Circuit Descriptions, List of Abbreviations, and IC Data Sheets
9.
9.8.9
PROZONIC
Figure 9-10 Digital Scan principle
External ICs are connected to the PICNIC depending of the set
features.
For EM1.1Asets with Digital Scan, the PROZONIC (IC7708,
SAA4990H) is placed with two memory ICs (IC7714 and 7715).
It is an abbreviation for PROgressive scan ZOom and Noise
reduction IC. When applying this IC, a second Field Memory is
necessary.
The following functions are available:
•
Line flicker reduction (Digital Scan): this is a feature to
reduce the 30 Hz interlace line flicker.
•
Dynamic Noise Reduction: noise affected signals can be
improved by combining the pixel values of the current and
past video fields. This is however only possible in areas
without movement.
•
Variable Vertical Sample Rate Conversion.
•
Synchronous No Parity Eight bit Reception and
Transmission interface (SNERT-bus).
9.9
Video: High-end Output Processor (HOP) and
TOPIC (diagram B4)
9.9.1
General
The YUV-signals from the PICNIC are fed to the HOP (High-
end Output Processor, TDA9330). The video and geometry
control parts are integrated in the HOP. The RGB-signals for
CC/OSD (from the
µ
P) are also inserted via the HOP. The
geometry part delivers the H-drive, EW-drive, V-drive, and also
a drive signal for rotation.
The main functions of the HOP are:
•
Video control (contrast, brightness, saturation, etc).
•
Second RGB interface for OSD/CC.
•
Peak White Limiting.
•
Cut-off control and White Drive (RGB outputs).
•
Geometry control.
•
Deflection control.
The TOPIC (The most Outstanding Picture improvement IC,
item 7302, type TDA9178) is an
optional
IC between the
PICNIC and the HOP. It has the following (picture
improvement) functions:
•
Luminance Transient Processor (LTP),
for detail
enhancement.
•
Chrominance delay circuitry,
to compensate timing
differences between Y and C.
•
Spectral processor,
for improved sharpness and color
transient improvement (CTI).
•
Color vector processor,
for skin tone correction, green
enhancement and blue stretch.
•
Measure and detection circuitry, for
AutoTV.
The sandcastle pulse from the HOP is fed to pin 1 of the
TOPIC, which is used as a reference for timing.
9.9.2
Video Control
After source selection, the HOP controls the signals for
Saturation, Contrast, and Brightness. Output is RGB again.
9.9.3
OSD/TXT Control
On pins 35 to 38, the RGB and fast blanking from the Painter
(OSD and TXT) are inserted. The sync signal V
SYNC
is derived
from the 'FRAMEDRIVE-" signal.
9.9.4
Peak White Limiting
On pin 43 there is a Peak White Limiting signal line (PWL). If
the beam current increases, the 'EHT-info' voltage will
decrease. Average limiting via R3343/C2333 controls PWL.
9.9.5
Cut-off Control
The following occurs when you switch the TV to Standby:
1.
The vertical scan is completed.
2.
The vertical flyback is completed (the horizontal output is
gated with the flyback pulse, so that the horizontal output
transistor cannot be switched 'on' during the flyback pulse).
3.
The 'slow stop' of the horizontal output is started, by
gradually reducing the 'on' time at the horizontal output
from nominal to zero (this will take 50 ms).
4.
At the same time, the fixed beam current is forced via the
black-current-loop for 25 ms. This is done by setting the
RGB outputs to a maximum voltage of 5.6V.
A
'one-point' cut-off control
is used: A current of 8
µ
A (for cut-
off) is fed to pin 44 of the HOP. This is done with a
measurement pulse during the frame flyback. During the first
frame, three pulses are generated to adjust the cut-off voltage
at a current of 8
µ
A. With this measurement, the black level at
the RGB-outputs is adjusted. Therefore, at start-up there is no
monitor pulse anymore. At start-up, the HOP measures the
pulses, which come back via pin 44. The RGB-outputs have to
be between 1.5 V and 3.5 V. If one of the outputs is higher than
3.5 V or one of them lower than 1.5 V, the RGB-outputs will be
blanked.
9.9.6
Geometry control
All geometry control is performed via I
2
C and the data is stored
in the NVM (IC7011) of the SSB.
9.9.7
Deflection Control
Line Drive
The Line drive is derived from an internal VCO. As a reference,
an external resonator is used (1301). The internal VCO is
locked with the H
D100
-pulse, which comes from the PICNIC.
The 'PHI-2' part of the HOP receives the HFB_X-RAY_PROT
(pin 13) to correct the phase of the Line drive. The EHT-info is
supplied to pin 14 (DYN-PHASE-CORR) to compensate
picture breathing depending on the beam current.
Note:
This is not used in this chassis, therefore EHT-
compensation in the SAM menu is set to zero.
CL 96532156_017.eps
110100
BUS A
BUS
PICNIC/SAA4978H
DIGITAL SCAN
B
BUS
BUS C
BUS
BUS D
M
E
M
1
M
E
M
2
P
R
O
Z
N
I
C
I C
2
Y FEAT
Y DEC
U FEAT
U DEC
V FEAT
V DEC
HD100
HA
VD100
VA
BUS A
BUS
PICNIC/SAA4978H
100Hz CONFIGURATION
B
BUS
BUS C
BUS
BUS D
M
E
M
1
I C
2
Y FEAT
Y DEC
U FEAT
U DEC
V FEAT
V DEC
HD100
HA
VD100
VA
Summary of Contents for EM1.1A
Page 35: ...Circuit Diagrams and PWB Layouts 35 EM1 1A AA 7 Layout LSP Top Side ...
Page 37: ...Circuit Diagrams and PWB Layouts 37 EM1 1A AA 7 Layout LSP Overview Bottom Side ...
Page 38: ...38 EM1 1A AA 7 Circuit Diagrams and PWB Layouts Layout LSP Part 1 Bottom Side ...
Page 39: ...Circuit Diagrams and PWB Layouts 39 EM1 1A AA 7 Layout LSP Part 2 Bottom Side ...
Page 40: ...40 EM1 1A AA 7 Circuit Diagrams and PWB Layouts Layout LSP Part 3 Bottom Side ...
Page 41: ...Circuit Diagrams and PWB Layouts 41 EM1 1A AA 7 Layout LSP Part 4 Bottom Side ...
Page 116: ...116 EM1 1A AA 7 Circuit Diagrams and PWB Layouts Personal Notes E_06532_013 eps 131004 ...
