UG-707
ADV8005 Hardware Reference Manual
Rev. A | Page 274 of 317
dnr_mpeg_1
, Encoder Map,
Address 0xE4A4[7]
This bit is used to select the Digital Noise Reduction (DNR) block size.
Function
dnr_mpeg_1 Description
1 16
pixels
0 (default)
8 pixels
7.4.19.6.
DNR Input Select Control
is used to select the filter which is applied to the incoming Y data. The signal that lies in the pass band of the selected
filter is the signal that is DNR processed.
shows the filter responses selectable with this control.
Figure 130: SD DNR Input Filter Select
dnr_fmode_control[2:0]
, Encoder Map,
Address 0xE4A5[2:0]
This signal is used to configure the Digital Noise Reduction (DNR) input filter.
Function
dnr_fmode_control[2:0] Description
001 Filter
A
010 Filter
B
011 Filter
C
100 Filter
D
7.4.19.7.
DNR Mode Control
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 using
When
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).
dnr_enable_sharpness
, Encoder Map,
Address 0xE4A5[3]
This bit is used to select the Digital Noise Reduction (DNR) mode.
Function
dnr_enable_sharpness Description
0 (default)
DNR mode
1
DNR sharpness mode
FILTER C
FILTER B
FILTER A
FILTER D
FREQUENCY (MHz)
0
0.2
0.4
0.6
MA
G
N
IT
U
D
E
0.8
1.0
0
1
2
3
4
5
6
06
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