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3-35IN1508 Scaling Presentation Switcher • Operation
Horizontal Start and Vertical Start status indicator bars
The input start controls adjust where the electronic scaling process takes effect. The
input start 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 start is set
incorrectly, the switcher 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 3-24 shows an image that is improperly started (as indicated by the dashed
lines). If the horizontal start adjustment is set to less than the amount of actual
blanking, the IN1508 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.
V
ertical
Start
Horizontal
Start
Active Area
Active Blanking Area
Figure 3-24 — Incorrectly started image