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參數(shù)資料
| 型號： | ADV7314KST |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 顏色信號轉換 |
| 英文描述： | Multiformat 216 MHz Video Encoder with Six NSV 14-Bit DACs |
| 中文描述： | COLOR SIGNAL ENCODER, PQFP64 |
| 封裝： | LEAD FREE, MS-026BCD, LQFP-64 |
| 文件頁數(shù)： | 54/84頁 |
| 文件大?。?/td> | 1069K |
| 代理商： | ADV7314KST |
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REV. 0
–54–
ADV7314
Block Size Control [Address 64h, Bit 7]
This bit is used to select the size of the data blocks to be processed.
Setting the block size control function to a Logic 1 defines a
16 pixel
￥
16 pixel data block; a Logic 0 defines an 8 pixel
￥
8 pixel data block, where one pixel refers to two clock cycles at
27 MHz.
DNR Input Select Control [Address 65h, Bit 2–0]
Three bits are assigned to select the filter that is applied to the
incoming Y data. The signal that lies in the pass band of the
selected filter is the signal that will be DNR processed. Figure 50
shows the filter responses selectable with this control.
FILTER C
FILTER B
FILTER A
FILTER D
FREQUENCY (Hz)
00
1
2
3
4
5
6
0.2
0.4
0.6
M
0.8
1.0
Figure 50. DNR Input Select
DNR Mode Control [Address 65h, Bit 4]
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 defining 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
that 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 is that the signal will be boosted
(similar to using extended SSAF filter).
Block Offset Control [Address 65h, Bits 7–4]
Four bits are assigned to this control, which allows a shift of the
data block of 15 pixels maximum. Consider the coring gain
positions fixed. 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.
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