
version can have either FM Radio or not, independent of
the system (e.g. sets with BG/DK/I/LL' can have or not
have FM radio).
•
For the case of NAFTA and LATAM, there is only one
transmission standard, which is the M standard. The
diversity then will be based on whether it has a dBx noise
reduction or a Non-dBx (no dBx noise reduction).
•
For the case of AP, the standard consists of BG/DK/I/M for
a Multi-System set. The diversity here will then depends on
the region. AP China can have a Multi-System and I/DK
version. For India, it might only be BG standard.
Audio Power
Amplifier 2x2w
output
(TDA1517ATW
AUDOUTLSL(Pin 60)
2 x 4 ohm
) for 14, 15, 17
AUDOUTLSR(Pin 61)
stereo
speaker
inch
or
Headphone
(1) if HP is
used, the
Amplifier 2x5w
main
output
speakers
(TDA7297D) for
will be
muted.
20,23 inch
AUDOUTSL(Pin 36)
AUDOUTSR(Pin 37)
SCART1 Out
only for Europe
Control Signals
E_14520_048.eps
9.7.2
Functionality
The features available in the Hercules are as follows:
•
Treble and Bass Control.
•
Surround Sound Effect that includes:
–
Incredible Stereo.
–
Incredible Mono.
–
3D Sound (not for AV Stereo).
–
TruSurround (not for AV Stereo).
–
Virtual Dolby Surround, VDS422 (not for AV Stereo).
–
Virtual Dolby Surround, VDS423 (not for AV Stereo).
–
Dolby Pro-Logic (not for AV Stereo).
•
Bass Feature that includes:
–
Dynamic Ultra-Bass.
160904
–
Dynamic Bass Enhancement.
–
BBE (not for AV Stereo).
•
Auto-Volume Leveler.
•
5 Band Equalizer.
•
Loudness Control.
All the features stated are available for the Full Stereo versions
and limited features for the AV Stereo
9.7.3
Audio Amplifier
The audio amplifier part is very straightforward. There are two
different executions:
•
15, 17 inch: Amplification is done via the integrated power
amplifier TDA1517, and delivers a maximum output of 2 x
6 W_rms. Normal operating supply is from 6 V to 18 V.
•
20, 23 inch: Amplification is done via the integrated power
amplifier TDA7297, and delivers a maximum output of 2 x
15 W_rms. Normal operating supply is from 6.5 V to 18 V.
Muting is done via the SOUND_ENABLE line connected to pin
13 of the amplifier-IC and coming from the Hercules.
9.7.4
Audio: Lip Sync
The LC4.1E is not equipped with Lip Sync. This is not needed.
9.8
Control
9.8.1
Hercules
The System Board has two main micro-controllers on board.
These are:
•
On-chip x86 micro-controller (OCM) from Genesis LCD TV/
Monitor Controller.
•
On-chip 80C51 micro-controller from Philips
Semiconductor UOCIII (Hercules) series.
Each micro-controller has it own I2C bus which host its own
internal devices.
The Hercules is integrated with the Video and Audio Processor.
For dynamic data storage, such as SMART PICTURE and
SMART SOUND settings, an external NVM IC is being used.
Another feature includes an optional Teletext/Closed Caption
decoder with the possibility of different page storage depending
on the Hercules type number.
The Micro Controller ranges in ROM from 128 kB with no TXT-
decoder to 128 kB with a 10 page Teletext or with Closed
Caption.
LC4.1E AB
9.
EN 55
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