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參數(shù)資料
| 型號： | VDP3108 |
| 廠商： | MICRONAS SEMICONDUCTOR HOLDING AG |
| 英文描述： | Single-Chip Video Processor |
| 中文描述： | 單芯片視頻處理器 |
| 文件頁數(shù)： | 16/61頁 |
| 文件大小： | 2638K |
| 代理商： | VDP3108 |
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VDP 3108
ADVANCE INFORMATION
MICRONAS INTERMETALL
16
2.4.4. Brightness Adjustment
The DC-level of the luminance signal can be adjusted by
–30 ... +100 % with 8 bit resolution. It is desirable to keep
a small offset with the signal to prevent undershoots
from the peaking from being cut. The brightness adjust-
ment is separate for main and side picture.
2.4.5. Soft Limiter
The dynamic range of the processed luma signal must
be limited to prevent the CRT from overload. An appro-
priate headroom for contrast, peaking and brightness
can be adjusted by the manufacturer according to the
CRT-characteristic. All signals higher than above this
limit will be ‘soft’-clipped. The soft limiter can support or
even replace an analog beam current limiter. Aliasing
due to signal limitation is avoided by using a filterbank
with individual limiter circuits.
A block diagram of the soft limiter is shown in figure
2–19. The signal is split into high and low frequency
bands. The low frequency part represents the average
picture level; if the average level is too high the picture
tube will overheat and produce coloration. The high fre-
quency part represents the peak picture level which can
be considerably higher than the average picture level.
Due to this characteristic of the picture tube, both com-
ponents are treated individually and are later recom-
bined. For the low frequency band a limiter with adjust-
able threshold is used. The high frequency components
produced in the limiter are below the nyquist frequency,
therefore no disturbing alias frequencies are generated.
For the high frequency band, the limiting is done by a
variable gain notch filter, effectively bounding the peak
to peak amplitude of the signal. In this way the signal is
limited without generating unwanted aliasing.
When the high and low frequency bands are added to-
gether again a second limiter sets the exact signal ampli-
tude range. The state of this limiter is used to control the
attenuation of the variable notch filter.
LPF
HPF
LIM1
LIM2
var. notch
IN
OUT
Loop
Filter
Fig. 2–19:
Block diagram of the soft limiter
2.4.6. Chroma Interpolation
A linear phase interpolator is used to convert the chroma
sampling rate from 10.125 MHz (4:2:2) to 20.25 MHz
(4:4:4). The frequency response of the interpolator is
shown in fig. 2–20. All further processing is carried out
at the full sampling rate.
dB
MHz
0
–10
–20
–30
–40
–50
0
2
4
6
8
10
Fig. 2–20:
Frequency response of the chroma
interpolation filter
2.4.7. Chroma Transient Improvement
The intention of this block is to enhance the chroma res-
olution. A correction signal is calculated by differenti-
ation of the color difference signals. The differentiation
can be adjusted according to the signal bandwidth, e.g.
for PAL/NTSC/SECAM or digital component signals re-
spectively. The amplitude of the correction signal is ad-
justable independently for the Cr/Cb signals. Small
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| VDP3108B | 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Video Processor Family |
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| VDP3112B | 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Video Processor Family |
| VDP3116B | 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Video Processor Family |
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