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Circuit Descriptions, List of Abbreviations, and IC Data Sheets
9.3.7
Sound Trap Switching
Figure 9-14 Sound trap switching circuit
Composite video is output on pin 10 of 7323 and buffered by
transistor 7411. The signal is then applied to the 5.5 MHz trap,
1406. In the PAL/SECAM mode, the LMN line is Low, switching
transistor 7407 "on", causing the signal to bypass 1407, the 4.5
MHz filter. The video is then buffered by transistor 7322 before
being applied to pin 14 of 7323.
In the NTSC mode, the LMN line goes "high" and transistor
7406 turns "on", switching the 4.5 MHz SAW filter "on".
Transistor 7407 is turned "off".
9.3.9
Feature Box
1682
Y-PIP+MAIN-IN
U-PIP+MAIN-IN
V-PIP+MAIN-IN
HA50
VA50
SCL-F
SDA-F
E_15000_079.eps
E
7719
FM3
D
C
7717
B
FM2
6
23
AGC
PREFILTER
A/D
CLAMP
8
25
AGC
A/D
CLAMP
PREFILTER
9
26
AGC
A/D
CLAMP
PREFILTER
28
SYNC
PROCESSING
29
4
5
Figure 9-16 FBX block diagram
9.3.8
1fH Component Buffer Amplifiers
181004
Figure 9-15 Component (YPbPr) buffers
The Y signal is buffered by transistors 7800 and 7801. This is
an impedance matching and YPbPr to YUV circuit. This circuit
does not invert the signal. The Pb signal is amplified by 7802
and buffered by 7803. The Pr signal is amplified by 7804 and
buffered by 7805. The Pb and Pr signals are inverted.
16b
MP
16b
16b
MOTION
DE-INTERLACER
16b
ESTIMATOR
DYNAMIC
NOISE
MP
REDUCTION
MF
16b
7714
FM1
BUS C
TIME
NOISE
BASE
REDUCTION
CORRECTION
MUX
HISTOGRAM
MICROCONTROLLER CORE
7716
EPROM
DPTV565 AA
F
16b
TO
VERT
EAGLE
PEAK
G
16b
UP-
CONVERSION
7718
FALCONIC
SAA4992
TO EAGLE
12
BUS D
TRIPLE
TRIPLE
14
ANALOG
DAC
FILTER
15
18
19
7611
PROGRAM
PICNIC
ROM
SAA4978
E_15000_084.eps
181004
9.
EN 85
E_15000_080.eps
181004
NOT
USED
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