參數(shù)資料
型號： 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)： 19/172頁
文件大?。?/td> 2243K
代理商： VCT3801A
ADVANCE INFORMATION
VCT 38xxA
Micronas
19
Fig. 2–12:
Black-level expansion
a) luminance input
b) luminance input and output
2.10.3.Dynamic Peaking
Especially with decoded composite signals and notch
filter luminance separation, as input signals, it is nec-
essary to improve the luminance frequency character-
istics. With transparent, high-bandwidth signals, it is
sometimes desirable to soften the image.
In the VCT 38xxA, the luma response is improved by
‘dynamic’ peaking. The algorithm has been optimized
regarding step and frequency response. It adapts to
the amplitude of the high-frequency part. Small AC
amplitudes are processed, while large AC amplitudes
stay nearly unmodified.
The dynamic range can be adjusted from
14 to
+
14 dB for small high-frequency signals. There is sep-
arate adjustment for signal overshoot and for signal
undershoot. For large signals, the dynamic range is
limited by a non-linear function that does not create
any visible alias components. The peaking can be
switched over to “softening” by inverting the peaking
term by software.
The center frequency of the peaking filter is switchable
from 2.5 MHz to 3.2 MHz. For S-VHS and for notch filter
color decoding, the total system frequency responses
for both PAL and NTSC are shown in Fig. 2–14.
Transients, produced by the dynamic peaking when
switching video source signals, can be suppressed via
the priority bus.
Fig. 2–13:
Dynamic peaking frequency response
a)
b)
L
min
L
t
L
max
L
t
dB
MHz
20
5
–5
–10
–15
–20
0
2
4
6
8
10
15
10
0
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相關代理商/技術參數(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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