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參數資料
| 型號： | LC749870LG |
| 廠商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PBGA64 |
| 封裝： | 5 X 5 MM, FLGA-64 |
| 文件頁數： | 30/44頁 |
| 文件大小： | 538K |
| 代理商： | LC749870LG |
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LC749870LG
No.A1765-36/44
10. Chrominance Signal Processing
In chrominance signal processing, U/V axial demodulation is performed on the carrier chrominance signal after Y/C
separation, and the UV signal is output.
1) ACC (Auto Color Control)
ACC maintains a constant carrier chrominance signal amplitude for NTSC and PAL. The amplitude is kept constant by
observing the color burst amplitude of the input carrier chrominance signal, and controlling the amplifier according to
the amplitude level. It can also turn on the color killer when the color burst amplitude is small. I2BAC_ACC_ON
switches between ACC ON and OFF.
2) Color Killer
The color killer masks the carrier chrominance signal so that a monochrome image is output. When entering the
detection results from APC or ACC circuits or an incompatible signal, the color killer is turned on and off. The color
killer can be set using I2BAC_CKILL_ON.
3) NTSC/PAL Color Decoder
The NTSC/PAL color decoder demodulates the carrier chrominance signal into color component signals (U/V).
Color Demodulator and Low Pass Filter
The Cb/Cr signal is demodulated by multiplying the chrominance signal and phase-controlled color sub-carrier
(4Fsc). Fig. 9 shows the block diagram.
Fig.9 Color Demodulator
The LPF characteristics after demodulation is shown in Fig.10.
Fig.10 LPF Characteristics after Demodulation
LPF
×
Chrominance
signal
Color sub-carrier
10
Cb/Cr
signal
-60
-50
-40
-30
-20
-10
0
10
0123456
7
Frequency[MHz]
M
agn
itu
d
e
[dB]
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