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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.

i(R-Y)

o(R-Y)

N.C.

o(R-Y)

i(B-Y)

GND2

SDA

Fig. 7-3-8 Pin configuration of TDA4672

Table 7-3-3 Terminal function of TDA4672

Name

No.

Positive power supply

Capacitor for delay time control

± (R–Y) color difference input signal

i(R–Y)

± (R–Y) color difference output signal

o(R–Y)

N.C.

Not used

± (B–Y) color difference output signal

o(B–Y)

± (B–Y) color difference input signal

i(B–Y)

GND2

GND 2 (0V)

SDA

C bus data line

SCL

C bus clock line

Magnetic core capacitor

COR

Delay luminance output signal

o(Y)

Black level clamp capacitor 1

CLP1

Black level clamp capacitor 2

CLP2

Reference voltage capacitor

REF

Luminance input signal

i(Y)

SAND

Sandcastle pulse input

GND1

GND 1 (0V)

7-8

MED757