參數(shù)資料
型號(hào)： 9412AVK
廠商： MICRONAS SEMICONDUCTOR HOLDING AG
元件分類(lèi)： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP80
封裝： 14 X 14 MM, 2 MM HEIGHT, PLASTIC, MS-022, MQFP-80
文件頁(yè)數(shù)： 44/126頁(yè)
文件大小： 1673K
代理商： 9412AVK
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DATA SHEET
24
Aug. 16, 2004; 6251-552-1DS
Micronas
2.5. Display Processing
The display processing part contains an integrated tri-
ple 9-bit DAC and performs digital enhancements and
manipulations of the digital video component signal.
Fig. 2–35 shows the block diagram of the display pro-
cessing part.
2.5.1. Peaking
The luminance peaking filter improves the overall fre-
quency response of the luminance channel. It consists
of two filters working in parallel. They have high pass
(HP) and band pass (BP) characteristics. Their gain
factors are programmable separately (BCOF, HCOF).
Values greater than 4 peak the signal, whereas values
less than 4 attenuate the signal. The high pass and the
band pass filters are equipped with a common coring
algorithm. It is optimized to achieve a smooth display
of grey scales, not to improve the signal-to-noise ratio.
Therefore no artifacts are produced. Coring can be
switched off (YCOR). The Fig. 2–34 shows the block
diagram of the peaking block.
The peaking filter clock frequency is CLKB36=36 MHz
(27 MHz). The maximum signal frequency of the pic-
ture stored in the memory is 6.75 MHz. Due to a peak-
ing after postscaler, the frequency range of the peak-
ing filter varies with the expansion factor of the
postscaler.
Fig. 2–33: Peaking Filter: Bandpass and Highpass
filter
Fig. 2–34: Block Diagram Peaking
Fig. 2–35: Block Diagram of Display Processing
0
0.1
0.2
0.3
0.4
0.5
5
0
5
10
15
Peaking filter characteristic
normalized Frequency (B)
ga
in
[d
B]
BCOF
HCOF
BP
HP
GAINB
GAINH
Peak_in
Peak_out
AP
coring
DAC
DCTI
ayout
auout
avout
Peaking
Fine
Delay
4:4:4
Delay
Yin
Y
U
V
Coarse
Delay
DAC
ITU656
Encoder
656out
Cin
YCOR,
HCOF,
BCOF
THRESHC,
ASCENTCTI
FINEDEL
COARSEDEL
SHIFTUV,
DPOUT656
CHROMAMP
PKLY,
PKLU,
PKLV,
656clk
8
9402/9432 only
8:8:8
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