ADV7390/ADV7391/ADV7392/ADV7393
Coring Gain Border—Subaddress 0xA3, Bits[3:0]
Block Size—Subaddress 0xA4, Bit 7
These four bits are assigned to the gain factor applied to border
areas. In DNR mode, the range of gain values is 0 to 1 in
increments of 1/8. This factor is applied to the DNR filter
output that lies below the set threshold range. The result is then
subtracted from the original signal.
This bit is used to select the size of the data blocks to be
processed. Setting the block size control function to Logic 1
defines a 16 pixel × 16 pixel data block, and Logic 0 defines an
8 pixel × 8 pixel data block, where one pixel refers to two clock
cycles at 27 MHz.
In DNR sharpness mode, the range of gain values is 0 to 0.5 in
increments of 1/16. This factor is applied to the DNR filter
output that lies above the threshold range. The result is added to
the original signal.
DNR Input Select—Subaddress 0xA5, Bits[2:0]
These 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 processed by DNR. Figure 82 shows
the filter responses selectable with this control.
Coring Gain Data—Subaddress 0xA3, Bits[7:4]
These four bits are assigned to the gain factor applied to the luma
data inside the MPEG pixel block. In DNR mode, the range of
gain values is 0 to 1 in increments of 1/8. This factor is applied
to the DNR filter output that lies below the set threshold range.
The result is then subtracted from the original signal.
1.0
FILTER D
0.8
FILTER C
0.6
In DNR sharpness mode, the range of gain values is 0 to 0.5 in
increments of 1/16. This factor is applied to the DNR filter
output that lies above the threshold range. The result is added to
the original signal.
0.4
0.2
0
FILTER B
APPLY DATA
APPLY BORDER
FILTER A
CORING GAIN CORING GAIN
O X X X X X X O O X X X X X X O
1
2
3
0
4
5
6
FREQUENCY (MHz)
OFFSET CAUSED
BY VARIATIONS IN
INPUT TIMING
O X X X X X X O O X X X X X X O
Figure 82. SD DNR Input Select
DNR Mode—Subaddress 0xA5, Bit 4
DNR27 TO DNR24 = 0x01 O X X X X X X O O X X X X X X O
This bit controls the DNR mode selected. Logic 0 selects DNR
mode; Logic 1 selects DNR sharpness mode.
Figure 80. SD DNR Offset Control
DNR Threshold—Subaddress 0xA4, Bits[5:0]
DNR works on the principle of defining low amplitude, high
frequency signals as probable noise and subtracting this noise
from the original signal.
These six bits are used to define the threshold value in the range
of 0 to 63. The range is an absolute value.
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.
Border Area—Subaddress 0xA4, Bit 6
When this bit is set to Logic 1, the block transition area can be
defined to consist of four pixels. If this bit is set to Logic 0, the
border transition area consists of two pixels, where one pixel
refers to two clock cycles at 27 MHz.
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 because this data is assumed to be valid data and
not noise. The overall effect is that the signal is boosted (similar
to using the extended SSAF filter).
720 × 485 PIXELS
2-PIXEL
(NTSC)
BORDER
DATA
Block Offset Control—Subaddress 0xA5, Bits[7:4]
Four bits are assigned to this control that allows a shift in the
data block of 15 pixels maximum. The coring gain positions are
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.
8 × 8 PIXEL BLOCK 8 × 8 PIXEL BLOCK
Figure 81. SD DNR Border Area
Rev. 0 | Page 58 of 96
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