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3-25IN1404XT Video Scaler and Switcher • Operation
Active Pixels
Total Pixels
Total
Lines
Active
Lines
Vertical
Blanking
Horizontal
Blanking
Active Area
Blanking Area
Figure 3-14 — Advanced input settings
• Horizontal blanking — Set from the Blanking submenu. The number of
pixels per line that are inside the blanking area to the left of the active area
(including the horizontal sync width and the horizontal back porch.
• Vertical blanking — Set from the Blanking submenu. The number of lines
per frame that are inside the blanking area above the active area (including
the vertical sync height and the vertical back porch).
• Total pixels (RGBHV/RGBS/RGsB, and progressive component only) — The
total number of pixels per line, including the blanking on both sides of the
input active area (active, horizontal sync width, back porch, and front porch).
The total number of lines per frame, including the blanking above and below
the active area is determined by the input signal and is not user adjustable.
Use these controls to match the input video signal and to frame the active area.
The active pixels and total pixels adjustments are interactive. Setting one of
these variables may require adjusting the other.
Input blanking adjustment
The input blanking controls adjust where the electronic scaling process takes effect.
The input blanking and active area should be manually adjusted, if necessary, to
match the input video signal, framing the active area of the input signal. If the
blanking is set incorrectly, the scaler may add blank borders on the leading edges
(top or left side) or it may crop the active area on the trailing edges (bottom or right
side).
Figure 3-15 shows an image that is improperly blanked (as indicated by the dashed
lines). If the horizontal blanking adjustment is set to less than the amount of actual
blanking, the IN1404XT starts scaling the input before the start of the active image.
This early scaling results in a blank border on the left side and cropping on the
right side, and looks as if the image is shifted to the right.