Circuit Descriptions, Abbreviation List, and IC Data Sheets
9.
9.6
Video: TV Part (diagrams A1, A2, and A3)
The video processing is completely handled by the Hercules
•
IF demodulator.
•
Chrominance decoder
•
Sync separator.
•
Horizontal & vertical drive.
•
RGB processing.
•
CVBS and SVHS source select.
It has also build in features like:
•
CTI.
•
Black stretch.
•
Blue stretch.
•
White stretch.
•
Slow start up.
•
Dynamic skin tone correction etc.
Further, it also incorporates sound IF traps and filters, and
requires only one crystal for all systems.
9.6.1
Histogram (YUV picture improvement) IC
The demodulated video-signal can be checked on pins 74, 75,
and 76 of IC7011 and is fed to pins 70, 71, and 72. In this path,
the Histogram IC TDA9171 is inserted.
This TDA9178 can control various picture improvements:
•
Histogram processing.
•
Colour transient improvement.
•
Luminance transient improvement.
•
Black and white stretch.
•
Skin tone correction.
•
Green enhancement.
•
Blue stretch.
•
Smart peaking.
•
Video dependent coring.
•
Colour dependent stretching.
Since the TDA9171 is connected to the Hercules, picture
improvement works only for signals that are routed through the
Hercules and not for signals directly connected to the Scaler.
9.7
Video: Scaler Part (diagram A7 and A13)
The Genesis GM1501 Scaler is a dual channel graphics and
video processing IC for flat monitors and televisions
incorporating Picture in Picture, up to SXGA output resolutions.
The Scaler controls the display processing in a FTV, e.g. like
the deflection circuit in a CRT-based TV. It controls all the view
modes (e.g. like "zooming" and "shifting"). Features like PC
(VGA) or HD inputs, are also handled by this part.
9.7.1
Features
The Scaler provides several key IC functions:
•
Scaling.
•
Auto-configuration/ Auto-Detection.
•
Various Input Ports:
–
Analog RGB.
–
Video Graphics.
•
Integrated LVDS Transmitter.
•
On-chip Micro-controller
9.7.2
Inputs
Analog RGB
The RGB input is fed to pins B2, C2 and D2. This input consists
of either the Hercules RGB output or the RGB/YpbPr input of
the VGA connector. The Scaler can switch between the two
signals via the PC_HD_SEL signal and selection IC SM5301.
PC (VGA) input
The VGA input is processed by the VGA block of the Scaler.
The Scaler supports pixel frequencies up to 165MHz.
YpbPr format is also supported via the VGA interface and
covers resolutions of 480p/560p/720p/1080i.
9.7.3
Output
The Display Output Port provides data and control signals that
permit the Scaler to connect to a variety of display devices
using a TTL or LVDS interface. The output interface is
configurable for single or dual wide TTL/LVDS in 18, 24 or 30-
bit RGB pixels format. All display data and timing signals are
synchronous with the DCLK output clock. The integrated LVDS
transmitter is programmable to allow the data and control
signals to be mapped into any sequence depending on the
specified receiver format.
9.8
Audio Processing
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 and 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.
9.8.1
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 any more 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
Side in
*
All region
SCART1 out
*
Europe only
SCART2 out
*Europe only
Monitor out
*
N
ot a
v
aila
b
le
SCART2 in
*Europe only
AV2 in
*
AP/USA/Latam
AV1 in
*
AP/USA/Latam
SCART1 in
*Europe only
Lip Sync
Circ
u
it
2x
Amplifier
Amplifier
PC in
HDMI
DAC
HEF4053
3X SPDT
PC_HDMI_AUD_SEL
(From Scaler,
GPIO_G07_B0)
AUDIO-OUTSL
AUDIO-OUTSR
AUDIO-OUTHPL
AUDIO-OUTHPR
Constant Level Out
*
Europe only
AUDIO-LSL
AUDIO-LSR
Tuner
SIF
Is used on the DMMI
=> No SCART2/AV2 for
Bolt-on
AUDIO-I
N
5L
AUDIO-I
N
5R
AUDIO-I
N
3L
AUDIO-I
N
3R
AUDIOI-
N
4L
AUDIO-I
N
4R
AUDIO-I
N
2L
AUDIO-I
N
2R
SIF Inp
u
t
106
105
103
P0.0/I2SDI1
P0.0/I2SDO1
P0.3/I2SCLK
I2S
FM
SSIF Inp
u
t
2x Stereo
Speaker
Headphone
Hercules
For iT
V
only
E_14490_061.eps
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