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參數(shù)資料
| 型號： | VDP31XXB |
| 廠商： | MICRONAS SEMICONDUCTOR HOLDING AG |
| 英文描述： | Video Processor Family |
| 中文描述： | 視頻處理器系列 |
| 文件頁數(shù)： | 10/72頁 |
| 文件大?。?/td> | 597K |
| 代理商： | VDP31XXB |
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VDP 31xxB
PRELIMINARY DATA SHEET
10
Micronas
2.3. Color Decoder
In this block, the standard luma/chroma separation and
multi-standard color demodulation is carried out. The
color demodulation uses an asynchronous clock, thus
allowing a unified architecture for all color standards.
A block diagram of the color decoder is shown in Fig.
2
–
5. The luma as well as the chroma processing, is
shown here. The color decoder provides also some spe-
cial modes, e.g. wide band chroma format which is in-
tended for S-VHS wide bandwidth chroma.
If the adaptive comb filter is used for luma chroma sepa-
ration, the color decoder uses the S-VHS mode proces-
sing. The output of the color decoder is YC
r
C
b
in a 4:2:2
format.
2.3.1. IF-Compensation
With off-air or mistuned reception, any attenuation at
higher frequencies or asymmetry around the color sub-
carrier is compensated. Four different settings of the IF-
compensation are possible:
–
flat (no compensation)
–
6 dB/octave
–
12 dB/octave
–
10 dB/MHz
The last setting gives a very large boost to high frequen-
cies. It is provided for SECAM signals that are decoded
using a SAW filter specified originally for the PAL stan-
dard.
Fig. 2
–
4:
Frequency response of chroma
IF-compensation
Chroma
IF Compensation
DC-Reject
MIXER
Lowpass Filter
Phase/Freq
Demodulator
ACC
Color-PLL/Color-ACC
1 H Delay
M
M
Cross-Switch
Notch
Filter
Luma / CVBS
Luma
Fig. 2
–
5:
Color decoder
Chroma /C
r
C
b
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