Dnr Block Offset Control; Sd Active Video Edge Control - Analog Devices ADV8005 Hardware Reference Manual

ADV8005 Hardware Reference Manual
7.4.19.8.

DNR Block Offset Control

blk_offset[3:0] allows a shift of the data block of 15 pixels maximum. The coring gain positions are fixed. The block offset shifts the data in steps
of one pixel so that the border coring gain factors can be applied at the same position regardless of variations in input timing of the data.
blk_offset[3:0], Encoder Map, Address 0xE4A5[7:4]
This signal is used to configure the Digital Noise Reduction (DNR) block offset.
Function
blk_offset[3:0]
0000 (default)
0001
1110
1111
7.4.19.9.

SD Active Video Edge Control

The ADV8005 encoder core is able to control fast rising and falling signals at the start and end of active video in order to minimize ringing
artifacts.
When the active video edge control feature is enabled, the first three pixels and the last three pixels of the active video on the luma channel are
scaled so that maximum transitions on these pixels are not possible. This feature is highlighted in
At the start of active video, the first three pixels are multiplied by 1/8, 1/2, and 7/8, respectively. Approaching the end of active video, the last
three pixels are multiplied by 7/8, 1/2, and 1/8, respectively. All other active video pixels pass through unprocessed.
show the difference between having this feature enabled and disabled. This feature can be enabled using slope_en.
Description
0 pixel offset
One pixel offset
...
14 pixel offset
15 pixel offset
LUMA CHANNEL WITH
ACTIVE VIDEO EDGE
DISABLED
100 IRE
0 IRE
Figure 131: Example of Active Video Edge Functionality
VOLTS IRE:FLT
100
0.5
50
0
0
–50
0 2 4
Figure 132: Example of Video Output with SD Active Video Edge Control Disabled
LUMA CHANNEL WITH
ACTIVE VIDEO EDGE
ENABLED
100 IRE
87.5 IRE
50 IRE
12.5 IRE
0 IRE
F2
L135
6 8
Rev. A | Page 275 of 317
Figure 131.
Figure 132
10 12
UG-707
and Figure 133