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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(yè)數(shù)： | 15/172頁(yè) |
| 文件大?。?/td> | 2243K |
| 代理商： | VCT3801A |
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ADVANCE INFORMATION
VCT 38xxA
Micronas
15
2.4.7. Automatic Standard Recognition
The burst-frequency measurement is also used for
automatic standard recognition (together with the sta-
tus of horizontal and vertical locking) thus allowing a
completely independent search of the line and color
standard of the input signal. The following standards
can be distinguished:
PAL B,G,H,I; NTSC M; SECAM; NTSC 44; PAL M;
PAL N; PAL 60
For a preselection of allowed standards, the recogni-
tion can be enabled/disabled via I
2
C bus for each stan-
dard separately.
If at least one standard is enabled, the VCT 38xxA reg-
ularly checks the horizontal and vertical locking of the
input signal and the state of the color killer. If an error
exists for several adjacent fields a new standard
search is started. Depending on the measured line
number and burst frequency, the current standard is
selected.
For error handling the recognition algorithm delivers
the following status information:
– search active (busy)
– search terminated, but failed
– found standard is disabled
– vertical standard invalid
– no color found
2.4.8. PAL Compensation/1-H Comb Filter
The color decoder uses one fully integrated delay line.
Only active video is stored.
The delay line application depends on the color stan-
dard:
– NTSC:
1-H comb filter
or
color compensation
– PAL:
color compensation
– SECAM: crossover switch
In the NTSC compensated mode, (Fig. 2–6c), the color
signal is averaged for two adjacent lines. Thus,
cross-color distortion and chroma noise is reduced. In
the NTSC comb filter mode, (Fig. 2–6d), the delay line
is in the composite signal path, thus allowing reduction
of cross-color components, as well as cross-lumi-
nance. The loss of vertical resolution in the luminance
channel is compensated by adding the vertical detail
signal with removed color information.
Fig. 2–6:
NTSC color decoding options
Fig. 2–7:
PAL color decoding options
Fig. 2–8:
SECAM color decoding
chroma
filter
8
Chroma
CVBS
Y
1 H
8
CVBS
Chroma
filter
Y
8
Chroma
Luma
Y
8
r b
r b
r b
filter
1 H
8
Chroma
CVBS
Y
r b
d) comb filter
c) compensated
a) conventional
b) S-VHS
Chroma
filter
1 H
8
Chroma
CVBS
Y
8
Chroma
Luma
Y
8
1 H
r b
r b
a) conventional
b) S-VHS
MUX
filter
1 H
8
Chroma
CVBS
Y
r b
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| VCU2133 | High-Speed coder/decoder IC |
| VCX2150A | Surface mount 15.88 mm SQ (.625 SQ) |
| VCX2154A | Surface mount 15.88 mm SQ (.625 SQ) |
| VCXO-105N | VCXO |
| VCXO-199 | VCXO |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| VCT3802A | 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Video/Controller/Teletext IC Family |
| VCT3803A | 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Video/Controller/Teletext IC Family |
| VCT3804A | 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Video/Controller/Teletext IC Family |
| VCT3811A | 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Video/Controller/Teletext IC Family |
| VCT3831A | 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Video/Controller/Teletext IC Family |
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