參數(shù)資料
型號(hào): VCT3801A
廠商: MICRONAS SEMICONDUCTOR HOLDING AG
英文描述: Video/Controller/Teletext IC Family
中文描述: 視頻/控制/圖文電視IC系列
文件頁數(shù): 13/172頁
文件大?。?/td> 2243K
代理商: VCT3801A
ADVANCE INFORMATION
VCT 38xxA
Micronas
13
2.4. 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.
2–3. The luma as well as the chroma processing, is
shown here. The color decoder provides also some
special modes, e.g. wide band chroma format which is
intended for S-VHS wide bandwidth chroma.
If the adaptive comb filter is used for luma chroma sep-
aration, the color decoder uses the S-VHS mode pro-
cessing. The output of the color decoder is YC
r
C
b
in a
4:2:2 format.
Fig. 2–3:
Color decoder
2.4.1. IF-Compensation
With off-air or mistuned reception, any attenuation at
higher frequencies or asymmetry around the color
subcarrier 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 fre-
quencies. It is provided for SECAM signals that are
decoded using a SAW filter specified originally for the
PAL standard.
Fig. 2–4:
Frequency response of chroma IF-com-
pensation
ColorPLL/ColorACC
1 H Delay
M
M
CrossSwitch
Notch
Filter
Luma / CVBS
Luma
Chroma
Mixer
Low-pass Filter
Phase/Freq
Demodulator
ACC
Chroma
IF Compensation
DC-Reject
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