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參數(shù)資料
| 型號(hào)： | SDA9255 |
| 廠商： | SIEMENS AG |
| 英文描述： | SRC-Scan Rate Converter SDA9255 |
| 中文描述： | 鋼骨混凝土掃描頻率轉(zhuǎn)換器SDA9255 |
| 文件頁數(shù)： | 21/45頁 |
| 文件大?。?/td> | 225K |
| 代理商： | SDA9255 |
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SDA 9255
Semiconductor Group
19
1998-02-01
Figure 4
Block Diagram of Motion Detection for Noise Reduction
The input signals for the motion detection for noise reduction are the just incoming
luminance signal (YIN) and the already noise reduced luminance signal on one field
delay (DYIN). Both signals are fed to a subtractor, followed by a low pass filter. This filter
can be bypassed by setting the NRHF bit (
see description subaddress 08
H
, Bit 0
) to
’0’. The absolute value is calculated and given to a limiter block. The output signal is fed
to the threshold block, where the value is quantized by using the 3 threshold values
MDNRTH0, MDNRTH1 and MDNRTH2. The quantization characteristic of the threshold
block is shown by the following table and diagram.
Table 3
Quantization Table of MDFORNR
Input Value
0 ... (TH0 – 1)
TH0 ... (TH1 – 1)
TH1 ... (TH2 – 1)
TH2 ... 31
Output
0
1
2
3
Mode
Still
Quasi still
Quasi motion
Motion
+
-
Noise
Reduction
Memory
Field
YIN
DYIN
Filter
Low Pass
MUX
1
0
ABS
LIMITER
THRESHOLD
MUX
0
1
MDNRTH2
MDNRTH1
MDNRTH0
MDFORNR
NRHF
SNR
FNR
U
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