Extron Electronics IN1508 User Guide - Manual (Page 47)

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 32 shows an image that has incorrect horizontal and vertical start settings (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 right.
Vertical
Start
Horizontal
Start
Active Area
Blanking Area
Portion of input being sampled by the IN108
Portion of input
lost due to
incorrect H/V
start settings
Figure 32. Incorrect horizontal and vertical start settings
Similarly, if the vertical start adjustment is set to less than the amount of actual blanking, the
IN1508 starts scaling before the first line of the active image. This early scaling results in a
blank border on the top and cropping on the bottom, and looks as if the image is shifted
down.
Adjust the H Start status indicator bar to shift the starting point of the image horizontally on
the screen. Adjust the V Start status indicator bar to shift the starting period vertically on the
screen.
If improperly adjusted, the output position variable can result in an image similar to
figure 32. But, position only moves the image on the monitor. It does not add blank borders
or crop any part of the image. However, the apparent effect of blank borders and a cropped
image can be caused by the image being improperly positioned on the monitor.
IN1508 • Operation 42