Specifications

Circuit Descriptions, List of Abbreviations, and IC Data Sheets
EN 82 L05U AA9.
For more details on the option settings, please refer to chapter
8 “Alignments”.
9.3.2 Audio Source Selection
The signals coming out of the DEMDEC (internal demodulator/
decoder block of the Hercules) are selectable and consist of
the following (depending on the transmission):
• DEC L/R (Can be NICAM, FM 2CS, or BTSC Stereo).
• Mono (Refers to fallback/forced Mono in Stereo
Transmission).
•SAP.
For L05, the assigned I/O with respect to the Hercules is as
follows:
• AV1 Input assigned to Audio In 5.
• AV2 Input assigned to Audio In 3.
• Side AV Input assigned to Audio In 4.
• External Interface Input assigned to Audio In 2.
• Constant Level Output assigned to Loudspeaker Output.
9.3.3 Video Source Selection
Video source selection is done inside the Hercules. Therefore
it provides a video switch with 3 external CVBS inputs and a
CVBS output. All CVBS inputs can be used as Y-input for Y/C
signals. However, only 2 Y/C sources can be selected because
the circuit has 2 chroma inputs.
The selected input signal is fed to the HD panel for further
processing.
9.4 Video Processing
The Video Processing is divided into two sections, one for the
processing of 1fH NTSC signals (by the Hercules), and a
second for the processing of 2fH signals (on the HD panel, by
the Trident chip).
The tuner is only one of the sources of video signal for the
Hercules. The tuner is controlled by the Hercules. The
Hercules also receives video signals from AV2 and the Side I/
O panel.
If an NTSC signal is selected by the user, the selected CVBS
signal is output to two different lines. One CVBS line goes to
the Trident chip, IC 7201, on the HD panel. CVBS_TXT signals
are fed to IC 7206 on the HD panel, which is able to process
Closed Caption text or Teletext. This IC also generates the
OSD texts.
If the TV set receives a 2fH signal (via one of its HDMI panel
inputs, i.e. the CVI/YPbPr or the HDMI input), the signal is fed
to a selector switch on the HD panel, IC 7205. The selected
signal (component video or RGB) is fed to an AD converter, IC
7210. The digital signal coming from the AD converter is fed to
the Trident chip, IC 7201. This IC enhances the video quality of
the picture and scales the picture to the 1080i format. The
analog RGB signal coming from the Trident chip is fed to the
display processor, IC 7221. Here, the picture control functions
are performed, as well as the insertion of OSD. Then, the
processed videosignal is fed to the CRT panel.
Some features:
• Full YUV-loop interface (alternative functions: DVD, RGB
or Y/C).
• Internal OSD insertion (not Saturation or Contrast
controlled).
• Double window implementation.
• Linear / non linear scaling for 16:9 sets.
• Tint (hue) on UV signals (including DVD).
• Peaking, Coring, Black \ Blue \ White-stretch.
• Transfer-Ratio and Scavem (also on TXT).
9.4.1 Block Diagram
Following diagram is the block diagram of the video processing
part:
Figure 9-1 Video processing block diagram
9.5 Audio Processing
The audio decoding is done entirely via the Hercules, IC 7200.
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 analog 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.
Audio is included in the HDMI bit stream. Digital audio from
IC7002 is fed to an audio DAC, IC 7011. The audio signal from
the DAC is fed to IC 7050, a switch, of which only one input is
used. The output of the switch is fed to the Hercules chip, IC
7200.
Audio for the CVI input should be inserted into AV1. Pins 68
and 69 of the Hercules provide the audio signal for the two-
channel 20 W Audio Amplifier, IC 7990.
TUNER
VIDEO
SAW
AV1
CVI
AUDIO
SAW
HDMI
SOURCE
SELECT
HERCULES
CVBS/AUDIO
REAR/SIDE
INPUT/OUTPUT
HOP
RGB RGB
CRT
F_15050_071.eps
180205
DPTV
ADC
PAINTER
CVBS_TXT
CVBS_OUT
L05U_AA_312278515051.book Page 82 Friday, March 4, 2005 10:42 AM