Circuit Descriptions, Abbreviation List, and IC Data Sheets
EN 68
LC4.2E AA
9.
9.6
Video: TV Part (diagrams A1, A2, and A3)
Figure 9-2 Block diagram video processing
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 trough 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 LCD monitors and televisions
incorporating Picture in Picture, up to SXGA output resolutions.
The Scaler controls the display processing in an LCD TV, 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.
1302
+5VSW
6,7
9
1
11
TV
FM
+VTUN
Sound
Traps
VIF1
VIF2
RF_AGC
VSIF2
VSIF1
24
25
31
29
30
7011 - IF
A 4
QSS Mixer/
AM Demod.
AV3
SVHS 2
SIDE AV
C
Y
VIDEO
20
21
20
21
SCART 2
SCART 1
B-In
Status
G-In
R-In
FBL-In
TER-Out
CVBS-In
5
5
6
6
7
7
9
9
10
Status
P50
C-In
MON-Out
Y/CVBS-In
10
15
15
16
16
EF
7119
SC1_COMP_R_V_IN
SC1_FBL_IN
QSS/FM
AGC
Detect
CVBS1
Input
sw.
INA..D
cvbs/y
c
Output
sw.
CS1A..D
cvbs
+
55
58
51
59
52
64
1328
1330
7
7
8
8
3311
2
3
2
2321
4327
4331
4333
Dig. 2H/4H
Combfilter
Y Delay Adj.
PAL/NTSC/
SECAM
Decoder &
Baseband
Delay
Y
int
Chroma
U
int
V
int
RGB/YP
R
P
B
Insert
YUV Interface
78
79
80
77
74
75
76
Pix Improvement
(Histogram)
7560
70
71
72
Peaking
SCAVEM
U/V Delay
YUV IN/OUT
Skin Tone
U/V Tint
Saturation
RGB Matrix
Blue & Black
Stretch
Gamma Corr.
YUV
SAT
SCAVEM
on Text
RGB Matrix
Blue & Black
Stretch
Gamma Corr.
G_OSD
R_OSD
B_OSD
F
a
st Blanking
CON
BRI
85
86
87
H/V
Sync Sep
H-OSC
H-Shift
H-Drive
Vertical & East-
West Geometry
H/V
66
67
HOUT
FB/SC
VDRB
VDRA
23
22
YO
U
T
UOUT
VO
U
T
VIN
UIN
YIN
R/Pr-3
INSSW3
G/Y3
B/Pb-3
SC1_COMP_AV1_G_Y_CVBS_IN
SC1_COMP_B_U_IN
EF
7013
EF
7014
EF
7012
RO
GO
BO
R_SDTV
G_SDTV
B_SDTV
SCL
SD
A
6
8
9
16
17
19
14
11
7138
A 3
SC2_C_IN
SC2_CVBS_MON_OUT
SC1_CVBS_IN
SC2_Y_IN
SVHS_AV2_Y_CVBS_IN
SVHS_C_IN
cvbs/y
CVBS/Y
-X
C-X
CVBS/Y-X
C-X
P50
STATUS_2
STATUS_1
AM
SC2_CVBS_RF_OUT
43
VCC
TR
DISC
CTRL
RES
OUT
THR
2028
7018
3021
2062
7016#
VCC
TR
DISC
CTRL
RES
OUT
THR
2021
3057
2042
7015#
VCC
TR
DISC
CTRL
RES
OUT
THR
2045
3025
2034
7017#
2020
H_CS_SDTV
7019
2022
V_SDTV
SANDCASTLE
+5VSW
+5VSW
# = NE555 TIMER
8
2
4
3
5
7
6
8
2
4
3
7
6
8
2
4
3
6
7
5
5
3010
3058
SANDCASTLE
1
A 2
A13
A13
A13
A13
A13
A2
A2
SYSTEM
7011
PAL-MULTI/SECAM
TDA12021
NTSC
TDA12001
CHINA/NTSC-AP
TDA12011
EF
E_14490_103.eps
030804