Toshiba TLP510E Руководство по техническому обучению - Страница 35

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7-3-4. Color Signal Process Circuit
The color signal is level adjusted in the ACC (automatic
color control) circuit, corrected in passing through a
band pass circuit in the NTSC/PAL system, or a bell filter
correction is carried out in the SECAM system, and then
enters the color demodulation circuit.
The input burst signal is locked with a crystal oscillator
frequency (3.58 MHz/4.43 MHz) in the PLL circuit and
then demodulated into color difference signals after a
tint adjustment (in the NTSC system). The demodulation
for the SECAM signal is carried out using a PLL circuit.
The demodulated color difference signals are output
through low pass filters, delayed by 1H in passing
through TDA4665T, fed to TDA9141 again and directly
output.
7-3-5. Picture Sharpness Correction Circuit
The picture sharpness is carried out by QV007,
TDA4672. Fig. 7-3-8 shows the pin configuration of
TDA4672 and Fig. 7-3-9 shows the block diagram.
Picture sharpness correction frequency is set to 2.6 MHz.
V
1
P
C
2
DL
V
3
i(R-Y)
V
o(R-Y)
4
N.C.
5
V
o(R-Y)
6
V
7
i(B-Y)
8
GND2
9
SDA
Fig. 7-3-8 Pin configuration of TDA4672
Table 7-3-3 Terminal function of TDA4672
Pin
Name
No.
1
V
Positive power supply
P
2
C
Capacitor for delay time control
DL
3
V
± (R–Y) color difference input signal
i(R–Y)
4
V
± (R–Y) color difference output signal
o(R–Y)
5
N.C.
Not used
6
V
± (B–Y) color difference output signal
o(B–Y)
7
V
± (B–Y) color difference input signal
i(B–Y)
8
GND2
GND 2 (0V)
2
9
SDA
I
C bus data line
2
10
SCL
I
C bus clock line
11
C
Magnetic core capacitor
COR
12
V
Delay luminance output signal
o(Y)
13
C
Black level clamp capacitor 1
CLP1
14
C
Black level clamp capacitor 2
CLP2
15
C
Reference voltage capacitor
REF
16
V
Luminance input signal
i(Y)
17
SAND
Sandcastle pulse input
18
GND1
GND 1 (0V)
7-8
MED757
18
GND1
17
SAND
V
16
i(Y)
C
15
REF
C
14
TDA4672
CLP2
C
13
CLP1
V
12
o(Y)
C
11
COR
10
SCL
Function