3-9
ISS 506 Integration Seamless Switcher • Operation
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.
Similarly, if the vertical start adjustment is set to less than the amount of actual
blanking, the ISS 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 Vertical Start variable to shift the starting period vertically on the
screen. Adjust the Horizontal Start variable to shift the scaler’s starting point
horizontally on the screen.
If improperly adjusted, the output position variable can result in an image
similar to figure 3-5. The position adjustment 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.
Preview and Program Phase submenus
The Preview and Program Phase submenus display and let you set the pixel phase,
which is the timing of the digital scaler’s sampling. Sampling at the optimum pixel
phase results in a brighter scaled output.
Select the desired submenu. Rotate the Adjust [ knob while the Input format
submenu is active to select an input to configure. Rotate the Adjust { knob to set
the phase variable from 0 to 31. The default is 16.
Total Pixels submenu
The total pixels variable (RGB and progressive/HDTV component only) defines 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).
There are several methods to determine the correct value to use in the total pixels
variable. Usually, the best method is to use the input signal specifications. For
some input sampling rates, the scaler’s setting can result in fine vertical lines
(figure 3-6).
Total Pixels
Active
Area
Blanking Area
Figure 3-6 — Incorrect total pixels variable
