X75HD/X75SD Installation and Operation Manual 179
Chapter 10: Special Function Buttons
SD NR/Enhancement
The optional video noise and artifact reducer is based on Leitch's
AVARI (Advanced Video Artifact Reducer I) technology. This feature is
capable of impulse noise reduction, Gaussian random noise reduction,
compression blockiness and mosquito artifact reduction and the
sharpening and softening of images.
The impulse noise reducer is particularly effective in reducing satellite
noise. It automatically detects impulse noise and applies a median filter
when necessary. To achieve the ideal setting, adjust the Impulse Noise
Level control to reduce more impulse noise, but not to the extent that
excessive motion artifacts are generated.
AVARI technology uses a recursive 3D directional filter that reduces
Gaussian noise and compression artifacts, which includes the ability to
block artifacts and mosquito noise. For ideal effectiveness, adjust the
Noise/Artifact Level control up to see more effect on filtering, but not
to a level where excessive blurring is visible.
The directional softening/sharpening filter can be used in various
applications. For example, the softening filter can be used as a
compression pre-filter to reduce mosquito noise, and the sharpening
filter can be used to enhance picture appearance. The Soften/Sharpen
control provides this function; a negative value achieves a softening
effect, and a positive value results in a sharpening effect. While
adjusting these controls, the Split Screen feature may be used to
compare the filtered video against unfiltered video.
The overall filter delay is approximately 1 line when the Minimum
Delay parameter is set to Yes , and approximately 1 field when set to
No. The overall performance is slightly better when Minimum Delay is
set to No.
HD NR/Enhancement
The HD digital noise reduction and enhancement controls are included
as a standard feature with the HD submodule and may be applied to the
X75HD's HD outputs.
When equipped with the X75OPT-NR option, for the up-converted HD
output signal, you can use either (or both) of the SD or HD noise
reduction functions. To use the SD NR/Enhancement feature in this
case, set the SDNR Insert parameter to the appropriate SD video input
as described in the previous section.
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