參數(shù)資料
型號(hào)： ADV7190
廠商： Analog Devices, Inc.
英文描述： Video Encoder with Six 10-Bit DACs and Video Encoder with Six DAC Outputs
中文描述： 視頻編碼器與六10位DAC和DAC的輸出6視頻編碼器
文件頁(yè)數(shù)： 41/69頁(yè)
文件大?。?/td> 628K
代理商： ADV7190
ADV7190/ADV7191
–41–
REV. 0
DNR2 BIT DESCRIPTION
DNR Input Select (DNR20–DNR22)
Three bits are assigned to select the
fi
lter which is applied to the
incoming Y data. The signal which lies in the passband of the
selected
fi
lter is the signal which will be DNR processed. Figure
81 shows the
fi
lter responses selectable with this control.
FREQUENCY
–
MHz
1
0.4
0.6
0.2
0
1
M
–
2
3
4
6
5
0.8
0
FILTER D
FILTER C
FILTER A
FILTER B
Figure 81. Filter Response of Filters Selectable
DNR Mode Control (DNR23)
This bit controls the DNR mode selected. A Logic 0 selects
DNR mode, a Logic 1 selects DNR Sharpness mode.
DNR works on the principle of de
fi
ning low amplitude, high-
frequency signals as probable noise and subtracting this noise
from the original signal.
In DNR mode, it is possible to subtract a fraction of the signal
which lies below the set threshold, assumed to be noise, from
the original signal. The threshold is set in DNR Register 1.
When DNR Sharpness mode is enabled it is possible to add a
fraction of the signal that lies above the set threshold to the
original signal, since this data is assumed to be valid data and
not noise. The overall effect being that the signal will be boosted
(similar to using Extended SSAF Filter).
FILTER OUTPUT
< THRESHOLD
GAIN CONTROL
BLOCK SIZE CONTROL
BORDER AREA
BLOCK OFFSET
GAIN
CORING GAIN DATA
CORING GAIN BORDER
FILTER BLOCK
FILTER OUTPUT
> THRESHOLD
DNR
OUT
MAIN SIGNAL PATH
Y DATA
INPUT
NOISE SIGNAL PATH
SUBTRACT
SIGNAL IN
THRESHOLD
RANGE
FROM
ORIGINAL
SIGNAL
DNR
MODE
FILTER OUTPUT
> THRESHOLD
GAIN CONTROL
BLOCK SIZE CONTROL
BORDER AREA
BLOCK OFFSET
GAIN
CORING GAIN DATA
CORING GAIN BORDER
FILTER BLOCK
FILTER OUTPUT
< THRESHOLD
DNR
OUT
MAIN SIGNAL PATH
Y DATA
INPUT
NOISE SIGNAL PATH
ADD
SIGNAL
ABOVE
THRESHOLD
RANGE
TO
ORIGINAL
SIGNAL
DNR
SHARPNESS
MODE
Figure 82. Block Diagram for DNR Mode and DNR Sharp-
ness Mode
Block Offset (DNR24–DNR27)
Four bits are assigned to this control which allows a shift of the
data block of 15 pixels maximum. Consider the coring gain po-
sitions
fi
xed. The block offset shifts the data in steps of one pixel
such that the border coring gain factors can be applied at the same
position regardless of variations in input timing of the data.
O X X X X X X O O X X X X X X O
APPLY DATA
CORING GAIN
APPLY BORDER
CORING GAIN
OFFSET
CAUSED BY
VARIATIONS IN
INPUT TIMING
DNR27
–
DNR24
= 01 HEX
O X X X X X X O O X X X X X X O
O X X X X X X O O X X X X X X O
Figure 83. DNR27–DNR24, Block Offset Control
DNR17
DNR16
DNR15
DNR14
DNR13
DNR12
DNR11
DNR10
DNR THRESHOLD
DNR DNR DNR DNR DNR DNR
15 14 13 12 11 10
0 0
0
0
0
0
1
1
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
62
63
0
1
2 PIXELS
4 PIXELS
DNR16
BORDER AREA
0
1
8 PIXELS
16 PIXELS
DNR17
BLOCK SIZE
CONTROL
Figure 80. DNR Register 1
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