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Pixel Phase
(SHORT CUT: Press
Pixel phase adjusts the phase of the pixel sampling clock relative to the incoming signal. It is
used primarily for adjusting RGB inputs.
NOTE: Adjust pixel phase after pixel tracking is properly set.
Adjust pixel phase when the image (usually from an RGB source) shows shimmer or "noise".
Pixel phase adjustment is done most effectively from within a proper test pattern, such as a
smooth gray consisting of a clear pattern of tiny black and white dots, or a similar graphic
image, such as the Display mate program. Adjust until the image is stable and each dot is clear-
ly defined. Using the numbers on the slidebar as a guide, you will notice that you can actually
stabilize the image at more than one point-i.e., you may find that the image appearance at "11"
is identical to the image appearance at "38", thus you can select either setting.
Filter
Filter applies a low pass filter to the input signal. This removes high frequencies which can
improve pixel phase noise but which also reduces signal bandwidth. Note that most signals will
not require any filter adjustment-use the filter option only if standard pixel tracking and phase
adjustments do not adequately clear up a "noisy" signal. For best results:
1. Optimize Pixel Tracking and jot down the value.
2. Optimize Pixel Phase
3. If the image is still too noisy, return to Pixel Tracking and
"mis-adjust" so that 2 vertical bands of noise appear, separat-
ed by a good center band. See right.
4. Adjust Filter to maximize the width of the good area. See
right.
5. Return Pixel Tracking to its correct setting from Step 1.
6. Readjust Phase.
NOTE: "Filter" affects only the current signal.
H-Position
(SHORT CUT: Press
This option moves picture right and left.
NOTE: The value shown represents where the approximate center of the image lies in relation
to the total number of pixels available horizontally. This varies widely according to the signal-
watch the image while adjusting.
V-Position
(SHORT CUT: Press
Pixel
and adjust the bottom slidebar.)
Position
and adjust the top slidebar.)
Position
and adjust the bottom slidebar
3-22
OPERATION
Good area
Noise
Noise
Enlarge good area
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